J/ApJ/636/200 XMM-Newton LMXB in NGC4649 (Randall+, 2006)
XMM-Newton observation of diffuse gas and low-mass X-ray binaries in the
elliptical galaxy NGC 4649 (M60).
Randall S.W., Sarazin C.L., Irwin J.A.
<Astrophys. J., 636, 200-213 (2006)>
=2006ApJ...636..200R 2006ApJ...636..200R
ADC_Keywords: Binaries, X-ray
Keywords: binaries: close - galaxies: elliptical and lenticular, cD -
galaxies: ISM - X-rays: binaries - X-rays: galaxies - X-rays: ISM
Abstract:
We present an XMM-Newton X-ray observation of the X-ray bright E2
elliptical galaxy NGC 4649. In addition to bright diffuse emission, we
resolve 158 discrete sources, ∼50 of which are likely to be LMXBs
associated with NGC 4649.
Description:
NGC 4649 was observed on 2001 January 2 for 53,867 s with the thin
filter in place and with each EPIC instrument in full frame mode.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 146 47 Discrete X-ray sources
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See also:
J/ApJ/600/729 : Chandra LMXB in NGC 4649 (Randall+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- [RSI2006] Source number
4- 8 A5 --- --- [XMMJJ]
10- 24 A15 --- XMMJJ Source IAU name (HHMMSS.s+DDMMSS)
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)
37 A1 --- DE- Sign of the Declination (J2000.0)
38- 39 I2 deg DEd Degree of Declination (J2000.0)
41- 42 I2 arcmin DEm Arcminute of Declination (J2000.0)
44- 47 F4.1 arcsec DEs Arcsecond of Declination (J2000.0)
49- 54 F6.2 arcsec Dist Projected distance from NGC 4649 center
56- 63 F8.2 10-4ct/s CR The 0.3-12.0keV total count rate (1)
65- 69 F5.2 10-4ct/s e_CR The 1σ error in CR
71- 76 F6.2 --- S/N Signal-to-noise ratio for the count rate
78- 84 F7.2 10+31W LX X-ray luminosity in the 0.3-12.0keV band
(in units of 1038ergs/s)
86- 90 F5.2 --- H21 Hardness ratio, (M-S)/(M+S) (2)
92- 95 F4.2 --- E_H21 Upper limit error in H21
97-100 F4.2 --- e_H21 Lower limit error in H21
102-106 F5.2 --- H31 Hardness ratio, (H-S)/(H+S) (2)
108-111 F4.2 --- E_H31 Upper limit error in H31
113-116 F4.2 --- e_H31 Lower limit error in H31
118-121 A4 --- PN PN camera band (SMHT) detection flag (3)
123-126 A4 --- M1 MOS1 camera band (SMHT) detection flag (3)
128-131 A4 --- M2 MOS2 camera band (SMHT) detection flag (3)
133-146 A14 --- Notes Individual notes (4)
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Note (1): Combined rate for all chips on which the source was not on
a chip gap or bad column.
Note (2): S, M, and H are the net counts in the soft (0.3-1keV),
medium (1-2keV), and hard (2-12keV) bands, respectively.
Note (3): Indicate which of the four energy bands (Soft, Medium, Hard, and
Total) each source was detected in for each instrument, where a
source is considered to be "detected" if the S/N in that energy
band is at least 3.
Note (4): Notes, numbered as follows:
1 = Source 1 is extended and appears to be a combination of diffuse
structure with one or more point sources.
2 = Source is near a chip gap or bad column on one or more instruments.
Position and count rate may be inaccurate.
3 = Possible Chandra X-ray counterpart.
4 = May be a blend of two Chandra sources.
5 = Globular cluster is possible optical counterpart.
6 = Source may be variable.
7 = May be associated with the companion galaxy NGC 4647.
8 = Possible faint optical counterpart.
9 = Source was not visible on the PN camera due to a chip gap or bad
column.
10 = Possible USNO-B1.0 (Cat. I/284) optical counterpart.
11 = Possible 2MASS (Cat. II/246) near-infrared counterpart.
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History:
From electronic version of the journal
(End) Marianne Brouty [CDS] 28-Dec-2006