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J/ApJ/599/218       Chandra LMXB in NGC 4365 and NGC 4382    (Sivakoff+, 2003)

Chandra observations of low-mass X-ray binaries and diffuse gas in the early-type galaxies NGC 4365 and NGC 4382 (M85). Sivakoff G.R., Sarazin C.L., Irwin J.A. <Astrophys. J., 599, 218-236 (2003)> =2003ApJ...599..218S
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 used the Chandra X-Ray Observatory ACIS-S3 to image the X-ray-faint elliptical galaxy NGC 4365 and lenticular galaxy NGC 4382. The observations resolve much of the X-ray emission into 99 and 58 sources, respectively, most of which are low-mass X-ray binaries (LMXBs) associated with each of the galaxies. Within one effective radius of NGC 4365, about 45% of the counts are resolved into sources, 30% are attributed to unresolved LMXBs, and 25% are attributed to diffuse gas. Within two effective radii of NGC 4382, about 22% of the counts are resolved into sources, 33% are attributed to unresolved LMXBs, and 45% are attributed to diffuse gas. We identify 18 out of the 37 X-ray sources in a central field in NGC 4365 with globular clusters. Description: NGC 4365 was observed on 2001 June 23 with a live exposure of 40429s, while NGC 4382 was observed on 2001 May 29-30 for 39749s. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 118 99 Discrete X-Ray Sources in NGC 4365 table2.dat 116 58 Discrete X-Ray Sources in NGC 4382 (M85)
See also: V/113 : Cataclysmic Binaries, LMXBs, & related objects (Ritter+, 2003) J/ApJ/600/729 : Chandra LMXB in NGC 4649 (Randall+, 2004) Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [SSI2003b] Sequential number (1) 4- 7 A4 --- --- [CXOU] 9- 24 A16 --- CXOU CXOU designation (JHHMMSS.s+DDMMSS) 26- 27 I2 h RAh Right ascension (J2000) 29- 30 I2 min RAm Right ascension (J2000) 32- 36 F5.2 s RAs Right ascension (J2000) 38 A1 --- DE- Declination sign (J2000) 39- 40 I2 deg DEd Declination (J2000) 42- 43 I2 arcmin DEm Declination (J2000) 45- 48 F4.1 arcsec DEs Declination (J2000) 50- 54 F5.1 arcsec Dist Distance from the center of the galaxy 56- 61 F6.2 10-4s-1 CRate X-ray Count rate 63- 66 F4.2 10-4s-1 e_CRate rms uncertainty on CRate 68- 72 F5.2 --- S/N signal-to-noise ratio 74- 79 F6.2 10+30W LX X-ray luminosity in the 0.3-10keV band 81- 85 F5.2 --- H21 Hardness ratio, (M-S)/(M+S) (2) 87- 90 F4.2 --- E_H21 Error on H21 (Upper limit) 92- 95 F4.2 --- e_H21 Error on H21 (Lower limit) 97-101 F5.2 --- H31 Hardness ratio, (H-S)/(H+S) (2) 103-106 F4.2 --- E_H31 Error on H31 (Upper limit) 108-111 F4.2 --- e_H31 Error on H31 (Lower limit) 113-115 A3 --- Notes Individual notes (3)
Note (1): [SSI2003b] NGC 4365 NN in table1, [SSI2003b] NGC 4382 NN in table2. Note (2): S, M, and H are the total counts in the soft (0.3-1keV), medium (1-2keV), and hard (2-10keV) bands, respectively. Note (3): Notes are the following: 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: Possible faint optical counterpart. d: Globular cluster is possible optical counterpart. e: Source may be variable. f: Source is at the edge of the S3 detector, and flux is uncertain as a result of large exposure correction. g: Identified with known AGN.
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 05-Feb-2004
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