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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 57 246 Summary of X-Ray point sources detected in
Cen A observation
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): Sources identified as [KKF2001] JHHMMSS.ss+DDMMSS.ss 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 1984ApJ...287..175H and
Minitti et al. 1996ApJ...467..221M 1996ApJ...467..221M, [MAG95] NN in Simbad);
PNN = previously observed by the ROSAT PSPC detector
(Turner et al., 1997ApJ...475..118T 1997ApJ...475..118T, [TGM97] PNN in Simbad);
HNN = previously observed by the ROSAT HRI detector
(Turner et al., 1997ApJ...475..118T 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).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 14-Jan-2002