J/A+A/533/A33 LMXBs detected in nearby galaxies (Zhang+, 2011)
Luminosity functions of LMXBs in different stellar environments.
Zhang Z., Gilfanov M., Voss R., Sivakoff G.R., Kraft R.P.,
Brassington N.J., Kundu A., Jordan A., Sarazin C.
<Astron. Astrophys., 533, A33 (2011)>
=2011A&A...533A..33Z 2011A&A...533A..33Z
ADC_Keywords: Clusters, globular ; Binaries, X-ray
Keywords: X-rays: binaries - globular clusters: general
Abstract:
Based on the archival data from the Chandra observations of nearby
galaxies, we study different sub populations of low-mass X-ray
binaries (LMXBs) - dynamically formed systems in globular clusters
(GCs) and in the nucleus of M 31 and (presumably primordial) X-ray
binaries in the fields of galaxies. Our aim is to produce accurate
luminosity distributions of X-ray binaries in different environments,
suitable for quantitative comparison with each other and with the
output of population synthesis calculations.
Our sample includes seven nearby galaxies (M 31, Maffei 1, Centaurus
A, M 81, NGC 3379, NGC 4697, and NGC 4278) and the Milky Way, which
together provide relatively uniform coverage down to the luminosity
limit of 1035erg/s. In total we have detected 185 LMXBs associated
with GCs, 35 X-ray sources in the nucleus of M 31, and 998 field
sources of which ∼365 are expected to be background AGN. We combine
these data, taking special care to accurately account for X-ray and
optical incompleteness corrections and the removal of the
contamination from the cosmic X-ray background sources, to produce
luminosity distributions of X-ray binaries in different environments
to far greater accuracy than has been obtained previously.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 28 93 The list of Chandra observations analyzed in
this paper
table6.dat 45 185 All the 185 LMXBs in globulars in our sample
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Gal Galaxy name (1)
10 A1 --- n_ObsID [*] Reference observation (2)
11- 14 I4 --- ObsID Chandra Obs-ID
16- 21 A6 --- Inst Instrument (ACIS-I or ACIS-S)
23- 28 F6.2 ks ExpTime Exposure time
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Note (1): M 31(1) is the bulge region and M 31(2) is the disk region.
Note (2): The observations marked by "*" were used as the reference when
combining the data.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
5- 12 A8 --- Gal Galaxy where source is detected
15- 16 I2 h RAh Source right ascension (J2000)
18- 19 I2 min RAm Source right ascension (J2000)
21- 25 F5.2 s RAs Source right ascension (J2000)
27 A1 --- DE- Source declination sign (J2000)
28- 29 I2 deg DEd Source declination (J2000)
31- 32 I2 arcmin DEm Source declination (J2000)
34- 38 F5.2 arcsec DEs Source declination (J2000)
40- 45 F6.2 10+29W LX X-ray luminosity in the 0.5-8keV band
(in units of 10+36erg/s)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Nov-2011