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J/MNRAS/366/171     Red AGN in XMM/SDSS fields              (Georgakakis+, 2006)
Red active galactic nuclei in XMM-Newton/Sloan Digital Sky Survey fields.
    Georgakakis A.E., Georgantopoulos I., Akylas A.
   <Mon. Not. R. Astron. Soc., 366, 171-181 (2006)>
   =2006MNRAS.366..171G
ADC_Keywords: Surveys ; X-ray sources ; Active gal. nuclei

Keywords: surveys - X-rays: galaxies - X-rays: general


Abstract:
    In this paper we combine archival and proprietary XMM-Newton
    observations (about 5deg2) that overlap with the Sloan Digital Sky
    Survey to explore the nature of the moderate-z X-ray population. We
    focus on X-ray sources with optically red colours (g-r>0.4), which we
    argue are important for understanding the origin of the X-ray
    background (XRB).

Description:
    In this paper, we use 28 XMM-Newton archival observations selected to
    overlap with the second data release of the SDSS (DR2, Stoughton et
    al., 2002AJ....123..485S) and with a proprietary period that expired
    before 2003 September.
    For this paper, the source extraction is performed in the 2-8keV
    merged PN plus MOS images (when available) using the EWAVELET task of
    SAS with a detection threshold of 6σ.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       112       84   Optical and X-ray properties of the hard X-ray
                              selected sample


See also:
 http://www.sdss.org/ : SDSS Home Page
 J/A+A/432/69    : Extremely Red Objects XMM-Newton observations (Brusa+, 2005)
 J/MNRAS/349/135 : XMM-Newton/2dF survey. II. (Georgakakis+, 2004)
 J/MNRAS/352/91  : XMM-Newton/2dF survey. IV. (Georgantopoulos+, 2004)


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

   Bytes Format Units      Label     Explanations

   1-  2  I2    ---       [GGA2006]  Sequential number
       3  A1    ---     n_[GGA2006]  Note on [GGA2006] (1)
   5-  6  I2    h          RAh       X-ray Right ascension (J2000)
   8-  9  I2    min        RAm       X-ray Right ascension (J2000)
  11- 15  F5.2  s          RAs       X-ray Right ascension (J2000)
      17  A1    ---        DE-       Declination sign (J2000)
  18- 19  I2    deg        DEd       Declination (J2000)
  21- 22  I2    arcmin     DEm       Declination (J2000)
  24- 28  F5.2  arcsec     DEs       Declination (J2000)
  30- 34  F5.2  mag        rmag      r magnitude
      36  A1    ---        l_P       Limit flag on P
  37- 40  F4.2  %          P         Probability that the optical counterpart
                                      is a chance coincidence
  42- 46  F5.2  10-17W/m2  FX        X-ray flux in the 2-8keV band
  48- 51  F4.2  10-17W/m2  e_FX      rms uncertainty on FX
  53- 57  F5.2  ---      logFX/Fopt  X-ray-to-optical flux ratio
  59- 63  F5.3  ---        zsp       ?=- Spetroscopic redshift
  65- 66  A2    ---        SpClass   Spetroscopic classification (2)
  68- 72  F5.3  ---        zph       ?=- Photometric redshift
  74- 78  F5.2  ---        logLX     X-ray luminosity in the 2-8keV band,
                                      corrected for X-ray absorption
      80  A1    ---        l_NH      Limit flag on NH
  81- 85  F5.2  10+22cm-2  NH        ?=- Rest-frame hydrogen column density
  87- 91  F5.2  10+22cm-2  E_NH      ? Error on NH (upper limit)
  93- 97  F5.2  10+22cm-2  e_NH      ? Error on NH (lower limit)
  99-102  F4.2  ---        Gamma     ?=- Power-law spectral index
 104-107  F4.2  ---        E_Gamma   ? Error on Gamma (upper limit)
 109-112  F4.2  ---        e_Gamma   ? Error on Gamma (lower limit)

Note (1): Notes as follows:
      a = Photometric redshift from the LX-log(FX-Fopt)
      b = Source #72 is classified Galactic star by 2QZ. Inspection of the
          optical spectrum however, suggests an early-type galaxy at z=0.243.
      c = Source #84 has no spectral classification in NED
Note (2): Spectral class as follows:
     AL = for absorption-line systems
     NL = for narrow emission-line sources
     BL = broad emission-line optical spectra


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    02-Jun-2006