J/A+A/388/100 ROSAT X-ray sources in LMC. II. (Kahabka, 2002)
ROSAT X-ray sources in the field of the LMC. II.
Statistics of background AGN and X-ray binaries
Kahabka P.
<Astron. Astrophys. 388, 100 (2002)>
=2002A&A...388..100K 2002A&A...388..100K
ADC_Keywords: X-ray sources ; Magellanic Clouds ; Surveys
Keywords: catalogues: Magellanic Clouds - galaxies: individual: LMC -
galaxies: active - galaxies: ISM - X-rays: galaxies - X-rays: stars
Abstract:
About 200 X-ray sources from a sample of spectrally hard ROSAT PSPC
sources, given in the catalog of Haberl & Pietsch (1999, Cat.
J/A+AS/139/277), and observed in a ∼60 square degree field of the
LMC during several archival pointed observations with a wide range of
exposure times have been reanalyzed. For these sources accurate count
rates and hardness ratios have been recalculated. In comparison to
Haberl & Pietsch (1999, Cat. J/A+AS/139/277) we used merged data
from all available observations and we derived average source
parameters by investigating each source individually. From a
simulation power-law spectral tracks have been derived in the HR1-HR2
plane and ∼170 sources have been classified as background X-ray
sources or as LMC X-ray binaries. 80% of the spectrally hard X-ray
sources with more than 50 observed counts have been found to be
consistent with background X-ray sources and 20% with LMC X-ray
binaries (53 sources with AGN and 15 with X-ray binaries).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 160 195 List of 195 spectrally hard ROSAT PSPC X-ray
sources in the LMC field (from Harberl & Prietsch,
1999, Cat. J/A+AS/139/277, [HP99] catalog)
notes.dat 96 73 Notes to table 1
refs.dat 68 20 References to table 1
table3.dat 161 97 List of 97 ROSAT PSPC X-ray sources in the
northern region of the LMC Supergiant Shell LMC4
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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)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
5- 15 A11 --- RX Source ROSAT name (HHMM.M+DDMM, J2000)
17- 20 I4 --- [HP99] Catalog index, Haberl & Pietsch (1999,
Cat. J/A+AS/139/277)
22- 24 I3 --- SHP ? Catalog index, Sasaki et al., 2000,
Cat. J/A+AS/143/391,
[SHP2000] LMC NN in Simbad
25 A1 --- u_SHP [?] Uncertainty flag on SHP
26- 34 F9.6 ct/s CR Total X-ray count rate
36- 43 F8.6 ct/s e_CR 1-sigma error of total count rate
45- 53 F9.6 ct/s CRhard Hard X-ray count rate
55- 62 F8.6 ct/s e_CRhard 1-sigma error of hard count rate
64- 69 F6.3 --- HR1 Hardness ratio HR1 (G1)
71- 76 F6.4 --- e_HR1 1-sigma error of hardness ratio HR1
78- 83 F6.3 --- HR2 Hardness ratio HR2 (G1)
85- 89 F5.3 --- e_HR2 1-sigma error of hardness ratio HR2
91- 93 F3.1 10+20cm-2 NHgal Galactic column density of H, 21-cm
95-100 F6.3 10+20cm-2 NHLMCrad LMC column density of H, 21-cm
102-103 A2 --- l_NHLMCX [<≥ ~] Limit flag on LMC NH, X-ray
105-109 F5.2 10+20cm-2 NHLMCX ? LMC NH, X-ray. value (or lower bound)
110 A1 --- u_NHLMCX [?] Uncertainty flag on NHLMCXray
111-114 F4.1 10+20cm-2 E_NHLMCX ? LMC NH, X-ray, +1-sigma error
117-120 F4.1 10+20cm-2 e_NHLMCX ? LMC NH, X-ray, -1-sigma error
122-123 I2 10+20cm-2 uNHLMCX ? LMC NH, X-ray, upper bound
125-136 A12 --- Class Source classification
138-144 A7 --- Refs References, separated by commas, detailed
in refs.dat file
146-156 A11 --- Notes Notes, separated by commas, explicited
in notes.dat file
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Note [1/73] Note code number
4- 97 A94 --- Text Text of the note
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1 A1 --- Ref [a-t] Reference code
3- 21 A19 --- BibCode BibCode
23- 46 A24 --- Aut Author's name
48- 68 A21 --- Com Comments
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number
4- 6 I3 --- ID Catalog index number (1)
8- 18 A11 --- RX Source ROSAT name (HHMM.M+DDMM, J2000)
20- 21 I2 h RAh Right ascension (J2000.0)
23- 24 I2 min RAm Right ascension (J2000.0)
26- 29 F4.1 s RAs Right ascension (J2000.0)
31 A1 --- DE- Declination sign (J2000.0)
32- 33 I2 deg DEd Declination (J2000.0)
35- 36 I2 arcmin DEm Declination (J2000.0)
38- 39 I2 arcsec DEs Declination (J2000.0)
41- 45 F5.1 arcsec r90 Positional error (90% confidence)
47- 54 F8.3 10-3ct/s CR Total count rate
56- 61 F6.3 10-3ct/s e_CR 1-sigma error of total count rate
63- 69 F7.4 --- HR1 Hardness ratio HR1 (G1)
71- 76 F6.4 --- e_HR1 1-sigma error of hardness ratio HR1
78- 83 F6.3 --- HR2 Hardness ratio HR2 (G1)
85- 89 F5.3 --- e_HR2 1-sigma error of hardness ratio HR2
91- 93 I3 arcsec Ext ? Source extension
95- 99 I5 --- LIexi Existence likelihood
101-102 I2 arcmin Offaxis ? Off-axis angle
104-106 I3 --- [HP99] ? Catalog index, Haberl & Pietsch (1999,
Cat. J/A+AS/139/277)
108-109 I2 arcsec Dist ? Distance to source, Haberl & Pietsch
(1999, Cat. J/A+AS/139/277)
111-113 A3 --- Class Source class (3)
115-161 A47 --- Remarks Remark to source (2)
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Note (1): Catalog index number of the "master catalog" resulting from
Source Detection.
Note (2): References:
[SHP] Sasaki, Haberl & Pietsch, 2000, Cat. J/A+AS/143/391
[1] Schmidt-Kaler et al., 1999, Cat. J/MNRAS/306/279
[2] Gochermann et al., 1993, Cat.J/A+AS/99/591
[3] Rebeirot et al., 1983A&AS...51..277R 1983A&AS...51..277R
[4] Grothues et al., 1997, Cat. J/A+AS/121/247
[5] Kontizas et al. 1990, Cat. VII/183
[6] Reynolds et al. 1999, Cat. J/A+AS/134/287
[7] Reid et al. 1990, Cat. J/ApJ/348/98
[8] Thompson et al., 1998, Cat. J/AJ/115/2587
Note (3): the classification is
A = AGN
B = X-ray binary
R = supernova remnant
F = foreground star
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Global notes:
Note (G1): Hardness ratios:
HR1 = (Hard-Soft)/(Hard+Soft)
HR2 = (Hard2-Hard1)/(Hard1+Hard2)
where Soft = (channel 11- 41, 0.1-0.4keV),
Hard = (channel 52-201, 0.5-2.0keV),
Hard1 = (channel 52- 90, 0.5-0.9keV),
Hard2 = (channel 91-201, 0.9-2.0keV).
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Acknowledgements: Peter Kahabka
References:
Kahabka et al., Paper I 2001A&A...371..816K 2001A&A...371..816K
Kahabka et al., Paper III 2002A&A...388..113K 2002A&A...388..113K
(End) Patricia Bauer [CDS] 22-Apr-2002