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ELAISFBMC - European Large-Area ISO Survey (ELAIS) Final Band-Merged Catalog

HEASARC
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Overview

This table contains the final band-merged European Large-Area ISO Survey (ELAIS) Catalog at 6.7, 15, 90 and 175 microns (um), and the associated data at U, g', r', i', Z, J, H, K and 20 cm. The origin of the survey, infrared and radio observations, data-reduction and optical identifications are briefly reviewed in the reference paper, and a summary of the area covered and the completeness limit for each infrared band is given. A detailed discussion of the band-merging and optical association strategy is given in the paper. The total catalog consists of 3762 sources. 23% of the 15-um sources and 75% of the 6.7-um sources are stars. In the paper, for extragalactic sources observed in three or more infrared bands, color-color diagrams are presented and discussed in terms of the contributing infrared populations.

Spectroscopic redshifts are tabulated, where available. For the N1 and N2 areas, the Isaac Newton Telescope (INT) ugriz Wide Field Survey permits photometric redshifts to be estimated for galaxies and quasars. These agree well with the spectroscopic redshifts, within the uncertainty of the photometric method (~10% in (1 +z) for galaxies).

There is a high proportion of ultraluminous infrared galaxies (ULIRGs, with log10 of 1-1000 um luminosity Lir > 12.22) in the ELAIS Catalog (14% of 15-um galaxies with known z), many with Arp 220-like SEDs. 10% of the 15-um sources are genuine optically blank fields to r'= 24: these must have very high infrared-to-optical ratios and probably have z > 0.6, so are high-luminosity dusty starbursts or Type 2 AGN. Nine hyperluminous infrared galaxies (Lir > 13.22) and nine extremely red objects (EROs) (r-K > 6) are found in the survey. The latter are interpreted as ultraluminous dusty infrared galaxies at z ~ 1. The large numbers of ultraluminous galaxies imply very strong evolution in the star formation rate between z = 0 and 1. There is also a surprisingly large population of luminous (Lir > 11.5), cool (cirrus-type SEDs) galaxies, with Lir - Lopt > 0, implying AV > 1.

This table contains the total catalog of 3762 ELIAS band-merged sources.


Catalog Bibcode

2004MNRAS.351.1290R

References

The European Large-Area ISO Survey (ELAIS): the final band-merged catalogue.
    Rowan-Robinson M., Lari C., Perez-Fournon I., Gonzalez-Solares E.A.,
    Franca F.L., Vaccari M., Oliver S., Gruppioni C., Ciliegi P., Heraudeau P.,
    Serjeant S., Efstathiou A., Babbedge T., Matute I., Pozzi F.,
    Franceschini A., Vaisanen P., Afonso-Luis A., Alexander D.M., Almaini O.,
    Baker A.C., Basilakos S., Barden M., Del Burgo C., Bellas-Velidis I.,
    Cabrera-Guerra F., Carballo R., Cesarsky C.J., Clements D.L., Crockett H.,
    Danese L., Dapergolas A., Drolias B., Eaton N., Egami E., Elbaz D.,
    Fadda D., Fox M., Genzel R., Goldschmidt P., Gonzalez-Serrano J.I.,
    Graham M., Granato G.L., Hatziminaoglou E., Herbstmeier U., Joshi M.,
    Kontizas E., Kontizas M., Kotilainen J.K., Kunze D., Lawrence A., Lemke D.,
    Linden-Vornle M.J.D., Mann R.G., Marquez I., Masegosa J., Mcmahon R.G.,
    Miley G., Missoulis V., Mobasher B., Morel T., Norgaard-Nielsen H.,
    Omont A., Papadopoulos P., Puget J.-L., Rigopoulou D., Rocca-Volmerange B.,
    Sedgwick N., Silva L., Sumner T., Surace C., Vila-Vilaro B.,
    Van Der Werf P., Verma A., Vigroux L., Villar-Martin M., Willott C.J.,
    Carraminana A., Mujica R.
   <Mon. Not. R. Astron. Soc., 351, 1290-1306 (2004)>
   =2004MNRAS.351.1290R    (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in October 2012 based on CDS Catalog J/MNRAS/351/1290 files catalog.dat (3523 sources) and unassoc.dat (239 sources).

Parameters

Name
The ELAIS source designation of the merged source, named in order of preference for their detections at 15 um, 20 cm, 6.7 um, 90 um and 175 um, using the corresponding prefixes, their J2000.0 equatorial positions, and (in some cases) a suffix 'X' for composite sources, e.g., 'ELAISNNN JHHMMSS+DDMMSSX'. The string 'NNN' can have the following values:

  NNN         Meaning                     Wavelength Band

  C15         Camera 15-um                15 um
  R           Radio                       20 cm
  C7          Camera 7-um                 6.7 um
  P90         Preliminary 90-um           90 um
  
The character 'X' can have values of 'T' (for total source), or 'C' (for component C of a composite source). There are 4 sources detected only at 175 um which have a different naming convention, e.g., 'ELAIS-FIRBACK175 N2 014', ELAIS-FIRBACK175 N1 028', 'ELAIS-FIRBACK175 N1 022' and 'ELAIS-FIRBACK175 N1 027', where FIRBACK175 stands for 'Far-Infrared Background, 175 um', N1 and N2 are two of the ELAIS fields the properties of which are given in Table 1 of the reference paper, and the last digits are a source number.

Note that in the reference paper the prefix 'ELAISR20' was used rather than 'ELAISR'. The HEASARC has adopted the latter naming convention in compliance with the CDS Dictionary of Nomenclature of Celestial Objects recommendation.

RA
The Right Ascension of the ELAIS source in the selected equinox based on in order of preference their detections at 15 um, 20 cm, 6.7 um, 90 um and 175 um. This coordinate was given in J2000.0 coordinates to a precision of 0.0001 seconds of time in the original table. The 1-sigma positional uncertainties at 15-um and 20-cm have been estimated to be ~ 1 arcsecond. The uncertainties at 6.7 um are larger, being based on a single raster with a pixel size of 3 arcseconds. The uncertainties of the 90 and 175 um positions are an order of magnitude larger again, with matching radii of 30 and 60 arcseconds, respectively.

Dec
The Declination of the ELAIS source in the selected equinox based on in order of preference their detections at 15 um, 20 cm, 6.7 um, 90 um and 175 um. This coordinate was given in J2000.0 coordinates to a precision of 0.0001 arcseconds in the original table. The 1-sigma positional uncertainties at 15-um and 20-cm have been estimated to be ~ 1 arcsecond. The uncertainties at 6.7 um are larger, being based on a single raster with a pixel size of 3 asrcseconds. The uncertainties of the 90 and 175 um positions are an order of magnitude larger again, with matching radii of 30 and 60 arcseconds, respectively.

LII
The Galactic Longitude of the ELAIS source.

BII
The Galactic Latitude of the ELAIS source.

Flux_20_cm
The 20-cm (1.5-GHz) flux density of the ELAIS source, in mJy. If there was no radio detection at the position of the ELAIS source, then the 3-sigma upper limit is given as a negative value: thus, a flux of -0.69 mJy means that the 3-sigma upper limit was 0.69 mJy.

Flux_20_cm_Error
The rms uncertainty in the 20-cm flux density of the ELAIS source, in mJy.

Flux_175_um
The 175-micron (1700-GHz) flux density of the ELAIS source, in mJy.

Flux_175_um_Error
The rms uncertainty in the 175-micron flux density of the ELAIS source, in mJy.

SNR_175_um
The signal-to-noise ratio of the ELAIS source, at 175 microns.

Offset_175_um
The positional offset of the 175-micron position from the nominal most accurate position, in arcseconds.

Flux_90_um
The 90-micron (3300-GHz) flux density of the ELAIS source, in mJy.

Flux_90_um_Error
The rms uncertainty in the 90-micron flux density of the ELAIS source, in mJy.

SNR_90_um
The signal-to-noise ratio of the ELAIS source, at 90 microns.

Offset_90_um
The positional offset of the 90-micron position from the nominal most accurate position, in arcseconds.

Flux_15_um
The 15-micron flux density of the ELAIS source, in mJy.

SNR_15_um
The signal-to-noise ratio of the ELAIS source, at 15 microns

Flux_6p7_um
The 6.7-micron flux density of the ELAIS source, in mJy.

Flux_6p7_um_Error
The rms uncertainty in the 6.7-micron flux density of the ELAIS source, in mJy.

Flux_6p7_um_Flag
The 6.7-micron flux density reliability flag, coded as follows:

        2 = high reliability
        3 = medium reliability
       20 = not specified in the text (may be a typo)
  

Radio_IR_Assoc_Flag
A flag parameter indicating the details about the radio and IR source association, coded as follows:

         1: if radio flux force-merged (15-um and radio positions within 5")
         2: if 6.7-um flux force-merged
         3: if 90-um association is not the most likely, where there are
            multiple associations
         4: if 175-um association is not the most likely, where there are
            multiple associations
         5: if second-best optical association for 15 um has been preferred
            on basis of radio position
         6: if source has an IRAS association
         7: if 1 and 6 both set
         8: if 3 and 4 both set
         9: if 1 and 8 both set, or 4 and 5 both set
  

Optical_Assoc_Flag
A flag parameter indicating the details about the optical source association, coded as follows (where WFS refers to the INT ugriz Wide Field Survey):

         1: if source falls in gaps between WFS chips, so no optical data,
         2: if source falls near edge of WFS chip, so photometry may be
            unreliable
         3: if source has multiple optical counterparts
         4: if source is blank in optical (i.e. no optical counterpart with
            probability of association >0.7 within specified search radius)
         6: if there is an association in NED
         7: if association is bright star
         8: if flags 1 and 7 set
         9: if flags 3 and 7 set
  

Jmag
The J-magnitude of the ELAIS source taken from the source coded in the ref_jmag parameter.

Jmag_Error
The rms uncertainty in the J-magnitude of the ELAIS source.

Hmag
The H-magnitude of the ELAIS source taken from the source coded in the ref_jmag parameter.

Hmag_Error
The rms uncertainty in the H-magnitude of the ELAIS source.

Kmag
The K-magnitude of the ELAIS source taken from the source coded in the ref_jmag parameter.

Kmag_Error
The rms uncertainty in the K-magnitude of the ELAIS source.

Ref_Jmag
The near-IR photometry reference for the JHK magnitudes, coded as follows:

         1: if J,H,K magnitudes from 2MASS, CDS Cat. II/246
         2: if J, K magnitudes from Vaisanen et al. (2002, MNRAS, 337, 1043)
         3: if K magnitudes from Rigopoulou et al. (2004, in preparation)
         4: if K magnitude from Pozzi et al. (2003, MNRAS, 343, 1348)
         5: if K magnitude from Sajina et al. (2003, MNRAS, 343, 1365)
  

RA_Optical
The Right Ascension of the optical counterpart to the ELAIS source in the selected equinox. This coordinate was given in J2000.0 coordinates to a precision of 0.0001 seconds of time in the original table

Dec_Optical
The Declination of the optical counterpart to the ELAIS source in the selected equinox. This coordinate was given in J2000.0 coordinates to a precision of 0.0001 arcseconds in the original table.

Umag
The INT Wide Field Survey (WFS) U-magnitude of the ELAIS source.

Umag_Error
The rms uncertainty in the WFS U magnitude.

Gmag
The INT Wide Field Survey (WFS) g-Prime (g') magnitude of the ELAIS source.

Gmag_Error
The rms uncertainty in the WFS g-Prime magnitude.

Rmag
The INT Wide Field Survey (WFS) r-Prime (r') magnitude of the ELAIS source.

Rmag_Error
The rms uncertainty in the WFS r-Prime magnitude.

Imag
The INT Wide Field Survey (WFS) i-Prime (i') magnitude of the ELAIS source.

Imag_Error
The rms uncertainty in the WFS i-Prime magnitude.

Zmag
The INT Wide Field Survey (WFS) Z magnitude of the ELAIS source.

Zmag_Error
The rms uncertainty in the WFS Z magnitude.

Umag_Star_Gal_Flag
The WFS star/galaxy flag in the U band: a value of -1 corresponds to a stellar image, while 1 corresponds to a spatially extended image.

Gmag_Star_Gal_Flag
The WFS star/galaxy flag in the g' band: a value of -1 corresponds to a stellar image, while 1 corresponds to a spatially extended image

Rmag_Star_Gal_Flag
The WFS star/galaxy flag in the r' band: a value of -1 corresponds to a stellar image, while 1 corresponds to a spatially extended image

Imag_Star_Gal_Flag
The WFS star/galaxy flag in the i' band: a value of -1 corresponds to a stellar image, while 1 corresponds to a spatially extended image

Zmag_Star_Gal_Flag
The WFS star/galaxy flag in the Z band: a value of -1 corresponds to a stellar image, while 1 corresponds to a spatially extended image

SExtractor_Rmag
The SExtractor r' magnitude of the ELAIS source.

SExtractor_Sg_Class
The SExtractor star/galaxy classification flag in the r' band: a value of 0.0 corresponds to a galaxy, while > 0.7 corresponds to a stellar image.

Tot_Offset_Optical
The total positional offset of the optical position from the nominal most accurate position, in arcseconds.

RA_Offset_Optical
The positional offset of the optical position from the nominal most accurate position in the RA direction, in arcseconds.

Dec_Offset_Optical
The positional offset of the optical position from the nominal most accurate position in the Dec direction, in arcseconds.

Optical_Assoc_Prob
The probability of the optical association with the ELAIS source, using a threshold value of 0.7 (sources with no optical counterpart have been assigned values of 0.00). This parameter is defined in equation (5) of Gonzalez-Solares (2005, MNRAS, 358, 333) as the probability L that an optical object of magnitude m is the true counterpart of a source with an error ellipse defined by its major (sigma1) and minor (sigma2) axes, and separated by a distance r, given by L = [Q(m)exp(-r2/2)]/[2 pi sigma1 sigma_2_N(m)] where Q and N are the magnitude distributions of the sources and objects, respectively.

Optical_Assoc_Relbty
The reliability of the optical association with the ELAIS source (sources with no optical counterpart have been assigned values of 0.00). This parameter is defined in equation (6) of Gonzalez-Solares (2005, MNRAS, 358, 333) as Rj = Lj/[Sumi (Li) + (1-Q)]. The reliability provides information about the number of candidates with high likelihood values. A candidate will have large values of likelihood and reliability if it is the only probable counterpart of a source. In a case where there are multiple probable counterparts (in the sense of high likelihood), they all will have low reliability values.

Phot_SED_Type_No_Abs
The photometric spectral energy distribution (SED) type of the ELAIS source, assuming no dust extinction (AV = 0). These types are defined as follows:

         1: E galaxy
         2: Sab galaxy
         3: Sbc galaxy
         4: Scd galaxy
         5: Sdm galaxy
         6: starburst galaxy
         7: AGN 1 (fig. 9 of reference paper)
         8: AGN 2 (fig. 10 of reference paper)
  

Phot_Log_1pz_No_Abs
The logarithm of the quantity (1 + zph), where zph is the photometric redshift, derived assuming no dust extinction (AV = 0).

Phot_SED_Type_Free_Abs
The photometric spectral energy distribution (SED) type of the ELAIS source, assuming a free choice for the dust extinction AV. These types are defined as follows:

         1: E galaxy
         2: Sab galaxy
         3: Sbc galaxy
         4: Scd galaxy
         5: Sdm galaxy
         6: starburst galaxy
         7: AGN 1 (fig. 9 of reference paper)
         8: AGN 2 (fig. 10 of reference paper)
  

Phot_Log_1pz_Free_Abs
The logarithm of the quantity (1 + zph), where zph is the photometric redshift, derived assuming a free choice for the dust extinction AV.

Vmag_Absorption
The absorption in the V band AV for the ELAIS source, derived from the free fit for AV.

Vmag_Absorption_Error
The error in the absorption in the V band AV.

Spect_Redshift
The spectroscopic redshift zspect for the ELAIS source.

Object_Type
The object type derived from spectroscopy, using the following classification:

   Value   Meaning
    1     (spiral) galaxy
    2     emission-line, starburst
    3     absorption line, early type galaxy
    4     AGN
    5     Sy1
    6     Sy2
    7     star
    8     LINER
  

Ref_Redshift
This parameter contains a code for the reference for the object type and spectroscopic redshift, as follows:

          1: Perez-Fournon et al. (2004, in prep.)
          2: Serjeant et al. (2004, MNRAS, in prep)
          3: La Franca et al. (2004, ApJ, in press)
          4: Pozzi et al. (2003MNRAS.343.1348P)
          5: NED
          6: Morel et al. (2001MNRAS.327.1187M)
          7: SLOAN Survey
          8: Willott et al. (2003MNRAS.339..397W)
          9: Chapman et al. (2002ApJ...573...66C),
             Sajina et al. (2003MNRAS.343.1365S
  

Redshift
The 'best' estimated redshift for the ELAIS source, spectroscopic if one is available, photometric otherwise.

Optical_Luminosity
The bolometric optical luminosity of the ELAIS source, in solar luminosities.

IR_SED_Type_1
The infrared SED type of the ELAIS source, as discussed in Section 6 and Figures 26 - 29 of the reference paper.

IR_SED_Type_2
The infrared SED type of the ELAIS source, coded as follows:

         1 = cirrus
         2 = M82-starburst
         3 = Arp220-starburst
         4 = AGN dust torus
         5 = cooler cirrus
         6 = 2+4
  

IR_Luminosity
The infrared luminosity of the ELAIS source, in solar luminosities.

AGN_Torus_Luminosity
The AGN dust torus luminosity of the ELAIS source, if the 15-um emission is interpreted as being due to dust torus emission, in solar luminosities.

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


Contact Person

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

Page Author: Browse Software Development Team
Last Modified: 16-Nov-2012