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J/ApJ/680/130     Mid-IR colors of AGNs in the MUSYC ECDF-S   (Cardamone+, 2008)
Mid-infrared properties and color selection for X-Ray-detected active galactic
nuclei in the MUSYC Extended Chandra Deep Field-South.
    Cardamone C.N., Urry C.M., Damen M., Van Dokkum P., Treister E., Labbe I.,
    Virani S.N., Lira P., Gawiser E.
   <Astrophys. J., 680, 130-142 (2008)>
    =2008ApJ...680..130C    (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Surveys ; Cross identifications ;
              Photometry, infrared ; X-ray sources
Keywords: infrared: galaxies - quasars: general - X-rays: galaxies


Abstract:
    We present the mid-infrared colors of X-ray-detected AGNs and explore
    mid-infrared selection criteria. Using a statistical matching
    technique, the likelihood ratio, over 900 IRAC counterparts were
    identified with a new MUSYC X-ray source catalog that includes ∼1000
    published X-ray sources in the Chandra Deep Field-South and Extended
    Chandra Deep Field-South. Most X-ray-selected AGNs have IRAC spectral
    shapes consistent with power-law slopes, fν∝να,
    and display a wide range of colors, -2≤alpha≤2 Although X-ray
    sources typically fit to redder (more negative α) power laws
    than non-X-ray-detected galaxies, more than 50% do have flat or blue
    (galaxy-like) spectral shapes in the observed 3-8um band. Only a
    quarter of the X-ray-selected AGNs detected at 24um are well fit by
    featureless red power laws in the observed 3.6-24um, likely the subset
    of our sample whose infrared spectra are dominated by emission from
    the central AGN region. Most IRAC color selection criteria fail to
    identify the majority of X-ray-selected AGNs, finding only the more
    luminous AGNs, the majority of which have broad emission lines. In
    deep surveys, these color selection criteria select 10%-20% of the
    entire galaxy population and miss many moderate-luminosity AGNs.

Description:
    The Multiwavelength Survey by Yale-Chile (MUSYC; Gawiser et al. 2006,
    J/ApJS/162/1) is a square-degree survey of four fields to limiting
    depths of RAB& and KAB" with extensive follow-up spectroscopy.
    For this study, we use the two X-ray surveys that have overlapping
    coverage one MUSYC field: the very deep central Chandra Deep
    Field-South (CDF-S; G02, J/ApJS/139/369; A03, J/AJ/126/539) and the
    deep ECDF-S (L05, J/ApJS/161/21; V06, J/AJ/131/2373). Recently, the
    existing MUSYC data in the ECDF-S were augmented with very deep IRAC
    Spitzer data in the SIMPLE survey (M. Damen et al. 2009, in
    preparation) and by GOODS and the Spitzer Wide-area InfraRed
    Extragalactic survey (SWIRE) at 24um.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       145     1017   X-ray and infrared properties of MUSYC
                             ECDF-S X-ray sources


See also:
 II/253  : Chandra Deep Field South: multi-colour data (Wolf+, 2008)
 III/250 : The VIMOS VLT deep survey (VVDS-DEEP) (Le Fevre+ 2005)
 J/ApJS/183/295  : A K-selected catalog of the ECDFS from MUSYC (Taylor+, 2009)
 J/A+A/478/83    : GOODS-South Field VLT/FORS2 redshifts. III. (Vanzella+, 2008)
 J/AJ/134/1103   : MUSYC deep near-infrared imaging (Quadri+, 2007)
 J/ApJS/162/1    : MUSYC: optical source catalog (Gawiser+, 2006)
 J/AJ/131/2373   : Extended Chandra Deep Field-South survey (Virani+, 2006)
 J/ApJS/161/21   : Extended Chandra Deep Field-South survey (Lehmer+, 2005)
 J/ApJS/155/271  : Chandra Deep Field-South: Optical spectroscopy (Szokoly+,
                    2004)
 J/AJ/126/539    : The Chandra Deep Fields North and South (Alexander+, 2003)
 J/ApJS/139/369  : Chandra Deep Field South. 1 Ms catalog (Giacconi+, 2002)
 J/MNRAS/328/150 : KX redshift survey (Croom+, 2001)
 http://www.astro.yale.edu/MUSYC : MUSYC Public Data Release webpage
 http://data.spitzer.caltech.edu/popular/simple : Online data from SIMPLE
                   (Spitzer's IRAC and MUSYC Public Legacy of the E-CDFS) survey


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     ID        Running MUSYC XR Source catalog number (1)
   6- 12  A7    ---     CatID     Original catalog number (AYY:NNN) (2)
  14- 22  F9.6  deg     RAXdeg    X-ray Right Ascension in decimal degrees (J2000)
  24- 33  F10.6 deg     DEXdeg    X-ray Declination in decimal degrees (J2000)
  35- 39  F5.2  ---     HR        X-ray Hardness Ratio (3)
  41- 49  F9.2  uJy     F3.6      ?=99.00 IRAC Channel 1 (3.6um) flux density
  51- 56  F6.2  uJy     e_F3.6    ?=33.00 The 1σ error for F3.6um
  58- 66  F9.2  uJy     F4.5      ?=99.00 IRAC Channel 2 (4.5um) flux density
  68- 73  F6.2  uJy     e_F4.5    ?=33.00 The 1σ error for F4.5um
  75- 83  F9.2  uJy     F5.8      ?=99.00 IRAC Channel 3 (5.8um) flux density
  85- 90  F6.2  uJy     e_F5.8    ?=33.00 The 1σ error for F5.8um
  92-100  F9.2  uJy     F8.0      ?=99.00 IRAC Channel 4 (8.0um) flux density
 102-107  F6.2  uJy     e_F8.0    ?=33.00 The 1σ error for F8.0um
     109  A1    ---     r_F24     Source Catalog for MIPS 24 micron flux (4)
 111-117  F7.2  uJy     F24       ?=99.00 Spitzer/MIPS 24 micron flux
 119-125  F7.2  uJy     e_F24     ?=33.00 The 1σ error for F24um
 127-132  F6.2  [10-7W] logLX     ?=1.00 Log of X-ray luminosity in units of
                                erg/s (5)
 134-135  I2    ---     r_logLX   ?=1 Source of redshift (6)
 137-145  A9    ---     notes     Emission lines comment (7)

Note (1): Sources are <[CUD2008] NNNN> in Simbad.

Note (2): Original detection catalog for X-ray source and X-ray source ID:
    G02 =Giacconi et al. 2002, Cat. J/ApJS/139/369 (<[GZW2002] XID NNN>
          or <CXOCDFS JHHMMSS.s+DDMMSS> in Simbad)
    A03 =Alexander et al. 2003, Cat. J/AJ/126/539 (<[ABB2003] CDFS NNN> in
          Simbad)
    L05 =Lehmer et al. 2005, Cat. J/ApJS/161/21 (<[LBA2005] NNN>
          or <CXOECDFS JHHMMSS.s-DDMMSS> in Simbad)
    V06 =Virani et al.2006., Cat. J/AJ/131/2373 (<[VTU2006] NNN>
          or <CXOYECDF JHHMMSS.s+DDMMSS> in Simbad)
Note (3): Hardness ratio, defined by (H-S)/(H+S), where H and S are the
     X-ray counts in the hard (2-8keV) and soft (0.5-2keV) bands,
     respectively. For sources detected only in the hard band (soft band),
     the hardness ratio is set equal to 1 (-1). For sources detected only
     in the full band (0.5-8keV), the hardness ratio is set equal to 10.
     G02 (Giacconi et al. 2002, Cat. J/ApJS/139/369) defined the hard band
     as 2-10keV. Therefore, we adjusted the published hard band counts from
     G02 to equal those that would have been detected at 2-8keV, using
     PIMMS with the average X-ray spectrum measured by G02.
Note (4): Source of 24 micron flux as follows:
   S =SWIRE (Lonsdale et al., 2003PASP..115..897L),
   G =GOODS (Dickinson et al., 2003mglh.conf..324D).
Note (5): Observed luminosity in the 0.5-8keV band, using references
   given in final column.
Note (6): Source of redshift used to calculate the luminosity as follows:
    0 =VLT/FORS2 Spectroscopy Version 1.0
    1 =VIMOS VLT Deep Survey (VVDS) Version 1.0 (Cat. III/250)
    2 =spectroscopic redshifts from Szokoly et al. (2004, Cat. J/ApJS/155/271)
    3 =spectroscopic redshifts from Croom et al. (2001, Cat. J/MNRAS/328/150)
    4 =spectroscopic redshifts from MUSYC Treister et al. (2009ApJ...693.1713T)
    5 =photometric redshifts from COMBO-17 Wolf et al. (2004, Cat. II/253)
Note (7): Classification as follows:
      BLAGN =spectra showing broad emission lines (BL);
  non-BLAGN =spectra without broad lines;
       star =stellar source;
        ELG =emission line galaxy;
        ALG =absorption line galaxy.


History:
    From electronic version of the journal
(End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    13-Oct-2010