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J/MNRAS/349/135     XMM-Newton/2dF survey. II.              (Georgakakis+, 2004)
The XMM-Newton/2dF survey -
II. The nature of X-ray-faint optically bright X-ray sources.
    Georgakakis A., Georgantopoulos I., Vallbe M., Kolokotronis V.,
    Basilakos S., Plionis M., Stewart G.C., Shanks T., Boyle B.J.
   <Mon. Not. R. Astron. Soc., 349, 135-145 (2004)>
   =2004MNRAS.349..135G
ADC_Keywords: Surveys ; X-ray sources ; Cross identifications

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


Abstract:
    In this paper we investigate the properties of low X-ray-to-optical
    flux ratio sources detected in a wide-area (2.5°2) shallow
    [fX(0.5-8keV)∼10-14erg/s/cm2] XMM-Newton survey. We find a total
    of 26 sources (5 per cent of the total X-ray-selected population) with
    log(fX)/f(opt)←0.9 to the above flux limit. Optical spectroscopy is
    available for 20 of these low X-ray-to-optical flux ratio objects.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       112       26   Low X-ray-to-optical flux ratio sources in the
                             XMM-Newton/2dF survey


See also:
   VII/226 : 2dF Galaxy Redshift Survey 100k Data Release (2dFGRS Team, 2001)
   B/xmm   : XMM-Newton Observation Log (XMM-Newton SOC, 2002)
   IX/37   : XMM-Newton Serendipitous Source Catalogue (1XMM) (XMM-SSC, 2003)
   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    ---      Seq     Sequential number
   4- 30  A27   ---      Name    Name
  32- 33  I2    h        RAh     X-ray source right ascension (J2000.0)
  35- 36  I2    min      RAm     X-ray source right ascension (J2000.0)
  38- 42  F5.2  s        RAs     X-ray source right ascension (J2000.0)
      44  A1    ---      DE-     X-ray source declination sign (J2000.0)
  45- 46  I2    deg      DEd     X-ray source declination (J2000.0)
  48- 49  I2    arcmin   DEm     X-ray source declination (J2000.0)
  51- 54  F4.1  arcsec   DEs     X-ray source declination (J2000.0)
  56- 58  F3.1  arcsec   Off     Offset between the X-ray source centroid
                                  estimated by the EWAVELET task of SAS and the
                                  optical source centre
  60- 64  F5.2  mag      Bmag    B magnitude
      66  I1    ---      morph   [3/6] Optical morphology of the source  (1)
  68- 73  F6.4  ---      z       ? Redshift
  75- 77  A3    ---      r_z     Origin of the redshift (2)
  79- 82  A4    ---      Class   Spectral classification of the optical
                                  counterpart
  84- 91  A8    ---      Comm    Comments on the spectrum (3)

Note (1): morph is coded as follows:
      3 = for extended optical light profile (i.e. galaxy)
      6 = for unresolved optical light profile (i.e. star or QSO).
Note (2): Notes on redshift:
      1 = XMM-Newton/2dF spectroscopic programme
      2 = 2dFGRS, Cat. VII/226
      3 = Griffiths et al. (1995MNRAS.275...77G)
      4 = 2QZ, Cat. VII/223
      5 = SDSS, Cat. J/AJ/126/2579
      6 = Terlevich et al. (1991, Cat. J/A+AS/91/285)
Note (3): Comments:
      A = absorption lines
     NL = narrow emission lines
     BL = broad emission lines
     EA = absorption + emission lines


History:
    From electronic version of the journal

References:
    Georgakakis et al., Paper I         2003MNRAS.344..161G
    Basilakos et al.,   Paper III       2004MNRAS.351..989B
(End)                       James Marcout, Patricia Vannier [CDS]    07-May-2004