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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
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) 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) 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) 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.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Nov-2006
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