J/ApJ/617/262 X-ray sources in NGC 1600 (Sivakoff+, 2004)
Chandra observations of diffuse gas and luminous X-ray sources around the
X-ray-bright elliptical galaxy NGC 1600.
Sivakoff G.R., Sarazin C.L., Carlin J.L.
<Astrophys. J., 617, 262-280 (2004)>
=2004ApJ...617..262S 2004ApJ...617..262S
ADC_Keywords: X-ray sources
Keywords: galaxies: elliptical and lenticular, cD ; galaxies: ISM -
intergalactic medium - X-rays: binaries - X-rays: galaxies -
X-rays: ISM
Abstract:
We observed the X-ray-bright E3 galaxy NGC 1600 and nearby members of
the NGC 1600 group with the Chandra X-Ray Observatory ACIS-S3 to study
their X-ray properties. Unresolved emission dominates the observation;
however, we resolved some of the emission into 71 sources, most of
which are low-mass X-ray binaries associated with NGC 1600. Twenty-one
of the sources have LX>2x1039ergs/s (0.3-10.0keV; assuming they
are at the distance of NGC 1600), marking them as ultraluminous X-ray
point source (ULX) candidates; we expect that only 11±2 are
unrelated foreground/background sources.
Description:
NGC 1600 was observed in two intervals on 2002 September 18-19 and
September 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 144 71 Discrete X-Ray sources in NGC 1600
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- [SSC2004b] Source identification
4- 7 A4 --- --- [CXOU]
9- 24 A16 --- CXOU IAU name (CXOU JHHMMSS.S+DDMMSS in Simbad)
26- 27 I2 h RAh Hour of Right Ascension (J2000.0)
29- 30 I2 min RAm Minute of Right Ascension (J2000.0)
32- 36 F5.2 s RAs Second of Right Ascension (J2000.0)
38 A1 --- DE- Sign of the Declination (J2000.0)
39- 40 I2 deg DEd Degree of the Declination (J2000.0)
42- 43 I2 arcmin DEm Arcminute of the Declination (J2000.0)
45- 48 F4.1 arcsec DEs Arcsecond of the Declination (J2000.0)
50- 54 F5.1 arcsec Dist Projected radial distance from the center
of NGC 1600
56- 60 F5.1 arcsec a Semimajor distance from the center of
NGC 1600
62- 67 F6.2 10-4ct/s CR Wavdetect count rate
69- 72 F4.2 10-4ct/s e_CR Error on CR
74- 78 F5.2 --- S/N S/N for the count rate
80- 85 F6.2 10+31W LX X-ray luminosity in units of 1038erg/s
87- 91 F5.2 --- HR210 Intrinsic hardness ratio HR21 (1)
93- 96 F4.2 --- E_HR210 Upper error limit on HR210
98-101 F4.2 --- e_HR210 Lower error limit on HR210
103-107 F5.2 --- HR310 Intrinsic hardness ratio HR31 (1)
109-112 F4.2 --- E_HR310 Upper error limit on HR310
114-117 F4.2 --- e_HR310 Lower error limit on HR310
119-123 F5.2 --- HR320 Intrinsic hardness ratio HR32(1)
125-128 F4.2 --- E_HR320 Upper limit error on HR320
130-133 F4.2 --- e_HR320 Lower limit error on HR320
135-143 A9 --- Notes Notes (2)
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Note (1): We define three hardness ratios:
H210=(M0-S0)/(M0+S0),
H310=(H0-S0)/(H0+S0) and
H320=(H0-M0)/(H0+M0),
where S0, M0 and H0 are the total counts in the soft (0.3-1keV),
medium (1-2keV), and hard (2-6keV) bands, respectively, corrected for
the effect of Galactic absorption.
Note (2): Notes, defined as follows:
a = Sources near the center may be confused with nearby sources, making
their positions, fluxes, and extents uncertain.
b = Source is noticeably more extended than PSF.
c = Source is at the edge of the S3 detector, and flux is uncertain because
of large exposure correction.
d = Possible optical counterpart.
e = Source may be variable.
f = Source is part of analysis sample.
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History:
From electronic version of the journal
(End) Marianne Brouty [CDS] 22-Jun-2005