J/MNRAS/344/134 Chandra ultraluminous X-ray sources (Humphrey+, 2003)
Ultraluminous X-ray source populations in normal galaxies:
a preliminary survey with Chandra.
Humphrey P.J., Fabbiano G., Elvis M., Church M.J., Balucinska-Church M.
<Mon. Not. R. Astron. Soc. 344, 134 (2003)>
=2003MNRAS.344..134H 2003MNRAS.344..134H
ADC_Keywords: X-ray sources
Keywords: accretion, accretion discs - black hole physics - binaries: close -
X-rays: galaxies - X-rays: stars
Abstract:
We present results of a Chandra survey of the ultraluminous X-ray
sources (ULX) in 13 normal galaxies, in which we combine source
detection with X-ray flux measurement. 22 ULX were detected, i.e. with
LX>1039erg/s (L10) and 39 other sources were detected with
LX>5x1038erg/s (L5). We also use radial intensity profiles to
remove extended sources from the sample. The majority of sources are
not extended, which for a typical distance constrains the emission
region size to less than 50pc. X-ray colour-colour diagrams and
spectral fitting results were examined for indicators of the ULX
nature. In the case of the brighter sources, spectral fitting
generally requires two-component models. In only a few cases do
colour-colour diagrams or spectral fitting provide evidence of a black
hole nature. We find no evidence of a correlation with stellar mass,
however, there is a strong correlation with star formation as
indicated by the 60-m flux as found in previous studies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table12.dat 142 13 Galaxy sample and Chandra observation log and
preferred values of distances of each galaxy
table3.dat 100 13 The numbers of bright sources detected
table4.dat 83 61 ULX detections, possible ULX detections and
Other super-Eddington detections
table5.dat 70 10 The extended source L5 detections
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See also:
B/chandra : The Chandra Archive Log (CXC, 2002)
J/ApJS/143/25 : Intermediate-luminosity X-ray objects catalog (Colbert+ 2002)
J/A+A/429/1125 : Ultraluminous X-ray sources catalog (Liu+, 2005)
Byte-by-byte Description of file: table12.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Galaxy name
10- 13 A4 --- MType Morphological type
15- 18 F4.1 --- TType ? T morphological type
20- 23 F4.1 mag BTmag ? Total B0 magnitude
25- 29 F5.2 arcmin D25 ? B-band 25th magnitude isophote
31- 33 F3.1 10+20/cm2 NH Line-of-sight H column density within our
galaxy for the centroid of each external
galaxy
35- 38 I4 --- Obs Observation identification number
40- 49 A10 "DD/MM/YYYY" Date Observation date
52- 55 F4.1 ks Exp exposition time
57- 61 F5.1 pc Resln Minimum resolvable size scale (equivalent
to 0.5arcsec) using our best distances for
63- 66 F4.1 Mpc Dist Distance
68- 70 F3.1 Mpc e_Dist ? rms uncertainty on Dist
73- 82 A10 --- Techn Technique used to the distance
determination (1)
84-102 A19 --- r_Dist BibCode of the distance reference
104-121 A18 --- Aut Author's name for the reference
123-142 A20 --- Com Commnents of the reference
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Note (1): Technique used to the distance determination are the following:
BS: Brightest stars in galaxies
SBF: I-band surface brightness fluctuation
T-F: Tully-Fischer relation
Vvir: Redshift distances with Virgocentric correction
Cepheid: Cepheid
DN-sigma: Isophotal diameter velocity dispersion
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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- 8 A8 --- Name Galaxy name
11- 14 F4.1 Mpc Dist Distance of the galaxy
16- 18 F3.1 Mpc e_Dist rms uncertainty on Dist
21 A1 --- l_N2 Limit flag on N2
22- 25 F4.1 --- N2 Number of sources with L>2x1038erg/s
(N2tot=158±13)
27- 31 F5.2 --- e_N2 ? rms uncertainty on N2
33- 40 E8.2 --- N2bkg Expected number of background sources
with L>2x1038erg/s (N2bkgtot=40.9)
42 A1 --- l_N5 Limit flag on N5
43- 46 F4.1 --- N5 Number of sources with L>5x1038erg/s
(N5tot=61±6)
48- 51 F4.2 --- e_N5 ? rms uncertainty on N5
54- 60 E7.2 --- N5bkg Expected number of background sources
with L>5x1038erg/s (N5bkgtot=16.6)
62 A1 --- l_N10 Limit flag on N10
63- 67 F5.2 --- N10 Number of sources with L>1039erg/s, ULX
(N10tot=22±4)
69- 71 F3.1 --- e_N10 ? rms uncertainty on N10
73- 80 E8.3 --- N10bkg Expected number of background sources
with L>1039erg/s (N10bkgtot=8.40)
82 I1 --- N100 Number of sources with L>1040erg/s
(N100tot=2)
84- 91 E8.3 --- N100bkg Expected number of background sources
with L>1040erg/s (N100bkgtot=1.0)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1 A1 --- Type [UPO] U: ULX,
P: Possible ULX detections,
O: Other super-Eddington detections
3- 10 A8 --- Name Galaxy name
12- 17 A6 --- PSX PSX source designation in the galaxy (1)
19- 22 A4 --- --- [CXOU] CXOU
24- 39 A16 --- CXOU CXOU designation (JHHMMSS.s+DDMMSS, J2000)
42- 45 I4 ct Count X-ray Count
47- 51 F5.2 10-3ct/s Rate X-ray Count Rate
54- 58 F5.1 10+31W L(0.3-7.0) Luminosity in the 0.3-7.0keV band,
in 1038erg/s
60- 64 F5.1 10+31W E_L(0.3-7.0) Error in L(0.3-7.0), upper limit
67- 70 F4.1 10+31W e_L(0.3-7.0) Error in L(0.3-7.0), lower limit
74- 76 I3 arcsec DR Offset from the centre of the galaxy
78 A1 --- Flag [±] Flag (2)
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Note (1): The sources are identified as [HFE2003] NGC NNNN PSX NN,
[HFE2003] IZW18 PSX N, and [HFE2003] IC 2574 PSX N in Simbad
Note (2): The sources classified as "ULX detections", in which the errors
would allow the luminosity to fall just below L10 are marked '-'.
The sources classified as "Possible ULX detections", with luminosity
close to L10 in which the luminosity errors would allow one to join
the ULX category are marked '+'.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Galaxy name
10- 15 A6 --- ESX ESX source designation in the galaxy (1)
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 25 F4.1 s RAs Right ascension (J2000)
27 A1 --- DE- Declination sign (J2000)
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 35 I2 arcsec DEs Declination (J2000)
38- 42 I5 ct Count X-ray Count
44- 48 F5.1 10-3ct/s Rate X-ray Count Rate
50- 54 F5.1 10+31W L(0.3-7.0) Luminosity in the 0.3-7.0keV band,
in 1038erg/s
56- 60 F5.1 10+31W E_L(0.3-7.0) Error in L(0.3-7.0), upper limit
62- 65 F4.1 10+31W e_L(0.3-7.0) Error in L(0.3-7.0), lower limit
68- 70 F3.1 arcsec DR Offset from the centre of the galaxy
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Note (1): The sources are identified as [HFE2003] NGC NNNN ESX NN in Simbad.
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 25-Sep-2003