J/ApJ/662/525 LMXBs in globular clusters of 5 galaxies (Kundu+, 2007)
Probing the formation of low-mass X-ray binaries in globular clusters and
the field.
Kundu A., Maccarone T.J., Zepf S.E.
<Astrophys. J., 662, 525-543 (2007)>
=2007ApJ...662..525K 2007ApJ...662..525K
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; X-ray sources ; Photometry
Keywords: galaxies: general - galaxies: star clusters -
globular clusters: general - X-rays: binaries - X-rays: galaxies
Abstract:
We present an analysis of LMXBs and GCs in five early-type galaxies
using Chandra X-ray and HST optical data. Of the 186 LMXBs within the
optical fields of view, 71 are in GCs, confirming that LMXBs are
formed particularly efficiently in clusters due to dynamical
interactions.
Description:
We have analyzed archival Chandra ACIS-S3 images of five early-type
galaxies, NGC 1399, NGC 3115, NGC 3379, NGC 4594, and NGC 4649.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 63 175 NGC 1399 X-ray binaries
table3.dat 61 554 NGC 1399 globular clusters
table4.dat 71 24 NGC 1399 LMXB-GC candidates
table5.dat 63 86 NGC 3115 X-ray binaries
table6.dat 61 133 NGC 3115 globular clusters
table7.dat 71 9 NGC 3115 LMXB-GC candidates
table8.dat 63 71 NGC 3379 X-ray binaries
table9.dat 61 61 NGC 3379 globular clusters
table10.dat 71 7 NGC 3379 LMXB-GC candidates
table11.dat 63 141 NGC 4594 X-ray binaries
table12.dat 61 193 NGC 4594 globular clusters
table13.dat 71 15 NGC 4594 LMXB-GC candidates
table14.dat 63 165 NGC 4649 X-ray binaries
table15.dat 61 418 NGC 4649 globular clusters
table16.dat 71 16 NGC 4649 LMXB-GC candidates
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Byte-by-byte Description of file: table[258].dat table1[14].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- XID Running X-ray identification number (1)
5 I1 --- f_XID [1,4]? Remark on XID (2)
7- 12 A6 --- --- [CXOKMZ]
14- 29 A16 --- CXOKMZ Chandra identification, JHHMMSS.s+SSMMSS
31- 32 I2 h RAh Hour of Right Ascension (J2000)
34- 35 I2 min RAm Minute of Right Ascension (J2000)
37- 41 F5.2 s RAs Second of Right Ascension (J2000)
43 A1 --- DE- Sign of the declination (J2000)
44- 45 I2 deg DEd Degree of Declination (J2000)
47- 48 I2 arcmin DEm Arcminute of Declination (J2000)
50- 53 F4.1 arcsec DEs Arcsecond of Declination (J2000)
55- 61 E7.2 10-7W LX Observed X-ray luminosity in erg/s
63 A1 --- HST [YN] Source within the HST field-of-view?
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Note (1): Sources identified as [KMZ2007] NGC NNNN X NNN in Simbad.
Note (2): Flag as follows:
1 = Nuclear source
2 = Optical counterparts outside the typical color range
of globular clusters
3 = Likely optical counterpart on the edge of the WFPC2 chip
4 = Likely associated with the nearby companion spiral galaxy NGC 4647
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Byte-by-byte Description of file: table[369].dat table1[25].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- OID Running optical identification number (1)
5 I1 --- f_OID [1,2]? Source too close to center (2)
7- 8 I2 h RAh Hour of Right Ascension (J2000)
10- 11 I2 min RAm Minute of Right Ascension (J2000)
13- 17 F5.2 s RAs Second of Right Ascension (J2000)
19 A1 --- DE- Sign of the declination (J2000)
20- 21 I2 deg DEd Degree of Declination (J2000)
23- 24 I2 arcmin DEm Arcminute of Declination (J2000)
26- 29 F4.1 arcsec DEs Arcsecond of Declination (J2000)
31- 35 F5.2 mag Bmag The B band magnitude
37- 40 F4.2 mag e_Bmag Uncertainty in Bmag
42- 46 F5.2 mag Imag The I band magnitude
48- 51 F4.2 mag e_Imag Uncertainty in Imag
53- 56 F4.2 mag B-I The (B-I) color index
58- 61 F4.2 mag e_B-I Uncertainty in B-I
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Note (1): Sources identified as [KMZ 2007] NGC NNNN GC NNN in Simbad.
Note (2): Flag as follows:
1 = Objects are within 8" of the center of the galaxy and are not
considered for the rest of the LMXB-GC analysis due to the high
X-ray background in this region.
Object 1 is the nucleus of the galaxy.
2 = Objects are within 10" of the center of the galaxy and are not
considered for the rest of the LMXB-GC analysis due to the high
X-ray background in this region
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Byte-by-byte Description of file: table[47].dat table1[036].dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [CXOKMZ]
8- 23 A16 --- CXOKMZ Chandra Name (JHHMMSS.s+DDMMSS)
25- 26 I2 --- XID X-ray identification number (1)
28- 30 I3 --- OID Optical identification number (2)
32- 39 E8.3 10-7W LX X-ray luminosity
41- 45 F5.2 mag Bmag B magnitude
47- 50 F4.2 mag e_Bmag rms uncertainty on Bmag
52- 56 F5.2 mag Imag I magnitude
58- 61 F4.2 mag e_Imag rms uncertainty on Imag
63- 66 F4.2 mag B-I B-I colour index
68- 71 F4.2 mag e_B-I rms uncertainty on B-I
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Note (1): As in tables 2, 5, 8, 11 and 14, respectively.
Note (2): As in tables 3, 6, 9, 12 and 15, respectively.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 13-May-2009