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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 180 517 The catalogue of 517 ROSAT PSPC sources from a
6°x6° field centered on the SMC
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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
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Bytes Format Units Label Explanations
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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
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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
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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
(End) Patricia Bauer [CDS] 15-Feb-2000