J/A+A/447/71 CHANDRA X-ray point sources in Cen A (NGC 5128) (Voss+, 2006)
The luminosity function of X-ray point sources in Centaurus A.
Voss R., Gilfanov M.
<Astron. Astrophys., 447, 71-80 (2006)>
=2006A&A...447...71V 2006A&A...447...71V
ADC_Keywords: X-ray sources
Keywords: galaxies: individual: Centaurus A - X-rays: binaries -
X-rays: galaxies
Abstract:
We have studied the X-ray point source population of Centaurus A
(NGC 5128) using data from four archival CHANDRA observations. We
detected 272 point-like X-ray sources within a radius of 10' from the
centre. Approximately half of these are CXB sources, with the
remaining half being LMXBs. The spatial distribution of the LMXBs,
both azimuthally averaged and 2D, is consistent with the distribution
of the K-band light observed in the 2MASS survey. After correction for
the incompleteness effect we constrain the LMXB luminosity function
down to ∼2x1036erg/s, much lower than previous studies of LMXBs in
elliptical galaxies.
Description:
The analysis in this paper is based on four CHANDRA observations, two
of them made with the ACIS-I array (OBS-ID 316 and 962), and the other
two with the ACIS-S array (OBS-ID 2978 and 3965).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 105 272 The list of point-like X-ray sources within
r<10' from the center of Cen A
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See also:
J/A+A/369/812 : UVKs photometry of NGC 5128 globular clusters (Rejkuba, 2001)
J/ApJ/560/675 : Chandra X-ray point sources in Cen A (Kraft+, 2001)
J/AJ/128/712 : Washington Photometry in NGC 5128 (Harris+, 2004)
J/AJ/128/723 : Washington Photometry in NGC 5128. II (Harris+, 2004)
J/ApJS/150/367 : Globular clusters in NGC 5128 (Peng+, 2004)
J/ApJ/600/716 : NGC 5128 Chandra X-ray point sources (Minniti+, 2004)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [VG2006] Sequential number
5- 8 A4 --- --- [CXOU]
10- 25 A16 --- CXOU CXOU designation (JHHMMSS.s-DDMMSS) (1)
27- 31 F5.1 arcsec Dist Distance from the center
33- 34 I2 h RAh Right ascension (J2000)
36- 37 I2 min RAm Right ascension (J2000)
39- 42 F4.1 s RAs Right ascension (J2000)
44 A1 --- DE- Declination sign (J2000)
45- 46 I2 deg DEd Declination (J2000)
48- 49 I2 arcmin DEm Declination (J2000)
51- 54 F4.1 arcsec DEs Declination (J2000)
56- 59 I4 ct TCts Total number of counts in the WAVDETECT
source cell, source+background
61- 66 F6.1 ct SCts Number of source counts after background
subtraction
68- 71 F4.1 ct e_SCts rms uncertainty on SCts
73- 80 E8.3 10-7W LX X-ray luminosity, 0.5-8keV, assuming 3.5kpc
distance
82- 89 A8 --- Type Source type (2)
91-102 A12 --- OName Precise identification and reference (3)
105 A1 --- n_CXOU [*] individual notes (4)
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Note (1): CXO source name, according to the CHANDRA-discovered
source naming convention
Note (2): Source type as follows:
GC = confirmed globular cluster
FS = foreground star
GAL = background galaxy
Hα = Hα emmitter
Note (3): Precise identification and reference:
pff = Peng et al. (2004, Cat. J/ApJS/150/367), Tables 5 and 9
[PFF2004] gc NNN and [PFF2004] wd N in Simbad
mrfa = Minniti et al. (2003, Cat. J/ApJ/600/716), Tables 1 and 3
[MRF2004] NNN in Simbad
whh = Woodley et al. (2005AJ....129.2654W 2005AJ....129.2654W) Tables 1 and 2
[WHH2005] NNN in Simbad for numbers 8, 17 and 22
[HHG2004] NNN in Simbad for numbers 317
GF = Graham & Fasset (2002ApJ...575..712G 2002ApJ...575..712G) Table 1
[GF2002] Blue NN in Simbad
Kraft = Kraft et al. (2001, Cat. J/ApJ/560/675) Sect. 5.1
[KKF2001] 25 in Simbad
HD = Roeser et al. (1991, Cat. III/155)
Note (4): Individual notes:
-- Source #121 was designated a globular cluster by Minniti et al.
(2003, Cat. J/ApJ/600/716), but according to Woodley et al.
(2005AJ....129.2654W 2005AJ....129.2654W) it is a background galaxy; Minniti et al.
(2003, Cat. J/ApJ/600/716) claim to have removed sources with
Hα-emission from their list of globular clusters. However two
sources (#54 and #108 in our source list) are both listed as
Hα-emitters and globular clusters in their tables. We assume
that they are Hα sources and designate them accordingly.
-- Sources #146, #148 and #197 are included in the list of globular
clusters of Minniti et al. (2003, Cat. J/ApJ/600/716), although
no colours are available. They are marked as globular cluster in
the table.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Nov-2006