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

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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