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SWIRECXO - Spitzer Wide-Area IR Extra-Galactic Survey Chandra X-Ray Sources



This table contains results from deep combined observations with Spitzer and Chandra of the Spitzer Wide-Area Infrared Extragalactic Survey (SWIRE) in the ELAIS N1 region. This survey was used to investigate the nature of the faint X-ray and IR sources in common, to identify active galactic nucleus (AGN)/starburst diagnostics, and to study the sources of the X-ray and cosmic infrared backgrounds (XRB and CIRB). In the 17' x 17' area of the Chandra ACIS-I image there were approximately 3400 SWIRE near-IR sources with 4-sigma detections in at least two Infrared Array Camera (IRAC) bands and 988 sources detected at 24 micron (um) with the Multiband Imaging Photometer (MIPS) brighter than a 24-um flux S_24 ~ 0.1 mJy. Of these, 102 IRAC and 59 MIPS sources have Chandra counterparts, out of a total of 122 X-ray sources present in the area with 0.5 - 8 keV flux > 10-15 erg cm^-2 s^-1.

The SWIRE ELAIS N1 field was imaged by the IRAC multiband camera on Spitzer in 2004 January and with MIPS in early 2004 February. The observations were centered at the position (16h 00m, +59d 01'). The X-ray observations were taken as part of the ELAIS Deep X-ray Survey (EDXS) and are described in detail in Manners et al. (2003, MNRAS, 343, 293). For this analysis, the Chandra Advanced CCD Imaging Spectrometer (ACIS) observation of 75 ks centered on (16h 10m 20.11s, +54d 33' 22.3") (J2000.0) in the ELAIS N1 region. The aim point was focused on the ACIS-I chips, which consist of four CCDs arranged in a 2 x 2 array covering an area of 16.9' x 16.9' (286 square arcmin). Bad pixels and columns were removed, and data were filtered to eliminate high background times (due to strong solar flares), leaving 71.5 ks of good data after filtering. Counts-to-photon calibration assumed a standard power-law model spectrum with photon index Gamma = 1.7. Sources were detected to flux levels of 2.3 x 10^-15 erg s^-1 cm^-2 in the 0.5 - 8 keV band, 9.4 x 10^-16 erg s^-1 cm^-2 in the 0.5 - 2 keV band, and 5.2 x 10^-15 erg s^-1 cm^-2 in the 2 - 8 keV band. Sources are detectable to these flux limits over 90% of the nominal survey area. For this analysis, the authors used sources detected in the full band of ACIS-I only, of which there are 122 in the N1 region. Of the 102 sources in common between Chandra and SWIRE, 83 have significant detections in the separate soft X-ray band (0.5 - 2 keV) and 64 are detected in the hard (2 - 8 keV) band.

A simple near-neighbor search was performed to cross-correlate the Spitzer and Chandra source catalogs within the Chandra ACIS-I chip image, using a d = 5" search radius (roughly the quadratic sum of the astrometric errors). All together, the authors found reliably associated counterparts for 102 of the 122 Chandra sources (84% in total). The vast majority of these were detected with the IRAC channels 1 and 2 (3.6 and 4.5 um): 100 of the 122 Chandra sources in each case. As many as 59 Chandra objects are reliably associated with MIPS 24 um sources (all of them having IRAC counterparts), and just 1 had a MIPS 70 um counterpart. Of the 102 Spitzer-identified Chandra sources, three turned out to correspond to Galactic stars on the basis of their position on color-magnitude plots and optical morphology and were excluded from the subsequent analysis (and this table).

Catalog Bibcode



A complete multiwavelength characterization of faint Chandra X-ray sources
seen in the Spitzer wide-area infrared extragalactic (SWIRE) survey.
    Franceschini A., Manners J., Polletta M.D.C., Lonsdale C.,
    Gonzalez-Solares E., Surace J., Shupe D., Fang F., Xu C.K., Farrah D.,
    Berta S., Rodighiero G., Perez-Fournon I., Hatziminaoglou E., Smith H.E.,
    Siana B., Rowan-Robinson M., Nandra K., Babbedge T., Vaccari M., Oliver S.,
    Wilkes B., Owen F., Padgett D., Frayer D., Jarrett T., Masci F., Stacey G.,
    Almaini O., McMahon R., Johnson O., Lawrence A., Willott C.
   <Astron. J., 129, 2074-2101 (2005)>


This table was created by the HEASARC in March 2007 based on CDS catalog J/AJ/129/2074 file table2.dat,


A running number for the X-ray source which acts as a unique identifier taken from the Manners et al. (2003, MNRAS, 343, 293) source list.

The X-ray source name, using the '[MJA2003] N1-' prefix followed by the source number, as recommended by the CDS Dictionary of Nomenclature of Celestial Objects for sources from Manners et al. (2003, MNRAS, 343, 293 in the ELAIS N1 field.

The Right Ascension of the X-ray source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10^-5 degrees (0.036") in the original table.

The Declination of the X-ray source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10^-5 degrees (0.036") in the original table.

The Galactic Longitude of the X-ray source.

The Galactic Latitude of the X-ray source.

The Spitzer IRAC 3.6-micron flux density, S_3.6, in mJy,.

The uncertainty in S_3.6, in mJy.

The Spitzer IRAC 4.5-micron flux density, S_4.5, in mJy,

The uncertainty in S_4.5, in mJy.

The Spitzer IRAC 5.6-micron flux density, S_5.6, in mJy,

The uncertainty in S_5.6, in mJy.

The Spitzer IRAC 8-micron flux density, S_8, in mJy,

The uncertainty in S_8, in mJy.

The Spitzer MIPS 24-micron flux density, S_24, in mJy,

The uncertainty in S_24, in mJy.

The angular distance from the Chandra source to the Spitzer identification, in arcseconds.

The Chandra (0.5 - 8 keV) flux of the X-ray source, in erg/cm^2/s.

The uncertainty in the X-ray flux, in erg/cm^2/s

The source type as inferred from the optical/IR spectral energy distribution (SED), using the following rubric:

       1 = type-1 AGN;
       2 = type-2 AGN;
       3 = galaxy;
       4 = early-type galaxy.

The X-ray source hardness ratio HR defined as (H-S)/(H+S), where H and S are the background-subtracted X-ray counts in the hard (2.0 - 8.0 keV) and soft (0.5 - 2.0 keV) bands, respectively.

The uncertainty in the X-ray hardness ratio, HR.

The (0.5 - 8 keV) band luminosity of the X-ray source, in erg/s,

The HEASARC Browse object classification, based on the source type parameter.

Contact Person

Questions regarding the SWIRECXO database table can be addressed to the HEASARC User Hotline.
Page Author: Browse Software Development Team
Last Modified: Tuesday, 17-Apr-2007 14:57:05 EDT