ACDS V10.0 - Detailed Description of J/A+AS/142/41

ACDS V10.0 - Mon Jan 20 08:23:14 CET 2025

| # Detailed Description of J/A+AS/142/41 : SMC X-ray sources ROSAT PSPC catalogue (Haberl+, 2000) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    J/A+AS/142/41       SMC X-ray sources ROSAT PSPC catalogue   (Haberl+, 2000)
    ================================================================================
    A ROSAT PSPC catalogue of X-ray sources in the SMC region
           Haberl F., Filipovic M.D., Pietsch W., Kahabka P.
          <Astron. Astrophys. Suppl. Ser. 142, 41 (2000)>
          =2000A&AS..142...41H
    ================================================================================
    ADC_Keywords: X-ray sources ; Magellanic Clouds

    Mission_Name: ROSAT

    Keywords: catalogues - ISM: supernova remnants - galaxies: magellanic clouds -
              galaxies: stellar content - X-rays: galaxies - X-rays: stars

    Abstract:
        We present a catalogue of 517 discrete X-ray sources in a
        6°x6° field covering the Small Magellanic Cloud (SMC). The
        catalogue was derived from the pointed ROSAT PSPC observations
        performed between October 1991 and May 1994 and is complementary to
        the Large Magellanic Cloud (LMC) catalogue published by Haberl &
        Pietsch (1999, Cat. J/A+AS/139/277). We followed the same
        identification scheme and used, among other information, X-ray
        hardness ratios and spatial extent to classify unknown sources as
        candidates for active galactic nuclei (AGN), foreground stars,
        supernova remnants (SNRs), supersoft sources (SSSs) and X-ray
        binaries. For 158 sources a likely source type is given, from which 46
        sources are suggested as background AGN (including candidates
        resulting from a comparison of X-ray and radio images). Nearly all of
        the X-ray binaries known in the SMC were detected in ROSAT PSPC
        observations; most of them with luminosities below 1036erg/s
        suggesting that the fraction of high luminosity X-ray binary systems
        in the Magellanic Clouds (MCs) is not significantly larger than in our
        galaxy. Seventeen X-ray sources are associated with SNRs found in
        earlier work and we suggest here two additional extended sources as
        SNR candidates. Three very soft sources are newly classified as SSSs
        from which one is identified with the symbiotic star LIN 358 in the
        SMC.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × table2.dat       180      517   The catalogue of 517 ROSAT PSPC sources from a
                                      6°x6° field centered on the SMC

    See also:
       J/A+AS/139/277 : LMC X-ray sources ROSAT PSPC catalogue (Haberl+, 1999)
       J/A+AS/143/391 : ROSAT HRI catalogue of LMC X-ray sources (Sasaki+, 2000)
       J/A+AS/147/75  : ROSAT HRI catalogue of SMC x-ray sources (Sasaki+, 2000)

    Byte-by-byte Description of file:  table2.dat

       Bytes Format Units   Label     Explanations

       1-  3  I3    ---     ID        Source number
       5- 11  F7.1  ---     LI        Likelihood of existence
      13- 17  I5    s       Vign      Vignetting corrected net exposure time
      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 (J2000.0)
      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- 44  F5.1  arcsec  r90       Statistical 90% confidence error on the
                                       X-ray position
      46- 53  E8.3  ct/s    CR        PSPC 0.1-2.4 keV count rate
      55- 61  E7.2  ct/s    e_CR      Count rate error
      63- 67  F5.2  ---     HR1       ? Hardness ratio 1 (1)
      69- 72  F4.2  ---     e_HR1     ? Error on HR1
      74- 78  F5.2  ---     HR2       ? Hardness ratio 2 (1)
      80- 83  F4.2  ---     e_HR2     ? Error on HR2
      85- 89  F5.1  arcsec  Ext       Source extent
      91- 96  F6.1  ---     LIExt     Likelihood for the extent
      98-106  A9    ---     ROSAT     ROSAT observation identifier (2)
     108-109  I2    arcmin  Off-axis  Off-axis angle
     111-114  F4.1  ---     Dist      Distance to detector window support structure
                                       or detector rim (in units of FWHM of the
                                       instrument resolution at the position of the
                                       source in the detector)
     116-118  I3    ---     [KPF99]   Number of nearest source in Kahabka et al.,
                                       2000 (Cat. J/A+AS/136/81)
     120-179  A60   ---     Rem       Remarks

    Note (1): HR1=(H-S)/(S+H) and HR2=(H2=H1)/(H1+H2) where S, H, H1 and H2
               denote count rates in the 0.1-0.4keV, 0.5-2.0keV, 0.5-0.9keV and
               0.9-2.0keV bands, respectively. Not calculated in cases where not
               all required count rates are available
    Note (2): A "+" in the end marks merged observations

    Historical notes: In the first version of table2, the values of
       "Source extent" were expressed in pixel (1 pix = 15arcsec) but the unit
       indicated was arcsec.
       These values has been corrected on 15-May-2000, and are now really
        expressed in arcsec.

    Acknowledgements: Frank Haberl, MPE Garching fwh@xray.mpe.mpg.de

    ================================================================================
    (End)                                          Patricia Bauer [CDS]  15-Feb-2000