Access to Astronomical Catalogues

J/A+AS/132/341      ROSAT GPS optical identification (Motch+ 1998)
Identification  of selected sources for the ROSAT Galactic Plane Survey. I.
     Motch C., Guillout P., Haberl F., Krautter J., Pakull M.W., Pietsh W.,
     Reinsch K., Voges W., Zickgraf F.-J.
    <Astron. Astrophys. Suppl. Ser. 132, 341 (1998)>
    =1998A&AS..132..341M      (SIMBAD/NED BibCode)
ADC_Keywords: X-ray sources ; Cross identifications

Mission_Name: ROSAT

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


Abstract:
    We report on optical searches in the error circles of 93 ROSAT survey
    sources located at low galactic latitudes (|b|<20°). These sources
    were extracted from the ROSAT Galactic Plane Survey using various
    selection criteria on hardness ratio, X-ray and optical brightness and
    integrated galactic absorption in the direction of the source. We find
    optical identifications in 76 cases, among which are 25 new AGN, 6 new
    CVs and a new Be/X-ray binary. In order to illustrate the relevance of
    the source selections applied here, we cross-correlated the ROSAT
    all-sky survey bright source list with SIMBAD. Different classes of
    X-ray emitters populate distinct regions of a multi dimensional
    parameter space involving flux ratios, galactic latitude and NH.
    This relatively good segregation offers the possibility to build
    source samples with enhanced probability of identification with a
    given class. Complete optical identification of such subsamples could
    eventually be used to compute meaningful probabilities of
    identification for all sources using as basis a restricted set of
    multi-wavelength information.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table4.dat        99       93   X-ray characteristics of ROSAT survey sources
                                  derived from the SASS as in October 1991
table5.dat        96       93   Optical identifications of ROSAT survey sources


See also:
   IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1996)
   J/A+A/318/111 : ROSAT Galactic Plane Survey (Motch+ 1997)


Byte-by-byte Description of file: table4.dat

   Bytes Format Units   Label     Explanations

   1- 15  A15   ---     RXJ       Source name
      17  A1    ---     Source    [XAOBS] Source selection origin (1)
  19- 20  I2    h       RAh       Right ascension (J2000.0)
  22- 23  I2    min     RAm       Right ascension (J2000.0)
  25- 28  F4.1  s       RAs       Right ascension (J2000.0)
      30  A1    ---     DE-       Declination sign
  31- 32  I2    deg     DEd       Declination (J2000.0)
  34- 35  I2    arcmin  DEm       Declination (J2000.0)
  37- 38  I2    arcsec  DEs       Declination (J2000.0)
  40- 43  F4.1  arcsec  r90       ? 90% confidence radius
  45- 49  F5.3  ct/s    Count     Count rate
  51- 55  F5.3  ct/s    e_Count   rms uncertainty on Count
  57- 61  F5.2  ---     HR1       Hard ratio 1
  63- 66  F4.2  ---     e_HR1     ? rms uncertainty on HR1
  68- 72  F5.2  ---     HR2       Hard ratio 2
  74- 77  F4.2  ---     e_HR2     ? rms uncertainty on HR2
  79- 99  A21   ---     1RXS      1RXS (Cat. IX/10) designation

Note (1): X: X-ray binary like
          S: Soft white dwarf candidate
          A: Absorption supersoft candidate
          B: X-ray bright source
          O: Other remaining source


Byte-by-byte Description of file: table5.dat

   Bytes Format Units   Label     Explanations

   1- 15  A15   ---     RXJ       Source name
      17  A1    ---     Sel       [XAOBS] Source selection origin (1)
  19- 22  F4.2  ---     Dist      ? X-ray to optical distance in units of the
                                      90% confidence radius
  24- 25  I2    h       RAh       ? Right ascension (J2000.0)
  27- 28  I2    min     RAm       ? Right ascension (J2000.0)
  30- 34  F5.2  s       RAs       ? Right ascension (J2000.0)
      36  A1    ---     DE-       Declination sign
  37- 38  I2    deg     DEd       ? Declination (J2000.0)
  40- 41  I2    arcmin  DEm       ? Declination (J2000.0)
  43- 46  F4.1  arcsec  DEs       ? Declination (J2000.0)
  48- 67  A20   ---     IdOpt     Optical identification
  69- 73  F5.2  mag     Vmag      ? V magnitude
  75- 79  F5.2  mag     Bmag      ? B magnitude
  81- 84  A4    ---     Class     Class (2)
  87- 94  A8    ---     Mtype     Spectral or morphological type
      96  A1    ---     Chart     [Y] Y: a finding chart is provided

Note (1):  X: X-ray binary like
           S: Soft white dwarf candidate
           A: Absorption supersoft candidate
           B: X-ray bright source
           O: Other remaining source
Note (2): AC: active corona
         Gal: Normal galaxy
         AGN: Active galactic nucleus
        Be/X: Be/X-ray binary
        UNID: Unidentified
          WD: Isolated white dwarf


Acknowledgements: Christian Motch 

(End)                                         Patricia Bauer [CDS]   08-Oct-1998