Access to Astronomical Catalogues

J/A+A/378/30        ROSAT-BSC galaxy identifications         (Zimmermann+, 2001)
Galaxy identifications in the ROSAT All-Sky Survey.
       Zimmermann H.-U., Boller T., Doebereiner S., Pietsch W.
      <Astron. Astrophys. 378, 30 (2001)>
      =2001A&A...378...30Z
ADC_Keywords: X-ray sources ; Galaxies, optical ; Cross identifications

Keywords: surveys - X-rays - galaxies: general


Description:
    In a correlation study of the ROSAT All-Sky Survey Bright Source
    Catalogue (RASS-BSC, Cat. <XI/10>) with the Catalogue of Principal
    Galaxies (PGC, Cat. VII/119) 904 X-ray sources were found that
    possess possible extragalactic counterparts within a search radius of
    100".

    File table1 contains 1124 optical galaxy entries and 904 relevant
    X-ray candidates/counterparts from the ROSAT All-Sky Survey. Besides a
    compilation of X-ray and optical parameters for each source, also the
    results of an identification screening are given. 547 optical/X-ray
    correlations have been quoted as reliable identifications. The 904
    optical images with X-ray overlay contours (xID_nnn.ps.gz) used in the
    screening process are added for each user's own judgement.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       307     1124   Galaxy list
images/*           0      904   Individual optical images with X-ray overlay
                              contours


See also:
   IX/10   : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
   VII/119 : Catalogue of Principal Galaxies (PGC) (Paturel+ 1989)


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

   Bytes Format Units      Label     Explanations

   1-  4  I4    ---        Seq       Running number in table
   6-  8  I3    ---        XID       Identification number of X-ray object
                                      related to image number (1)
  11- 12  I2    ---        SID       [1,10] Identifies the optical candidate 
                                      for a specific X-ray source
  14- 17  A4    ---        ---       [1RXS]
  19- 34  A16   ---        1RXS      1RXS (Cat. IX/10) identifier for the
                                      X-ray source
  36- 37  I2    h          RAh       X-ray source right ascension (J2000)
  39- 40  I2    min        RAm       X-ray source right ascension (J2000)
  42- 46  F5.2  s          RAs       X-ray source right ascension (J2000)
      48  A1    ---        DE-       X-ray source declination sign (J2000)
  49- 50  I2    deg        DEd       X-ray source declination (J2000)
  52- 53  I2    arcmin     DEm       X-ray source declination (J2000)
  55- 58  F4.1  arcsec     DEs       X-ray source declination (J2000)
  60- 67  I8    s          Exp       Exposure time of X-ray source
  69- 77  I9    arcsec     e_DEs     Uncertainty of X-ray position
  79- 86  F8.5  ct/s       CRate     Count rate of X-ray source
  88- 95  F8.5  ct/s       e_CRate   Uncertainty of rate
  97-100  I4    ---        LH        Likelihood of detection
 102-107  F6.1  ct         Counts    Total counts from X-ray source
 109-114  I6    ---        LHext     Likelihood that X-ray source is extended
                                      (interpret with care !)
 116-121  I6    arcsec     Extent    Extent in arcsec
 123-147  A25   ---        OName     Name of optical candidate
 149-150  I2    h          RAoh      Optical candidate right ascension (J2000)
 152-153  I2    min        RAom      Optical candidate right ascension (J2000)
 155-159  F5.2  s          RAos      Optical candidate right ascension (J2000)
     161  A1    ---        DEo-      Optical candidate declination sign (J2000)
 162-163  I2    deg        DEod      Optical candidate declination (J2000)
 165-166  I2    arcmin     DEom      Optical candidate declination (J2000)
 168-172  F5.2  arcsec     DEos      Optical candidate declination (J2000)
 174-178  F5.2  mag        Bmag      ? B magnitude of optical candidate
 180-186  F7.1  arcsec     e_DEos    ? Optical position uncertainty
 188-193  A6    ---        Type      Type of optical candidate
 195-209  A15   ---        Type1     Detailed type of optical candidate
 211-218  A8    ---        Activity  type of activity (optical)
 220-227  F8.0  km/s       Vrec      ? Recession velocity
 229-230  I2    ---        Origin    Origin of parameters (2)
 232-233  I2    ---        Class     Classification (3)
 235-239  F5.3  10+22/cm+2 NH        Galactic hydrogen column density
 241-245  F5.1  arcsec     Dist      Distance between X-ray object and
                                      optical candidate
 247-255  F9.2  [mW/m2]    logFX     log10 of X-ray flux in the 0.1-2.4keV
                                       X-ray band
 257-262  F6.2  [10-7W]    logLX     ? log10 of X-ray luminosity using
                                        H0=70km/Mpc/s
 264-275  A12   ---        Corr      Reliability of correlating the X-ray and
                                      optical source
 277-307  A31   ---        Comment   Comments (4)

Note (1): The XID number defines the figure number in "images" subdirectory,
     e.g. XID 23 has the image xID_023.ps
Note (2): Origin of parameters:
     0 from PGC only,
     1 from NED,
    11 from NED + (Pietsch et al., 1998A&A...333...48P),
    21 from NED + (Bischoff et al., 1999, in Highlights in X-ray
       Astronomy in honour of Joachim Truemper's 65th birthday, ed.
       B. Aschenbach, & M. J. Freyberg, MPE Report, 272, 22)
Note (3): Whether galaxy is
     0 in binary,
     2 in group,
     3 in cluster of galaxies or near to line-of-sight projection
        towards cluster of galaxies
Note (4): cl? means source belongs to the "suspected cluster sample"



Acknowledgements: "Hans-Ulrich Zimmermann, MPE Garching" 

(End)                                        Patricia Bauer [CDS]    18-Oct-2001