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J/ApJ/560/675       Chandra X-ray point sources in Cen A          (Kraft+, 2001)

Chandra observations of the X-ray point source population in Centaurus A. Kraft R.P., Kregenow J.M., Forman W.R., Jones C., Murray S.S. <Astrophys. J. 560, 675 (2001)> =2001ApJ...560..675K
ADC_Keywords: X-ray sources Keywords: galaxies: active - galaxies: individual (Centaurus A, NGC 5128) - X-rays: galaxies Abstract: We present results from two Chandra X-ray Observatory observations of the X-ray point source population in the nearby radio galaxy Centaurus A (NGC 5128). Using a wavelet decomposition detection algorithm, we detect 246 individual point sources above a limiting luminosity of ∼2*1036ergs/s, 82 of which are detected in both data sets where the fields of view overlap. Thirty-eight sources were detected in only one observation but were within the field of view of both pointings, implying considerable variability. We identify eight foreground stars in our observations. We also identify nine of the sources with known globular clusters in Centaurus A. All previously observed ROSAT sources within our field of view are detected. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 57 246 Summary of X-Ray point sources detected in Cen A observation
See also: J/ApJ/561/189 : Chandra X-ray sources in M101 (Pence+, 2001) J/ApJS/150/367 : Globular clusters in NGC 5128 (Peng+, 2004) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right Ascension (J2000) (1) 4- 5 I2 min RAm Right Ascension (J2000) 7- 11 F5.2 s RAs Right Ascension (J2000) 13 A1 --- DE- Sign of the Declination (J2000) 14- 15 I2 deg DEd Declination (J2000) 17- 18 I2 arcmin DEm Declination (J2000) 20- 24 F5.2 arcsec DEs Declination (J2000) 26 A1 --- l_Lum316 Limit flag on Lum316 (2) 27- 34 E8.3 10-7W Lum316 ? ACIS#316 (05-Dec-1999) 0.4-10keV luminosity in units of ergs/s (3) 36 A1 --- l_Lum962 Limit flag on Lum962 (2) 37- 44 E8.3 10-7W Lum962 ? ACIS#962 (17-May-2000) 0.4-10keV luminosity in units of ergs/s (3) 46- 56 A11 --- Notes Observation notes (4)
Note (1): Sources identified as [KKF2001] in Simbad Note (2): Indicates source was seen in the other observation but was within the FOV of this observation and thus reported luminosity is an upper limit based on a 3σ fluctuation in the background. Note (3): The source count rates were converted to a source luminosity assuming a distance of 3.5 Mpc to Cen A, and 5 keV bremsstrahlung spectrum with Galactic absorption (7*1020cm-2). Note (4): Identifications use the following conventions: fgs = foreground stars from the USNO A2.0 (Cat. I/252 catalog; GC = globular clusters (Harris et al. 1984ApJ...287..175H and Minitti et al. 1996ApJ...467..221M, [MAG95] NN in Simbad); PNN = previously observed by the ROSAT PSPC detector (Turner et al., 1997ApJ...475..118T, [TGM97] PNN in Simbad); HNN = previously observed by the ROSAT HRI detector (Turner et al., 1997ApJ...475..118T, [TGM97] HNN); SSS = super-soft source; stv = variable within one of the observations (see text); ltv = variable between the two observations (see text).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 14-Jan-2002
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