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ECDFSNEW - Extended Chandra Deep Field South 250-ks Improved Point Source Catalog

HEASARC
Archive

Overview

This table contains the improved point-source catalog for the 250-ks Extended Chandra Deep Field-South (E-CDF-S) Survey, implementing a number of recent improvements in Chandra source-cataloguing methodology. For the E-CDF-S, the main catalog (entries from which are indicated with parameter values of source_sample = "Main" in this HEASARC representation) contains 1003 X-ray sources detected with wavdetect at a false-positive probability threshold of 10-5 that also satisfy a binomial-probability source-selection criterion of P < 0.002. Such an approach maximizes the number of reliable sources detected: a total of 275 main-catalog sources are new compared to the Lehmer et al. (2005, ApJS, 161, 21) E-CDF-S main catalog. The authors also provide an E-CDF-S supplementary catalog that consists of 56 sources (entries from which are indicated with parameter values of source_sample = "Supp" in this HEASARC representation) detected at the same wavdetect threshold and having P of 0.002-0.1 and Ks <= 22.3 mag counterparts. For all 1059 E-CDF-S sources, including the 318 newly detected ones (these being generally fainter and more obscured), the authors determine X-ray source positions utilizing centroid and matched-filter techniques; they also provide multi-wavelength identifications, apparent magnitudes of counterparts, spectroscopic and/or photometric redshifts, basic source classifications, and estimates of observed active galactic nucleus and galaxy source densities around respective field centers. Simulations show that the E-CDF-S main catalog is highly reliable and reasonably complete. Background and sensitivity analyses indicate that the on-axis mean flux limits reached represent a factor of ~1.5-2.0 improvement over the previous E-CDF-S limit.

The 250-ks E-CDF-S is composed of four distinct and contiguous ~ 250-ks Chandra pointings that flank the CDF-S proper, consisting of a total of nine separate observations taken between 2004 February 29 and November 20 (see Lehmer et al., 2005, ApJS, 161, 21 for more details).


Catalog Bibcode

2016ApJS..224...15X

References

The 2 Ms Chandra Deep Field-North survey and the 250 Ks Extended Chandra Deep
Field-South survey: improved point-source catalogs.
    Xue Y.Q., Luo B., Brandt W.N., Alexander D.M., Bauer F.E., Lehmer B.D.,
    Yang G.
   <Astrophys. J. Suppl. Ser., 224, 15-15 (2016)>
   =2016ApJS..224...15X    (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in August 2016 based on CDS Catalog J/ApJS/224/15 files table9.dat (the main source catalog) and table12.dat (the supplementary source catalog).

Parameters

Source_Sample
This HEASARC-created field indicates from which sample the entry was taken: "Main" if it comes from the main catalog (Table 9 in the published paper) of 1003 X-ray sources, or "Supp" if it comes from the supplementary catalog (Table 12 in the published paper) of 56 additional X-ray sources.

Source_Number
A sequential identification number for each source in the specified sample, "Main" or "Supp", in order of increasing J2000.0 RA. Thus, to uniquely specify a source both the source_sample and source_number values must be specified.

Name
The standard source designation in the style recommended by the Dictionary of Nomenclature of Celestial Objects for unregistered Chandra X-ray source, which was created by the HEASARC using the prefix 'CXOU' and the J2000.0 Right Ascension and Declination truncated to 0.1 seconds of time in RA and to 1 arcsecond in Declination.

RA
The Right Ascension of the best-fit X-ray source in the selected equinox. This was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table.

Dec
The Declination of the best-fit X-ray source in the selected equinox. This was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table.

LII
The Galactic Longitude of the best-fit X-ray source.

BII
The Galactic Latitude of the best-fit X-ray source.

Log_Prob_No_Src
The minimum value of log P among the three standard bands, where P is the binomial no-source probability as calculated by AE. More negative values of log P correspond to a source detection of higher significance. For sources with P = 0, the HEASARC has set log P = null (rather than -99.0 as in the original version). The authors find a median value of log P = -10.4 for the main-catalog sources, being much smaller than the main-catalog selection threshold value of log P < -2.7 (i.e., P < 0.002; see Section 3.3.1 of the reference paper).

Log_Prob_False_Pos
The logarithm of the minimum WAVDETECT false-positive probability detection threshold. The authors find that 650, 57, 102, and 194 of the main-catalog sources have minimum WAVDETECT probabilities (see footnote 20 of the reference paper) of 10-8, 10-7, 10-6, and 10-5, respectively (see Figure 34 of the reference paper).

Error_Radius
The X-ray positional uncertainty in units of arcseconds at the ~68% confidence level, which is computed utilizing Equation (2) in the reference paper, which is dependent on both the off-axis angle and the aperture-corrected net source counts. For the main-catalog sources, the positional uncertainty ranges from 0.10 to 1.30 arcseconds, with a median value of 0.63 arcseconds.

Off_Axis
The off-axis angle of each X-ray source, in units of arcminutes, that is the angular separation between the X-ray source and the average aim point given in Section 3.1 of the reference paper. For the main-catalog sources, the off-axis angle ranges from 0.18 to 12.22 arcminutes, with a median value of 5.47 arcminutes.

FB_Counts_Limit
This parameter is set to '<' if the source was not considered to be detected in the corresponding energy band, else is left blank.

FB_Counts
The aperture-corrected net (i.e., background-subtracted) source counts (or upper limit) for the standard full (0.5 - 7.0 keV) band. The authors treat a main-catalog source as being "detected" for photometry purposes in a given band only if it satisfies P < 0.002 in that band. They calculate upper limits for sources not detected in a given band, according to the Bayesian method of Kraft et al. (1991, ApJ, 374, 344) for a 90% confidence level, and the corresponding errors are set to null.

FB_Counts_Pos_Err
The 1-sigma upper statistical error (Gehrels 1986, ApJ, 303, 336) in the aperture-corrected net (i.e., background-subtracted) source counts in the specified band.

FB_Counts_Neg_Err
The 1-sigma lower statistical error (Gehrels 1986, ApJ, 303, 336) in the aperture-corrected net (i.e., background-subtracted) source counts in the specified band.

SB_Counts_Limit
This parameter is set to '<' if the source was not considered to be detected in the corresponding energy band, else is left blank.

SB_Counts
The aperture-corrected net (i.e., background-subtracted) source counts (or upper limit) for the standard soft (0.5 - 2.0 keV) band. The authors treat a main-catalog source as being "detected" for photometry purposes in a given band only if it satisfies P < 0.002 in that band. They calculate upper limits for sources not detected in a given band, according to the Bayesian method of Kraft et al. (1991, ApJ, 374, 344) for a 90% confidence level, and the corresponding errors are set to null.

SB_Counts_Pos_Err
The 1-sigma upper statistical error (Gehrels 1986, ApJ, 303, 336) in the aperture-corrected net (i.e., background-subtracted) source counts in the specified band.

SB_Counts_Neg_Err
The 1-sigma lower statistical error (Gehrels 1986, ApJ, 303, 336) in the aperture-corrected net (i.e., background-subtracted) source counts in the specified band.

HB_Counts_Limit
This parameter is set to '<' if the source was not considered to be detected in the corresponding energy band, else is left blank.

HB_Counts
The aperture-corrected net (i.e., background-subtracted) source counts (or upper limit) for the standard hard (2.0 - 7.0 keV) band. The authors treat a main-catalog source as being "detected" for photometry purposes in a given band only if it satisfies P < 0.002 in that band. They calculate upper limits for sources not detected in a given band, according to the Bayesian method of Kraft et al. (1991, ApJ, 374, 344) for a 90% confidence level, and the corresponding errors are set to null.

HB_Counts_Pos_Err
The 1-sigma upper statistical error (Gehrels 1986, ApJ, 303, 336) in the aperture-corrected net (i.e., background-subtracted) source counts in the specified band.

HB_Counts_Neg_Err
The 1-sigma lower statistical error (Gehrels 1986, ApJ, 303, 336) in the aperture-corrected net (i.e., background-subtracted) source counts in the specified band.

PSF_Flag
A flag indicating whether a source shows a radial profile consistent with that of the local PSF. Of the 1003 main-catalog sources, the authors find that all but 60 have radial profiles consistent with those of their corresponding PSFs above a 95% confidence level (thus being likely point-like sources), and set the value of this parameter to 1 for these sources. They then set the value of this parameter to 0 for the 60 inconsistent sources. These sources are located across the entire E-CDF-S field and show no pattern of spatial clustering. Furthermore, the authors visually inspected these 60 sources and do not find any significant signature of extension.

OIR_RA
The Right Ascension of the primary optical/near-IR/mid-IR/radio (ONIR) counterpart to the Chandra X-ray source in the selected equinox. For supplementary catalog source (entries with source_sample = "Supp"), the position of the TENIS WIRCam Ks-band source is adopted. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3.3 of the reference paper). Sources without ONIR counterparts have null values for this parameter. The ONIR counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table

OIR_Dec
The Declination of the primary optical/near-IR/mid-IR/radio (ONIR) counterpart to the Chandra X-ray source in the selected equinox. For supplementary catalog source (entries with source_sample = "Supp"), the position of the TENIS WIRCam Ks-band source is adopted. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3.3 of the reference paper). Sources without ONIR counterparts have null values for this parameter. The ONIR counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table.

Offset
The offset between the X-ray source and the primary ONIR counterpart positions, in units of arcseconds. Sources without ONIR counterparts have this parameter set to null.

OIR_Ctrpart_Mag
The AB magnitude of the primary ONIR counterpart in the counterpart-detection band. For supplementary catalog source (entries with source_sample = "Supp"), the magnitude of the WIRCam Ks-band source is adopted. Sources without ONIR counterparts have this parameter set to null. The radio AB magnitudes are converted from the radio flux densities fnu using m(AB) = -2.5*log(fnu) - 48.60.

OIR_Ctrpart_Catalog
The name of the ONIR catalog (i.e., VLA, GOODS-S, GEMS, CANDELS, MUSIC, TENIS, WFI, MUSYC, or SIMPLE; see Section 3.3.3 of the reference paper) in which the primary counterpart is found. Sources without ONIR counterparts have a blank value for this parameter.

VLA_RA
The Right Ascension of the VLA 1.4-GHz counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 16.9% of the main-catalog sources have VLA counterparts.

VLA_Dec
The Declination of the VLA 1.4-GHz counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 16.9% of the main-catalog sources have VLA counterparts.

VLA_Mag
The AB magnitude of the VLA 1.4-GHz counterpart to the Chandra X-ray source. Sources without such counterparts have this parameter set to null. The radio AB magnitudes are converted from the radio flux densities fnu using m(AB) = -2.5*log(fnu) - 48.60.

Goodss_RA
The Right Ascension of the GOODS-S z-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 13.3% of the main-catalog sources have GOODS-S counterparts.

Goodss_Dec
The Declination of the GOODS-S z-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 13.3% of the main-catalog sources have GOODS-S counterparts.

Goodss_Mag
The AB magnitude of the GOODS-S z-band counterpart to the Chandra X-ray source. Sources without such counterparts have this parameter set to null.

Gems_RA
The Right Ascension of the GEMS z-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 57.3% of the main-catalog sources have GEMS counterparts.

Gems_Dec
The Declination of the GEMS z-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 57.3% of the main-catalog sources have GEMS counterparts.

Gems_Mag
The AB magnitude of the GEMS z-band counterpart to the Chandra X-ray source. Sources without such counterparts have this parameter set to null.

Candels_RA
The Right Ascension of the CANDELS H-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 9.0% of the main-catalog sources have CANDELS counterparts.

Candels_Dec
The Declination of the CANDELS H-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 9.0% of the main-catalog sources have CANDELS counterparts.

Candels_Mag
The AB magnitude of the CANDELS H-band counterpart to the Chandra X-ray source. Sources without such counterparts have this parameter set to null.

Music_RA
The Right Ascension of the MUSIC K-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 9.3% of the main-catalog sources have MUSIC counterparts.

Music_Dec
The Declination of the MUSIC K-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 9.3% of the main-catalog sources have MUSIC counterparts.

Music_Mag
The AB magnitude of the MUSIC K-band counterpart to the Chandra X-ray source. Sources without such counterparts have this parameter set to null.

Tenis_RA
The Right Ascension of the TENIS Ks-band counterpart to the Chandra X-ray source in the selected equinox. Sources without counterparts have null values for this parameter. The counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 79.5% of the main-catalog sources have TENIS counterparts.

Tenis_Dec
The Declination of the TENIS Ks-band counterpart to the Chandra X-ray source in the selected equinox. Sources without counterparts have null values for this parameter. The counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 79.5% of the main-catalog sources have TENIS counterparts.

Tenis_Mag
The AB magnitude of the TENIS Ks-band counterpart to the Chandra X-ray source. Sources without such counterparts have this parameter set to null.

Wfi_RA
The Right Ascension of the WFI R-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 72.3% of the main-catalog sources have WFI counterparts.

Wfi_Dec
The Declination of the WFI R-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 72.3% of the main-catalog sources have WFI counterparts.

Wfi_Mag
The AB magnitude of the WFI R-band counterpart to the Chandra X-ray source. Sources without such counterparts have this parameter set to null.

Musyc_RA
The Right Ascension of the MUSYC K-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 59.4% of the main-catalog sources have MUSYC counterparts.

Musyc_Dec
The Declination of the MUSYC K-band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 59.4% of the main-catalog sources have MUSYC counterparts.

Musyc_Mag
The AB magnitude of the MUSYC K-band counterpart to the Chandra X-ray source. Sources without such counterparts have this parameter set to null.

Simple_RA
The Right Ascension of the SIMPLE 3.6-um band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 75.1% of the main-catalog sources have SIMPLE counterparts.

Simple_Dec
The Declination of the SIMPLE 3.6-um band counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table. The authors match the position of the primary ONIR counterpart with the nine ONIR catalogs using a matching radius of 0.5 arcseconds. They find that 75.1% of the main-catalog sources have SIMPLE counterparts.

Simple_Mag
The AB magnitude of the SIMPLE 3.6-micron band counterpart to the Chandra X-ray source. Sources without such counterparts have this parameter set to null.

Spec_Redshift
The spectroscopic redshift (zspec) of the source taken from the references coded in the ref_spec_redshift parameter. The authors match the positions of primary ONIR counterparts with the specified zspec catalogs utilizing a 0.5 arcseconds matching radius. For the 958 main-catalog sources with ONIR counterparts, they find that 476 (49.7%) have zspec measurements (384/476 = 80.7% have R <= 24 mag and 92/476 = 19.3% have R > 24 mag). 394 (82.8%) of these 476 zspec values are secure, being flagged as "Secure" in the spec_redshift_flag parameter; 82 (17.2%) of these 476 zspec values are insecure, being flagged as "Insecure". Sources without an available zspec value have been set to null values.

Spec_Redshift_Flag
This parameter contains a quality Flag for the quoted spectroscopic redshift" "None", "Secure" or "Insecure".

Ref_Spec_Redshift
The reference code for the spectroscopic redshift of the source, coded as follows:

   (1) Szokoly et al. (2004, ApJS, 155, 271),
   (2) Zheng et al. (2004, ApJS, 155, 73),
   (3) Ravikumar et al. (2007, A&A, 465, 1099),
   (4) Treister et al. (2009, ApJ, 693, 1713),
   (5) Balestra et al. (2010, A&A, 512, 12),
   (6) Silverman et al. (2010, ApJS, 191, 124),
   (7) Bonzini et al. (2012, ApJS, 203, 15),
   (8) Cooper et al. (2012, MNRAS, 425, 2116),
   (9) Coppin et al. (2012, MNRAS, 427, 520),
  (10) Georgantopoulos et al. (2013, A&A, 555, 43),
  (11) Le Fevre et al. (2013, A&A, 559, 14),
  (12) Taylor et al. (2009, ApJS, 183, 295),
  (13) Kriek et al. (2008, ApJ, 677, 219),
  (14) Hsu et al. (2014, ApJ, 796, 60),
  (15) Skelton et al. (2014, ApJS, 214, 24),
  (16) Luo et al. (2010, ApJS, 187, 560), and
  (17) Cardamone et al. (2010, ApJS, 189, 270).
  

Phot_Redshift
The photometric-redshift (zphot) information on the source taken from the CANDELS/GOODS-S, CDF-S, and E-CDF-S catalog of Hsu et al. (2014, ApJ, 796, 60). The authors match the position of primary ONIR counterparts with the zphot catalogs utilizing a 0.5 arcseconds matching radius. Of the 958 main-catalog sources with ONIR counterparts, 748 (78.1%) have zphot estimates from Hsu et al. (2014). Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Min
The 1-sigma lower bound to the photometric redshift (zphot) of the source taken from Hsu et al. (2014). Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Max
The 1-sigma upper bound to the photometric redshift (zphot) of the source taken from Hsu et al. (2014). Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Alt
An alternative photometric redshift taken from from the CANDELS/GOODS-S, CDF-S, and E-CDF-S catalog of Hsu et al. (2014, ApJ, 796, 60). The authors match the position of primary ONIR counterparts with the zphot catalogs utilizing a 0.5 arcseconds matching radius. Sources without available alternative zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Sk
An alternative photometric redshift taken from from the CANDELS/3D-HST zphot catalog of Skelton et al. (2014, ApJS, 214, 24). The authors match the position of primary ONIR counterparts with the zphot catalogs utilizing a 0.5 arcseconds matching radius. Of the 958 main-catalog sources with ONIR counterparts, 136 (14.2%) have zphot estimates from this reference. Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Sk_Min
The 1-sigma lower bound to the photometric redshift (zphot) of the source taken from Skelton et al. (2014, ApJS, 214, 24). Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Sk_Max
The 1-sigma upper bound to the photometric redshift (zphot) of the source taken from Skelton et al. (2014, ApJS, 214, 24). Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Sk_Flag
The value of the quality flag Qz for the Skelton et al. (2014) photometric redshift of the source. Smaller Qz values denote better quality, with 0 < Qz <~ 1 indicating a reliable zphot estimate.

Phot_Class_Sk
The likely photometric classification of the source ("Galaxy" or "Star") taken from Skelton et al. (2014).

Phot_Redshift_Lu1
The photometric redshift of the source taken from from Luo et al. (2010, ApJS, 187, 560). The authors match the position of primary ONIR counterparts with the zphot catalogs utilizing a 0.5 arcseconds matching radius. Of the 958 main-catalog sources with ONIR counterparts, 221 (23.1%) have zphot estimates from this reference. Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Lu1_Min
The 1-sigma lower bound to the photometric redshift (zphot) of the source taken from Luo et al. (2010, ApJS, 187, 560). Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Lu1_Max
The 1-sigma upper bound to the photometric redshift (zphot) of the source taken from Luo et al. (2010, ApJS, 187, 560). Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Lu2
An alternative photometric redshift of the source taken from from Luo et al. (2010, ApJS, 187, 560). Sources without available alternative zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Ca
The photometric redshift of the source taken from from Cardamone et al. (2010, ApJS, 189, 270). The authors match the position of primary ONIR counterparts with the zphot catalogs utilizing a 0.5 arcseconds matching radius. Of the 958 main-catalog sources with ONIR counterparts, 624 (65.1%) have zphot estimates from this reference. Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Ca_Min
The 1-sigma lower bound to the photometric redshift (zphot) of the source taken from Cardamone et al. (2010, ApJS, 189, 270). Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Ca_Max
The 1-sigma upper bound to the photometric redshift (zphot) of the source taken from Cardamone et al. (2010, ApJS, 189, 270). Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_Ca_Flag
The value of the quality flag Qz for the Cardamone et al. (2010) photometric redshift of the source. Smaller Qz values denote better quality, with 0 < Qz <~ 1 indicating a reliable zphot estimate.

Phot_Redshift_Ca_Si
The stellarity index SI of the source taken from Cardamone et al. (2010). This ranges from 0 to 1; a null value of indicates that this information is not available.

Phot_Redshift_Ca_Stp
A flag parameter taken from Cardamone et al. (2010) which indicates whether the source prefers the photometric fitting result using the stellar templates, where the values of 1, 0, and null indicate preferences for the stellar templates, not preferring the stellar templates, and this information not being available, respectively.

Phot_Redshift_RA
The photometric redshift of the source taken from Rafferty et al. (2011, ApJ, 742, 3). The authors match the position of primary ONIR counterparts with the zphot catalogs utilizing a 0.5 arcseconds matching radius. Of the 958 main-catalog sources with ONIR counterparts, 692 (72.2%) have zphot estimates from this reference. Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_RA_Min
The 1-sigma lower bound to the photometric redshift (zphot) of the source taken from Rafferty et al. (2011, ApJ, 742, 3). Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Redshift_RA_Max
The 1-sigma upper bound to the photometric redshift (zphot) of the source taken from Rafferty et al. (2011, ApJ, 742, 3). Sources without available zphot estimates from this reference have this parameter set to null.

Phot_Class_RA
The likely photometric classification ("Hybrid", "Galaxy" or "Star"), with the first indicating preferring a mixture of AGN and galaxy templates), from Rafferty et al. (2011).

Redshift
The preferred final redshift zfinal of the source adopted in this study. The authors choose zfinal for a source in the following order of preference: (1) secure zspec values; (2) insecure zspec values that are in agreement with any zphot estimates that are available [i.e., the absolute value of (zspec - z_phot)/(1 + zspec) <= 0.15]; (3) zphot values from Hsu et al. (2014); (4) zphot values from Skelton et al. (2014); (5) zphot values from Luo et al. (2010); (6) zphot values from Cardamone et al. (2010); (7) zphot values from Rafferty et al. (2011); and (8) insecure zspec values that are the only redshift information available (thus being unable to compare with any zphot estimate). Of the 958 main-catalog sources with ONIR counterparts, 810 (84.6%) have zspec or zphot estimated values.

L05_Source_Number
The corresponding source ID number in the Lehmer et al. (2005, ApJS, 161, 21, hereafter L05) E-CDF-S catalog (which is available in the HEASARC database as the ECDFSCXO table). The authors match their X-ray source positions to the L05 source positions (shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame) using a 2.5-arcsecond matching radius for sources having off-axis angles < 6 arcminutes and a 4.0-arcsecond matching radius for sources having off-axis angles >= 6 arcminutes. Among the 1003 main-catalog sources, they find that (1) 728 have matches in the 762-source L05 main catalog (the value of this parameter is that from Column 1 of Table 2 in L05), i.e., there are 275 (i.e., 1003 - 728 = 275) new main-catalog sources (see Section 3.3.7 of the reference paper for more details of these 275 new sources), compared to the L05 main catalog; (2) 21 have matches in the 33-source L05 supplementary catalog (the value of this parameter is that from Column 1 of Table 6 in L05 with a prefix of "SP_" added); and (3) 254 have no match in either the L05 main or supplementary catalogs, which are detected now thanks to the new two-stage source-detection approach (in such cases the value of this parameter is set to null). The authors refer readers to Section 3.3.5 of the reference paper for information on the 34 L05 main-catalog sources that are not included in the present "Main" catalog sample.

L05_RA
The Right Ascension of the L05 counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 2.3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table.

L05_Dec
The Declination of the L05 counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 2.3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table.

X11_Source_Number
The corresponding source ID number in the Xue et al. (2011, ApJS, 195, 10, hereafter X11) 4-Ms CDF-S catalog (which is available in the HEASARC database as the CHANDFS4MS table). Among the 1003 main-catalog sources, the authors find that (1) 273 have matches in the 740-source X11 main catalog (the value of this parameter is that from Column 1 of Table 3 in X11),(2) 12 have matches in the 36-source X11 supplementary catalog (the value of this parameter is that from Column 1 of Table 6 in X11 with a prefix of "SP_" added); and (3) 718 have no match in either the X11 main or supplementary catalogs, mainly due to their spatial locations being covered only by the 4-Ms CDF-S (in such cases the value of this parameter is set to null).

X11_RA
The Right Ascension of the X11 counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 2.3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart RA was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table.

X11_Dec
The Declination of the X11 counterpart to the Chandra X-ray source in the selected equinox. This position has been shifted accordingly to be consistent with the TENIS WIRCam Ks-band astrometric frame (see Section 2.3.3 of the reference paper). Sources without counterparts have null values for this parameter. The counterpart Declination was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table.

FB_Exposure
The effective exposure time at the position of the source in units of seconds derived from the exposure maps for the standard full (0.5 - 7.0 keV) band. Effective count rates that are corrected for effects of vignetting, quantum-efficiency degradation, and exposure time variations can be obtained by dividing the full-band counts (the fb_counts parameter) by this corresponding effective exposure time.

SB_Exposure
The effective exposure time at the position of the source in units of seconds derived from the exposure maps for the standard soft (0.5 - 2.0 keV) band. Effective count rates that are corrected for effects of vignetting, quantum-efficiency degradation, and exposure time variations can be obtained by dividing the soft-band counts (the sb_counts parameter) by this corresponding effective exposure time.

HB_Exposure
The effective exposure time at the position of the source in units of seconds derived from the exposure maps for the standard hard (2.0 - 7.0 keV) band. Effective count rates that are corrected for effects of vignetting, quantum-efficiency degradation, and exposure time variations can be obtained by dividing the hard-band counts (the hb_counts parameter) by this corresponding effective exposure time.

Band_Ratio
The band ratio of the Chandra source. The band ratio is defined as the ratio of effective count rates between the hard and soft bands. Band-ratio errors are computed according to the numerical error-propagation method detailed in Section 1.7.3 of Lyons (1991, Data Analysis for Physical Science Students), which avoids the failure of the standard approximate variance formula in the case of a small number of counts. Upper limits are computed for sources detected in the soft band but not the hard band, while lower limits are computed for sources detected in the hard band but not the soft band; for these sources, the upper and lower errors are set to the calculated band ratio. Band ratios and associated errors are set to null values for sources with full band detections only.

Band_Ratio_Pos_Err
The upper uncertainty in the band ratio.

Band_Ratio_Neg_Err
The lower uncertainty in the band ratio.

Photon_Index
The effective photon index Gamma of the Chandra X-ray source assuming a power-law model with the Galactic column density in the direction of the E-CDF-S NH of 8.8 x 1019 cm-2. Gamma is calculated based on the band ratio and a conversion between Gamma and the band ratio. This conversion is derived utilizing the band ratios and photon indices computed by the AE-automated XSPEC-fitting procedure for sources with > 200 full band counts. Upper limits are computed for sources detected in the hard band but not the soft band, while lower limits are computed for sources detected in the soft band but not the hard band; for these sources, the upper and lower errors are set to the calculated Gamma. A value of Gamma = 1.4 is assumed for low-count sources, being a representative value for faint sources that enables reasonable flux estimates, and the associated upper and lower errors are set to 0.00. Low-count sources are defined as those that were (1) detected in the soft band having < 30 counts and not detected in the hard band, (2) detected in the hard band having < 15 counts and not detected in the soft band, (3) detected in both the soft band and hard band, but having < 15 counts in each, or (4) detected only in the full band.

Photon_Index_Pos_Err
The upper uncertainty in the photon index of the Chandra X-ray source.

Photon_Index_Neg_Err
The lower uncertainty in the photon index of the Chandra X-ray source.

FB_Flux_Limit
This parameter is set to '<' if the source was not considered to be detected in the corresponding energy band, else is left blank.

FB_Flux
The observed-frame flux (or upper limit thereof) of the Chandra X-ray source, in units of erg cm-2 s-1, for the standard full band. Fluxes are calculated making use of the net counts and the effective exposure time in the corresponding band, and the photon index, Gamma, based on conversions derived from XSPEC-fitting results. Fluxes are not corrected for Galactic absorption or for any intrinsic absorption of the source.

SB_Flux_Limit
This parameter is set to '<' if the source was not considered to be detected in the corresponding energy band, else is left blank.

SB_Flux
The observed-frame flux (or upper limit thereof) of the Chandra X-ray source, in units of erg cm-2 s-1, for the standard soft band. Fluxes are calculated making use of the net counts and the effective exposure time in the corresponding band, and the photon index, Gamma, based on conversions derived from XSPEC-fitting results. Fluxes are not corrected for Galactic absorption or for any intrinsic absorption of the source.

HB_Flux_Limit
This parameter is set to '<' if the source was not considered to be detected in the corresponding energy band, else is left blank.

HB_Flux
The observed-frame flux (or upper limit thereof) of the Chandra X-ray source, in units of erg cm-2 s-1, for the standard hard band. Fluxes are calculated making use of the net counts and the effective exposure time in the corresponding band, and the photon index, Gamma, based on conversions derived from XSPEC-fitting results. Fluxes are not corrected for Galactic absorption or for any intrinsic absorption of the source.

Lx
A basic estimate of the absorption-corrected, rest-frame 0.5-7 keV luminosity Lx of the Chandra source, in units of erg s-1, computed according to the procedure presented in Section 3.4 of Xue et al. (2010, ApJ, 720, 368). A cosmology with H0 = 69.7 km s-1 Mpc-1, OmegaM = 0.282, and OmegaLambda = 0.718 (Hinshaw et al. 2013, ApJS, 208, 19) has been adopted. See Section 2.3.4 of the reference paper for more details. Sources without zfinal have this parameter set to null.

Broad_Type
A basic estimate of the likely source type: "AGN", "Galaxy", or "Star". A source is classified as an AGN once it satisfies at least one of the following four criteria (see Section 4.4 of Xue et al. (2011, ApJS. 195, 10) for reasoning and caveats):

     Lx >= 3 x 1042 erg s-1, i.e., luminous AGNs,

    Gamma <= 1.0, i.e., obscured AGNs,

    log (fx/fR) > -1, where fx is the full-, soft- or hard-band X-ray
                          flux and fR is the R-band flux, or

    Lx >~ 3 x (8.9 x 1017 LR), where LR is the rest-frame 1.4 GHz
                          monochromatic luminosity in units of W Hz-1.
  
A source is classified as a star if (1) it has zspec = 0, or (2) it has a photometric classification of "Star" in this paper, and is further confirmed through visual inspection of optical images. The authors also make use of additional spectroscopic and photometric data that are available in the CDF-S and E-CDF-S. The sources that are not classified as either AGNs or stars are then regarded as "Galaxies". There are 909 (90.6%), 67 (6.7%), and 27 (2.7%) of the 1003 main-catalog sources identified as AGNs, galaxies, and stars, respectively.

Note_Flag
This field contains brief notes on the sources. Sources in close doubles or triples are annotated with "C" (a total of 29 such sources), and sources lying at the field edge are annotated with "E" (only one such source), else it is left blank.

Class
The HEASARC Browse object classification based on the value of the broad_type parameter.


Contact Person

Questions regarding the ECDFSNEW database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 26-Aug-2016