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J/ApJ/601/735       M51 luminous X-ray sources               (Terashima+, 2004)

The luminous X-ray source population in M51 observed with Chandra. Terashima Y., Wilson A.S. <Astrophys. J., 601, 735-758 (2004)> =2004ApJ...601..735T
ADC_Keywords: X-ray sources Keywords: accretion, accretion disks - galaxies: active - galaxies: individual (M51) - X-rays: binaries - X-rays: galaxies Abstract: We present the results of two Chandra observations (separated by 1yr) of the population of X-ray sources in the spiral galaxy M51 (NGC 5194 and NGC 5195). One hundred and thirteen X-ray sources have been detected in an 8.4'x8.4'(20.4x20.4kpc) region, and 84 and 12 of them project within the disks of NGC 5194 and NGC 5195, respectively. Nine and 28 sources have luminosities exceeding 1x1039erg/s (ultraluminous X-ray sources or ULXs) and 1x1038erg/s in the 0.5-8keV band, respectively, assuming that they are associated with M51. The number of ULXs is much higher than found in most normal spiral and elliptical galaxies. Most of the X-ray sources and all seven of the ULXs in NGC 5194 are located in, or close to, a spiral arm, suggesting a connection with recent star formation. Description: Chandra observations of M51 were performed on 2000 June 20 and 2001 June 23 with the ACIS instrument. The background was stable in both observations, and effective exposure times of 14.9 and 26.8ks were obtained for the observations in 2000 and 2001, respectively. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 153 84 Sources spatially coincident with NGC 5194 table3.dat 153 12 Sources spatially coincident with NGC 5195 table4.dat 153 17 Other sources
See also: B/chandra : The Chandra Archive Log (CXC, 2002) Byte-by-byte Description of file: table2.dat table3.dat table4.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [TW2004] Sequential number (1) 4- 5 I2 h RAh Right ascension (J2000.0) 7- 8 I2 min RAm Right ascension (J2000.0) 10- 14 F5.2 s RAs Right ascension (J2000.0) 16 A1 ---- DE- Declination sign (J2000.0) 17- 18 I2 deg DEd Declination (J2000.0) 20- 21 I2 arcmin DEm Declination (J2000.0) 23- 26 F4.1 arcsec DEs Declination (J2000.0) 28- 43 A16 --- CXOM51 Chandra designation 45- 50 F6.1 ct 0.5-8keV 0.5-8keV band counts in observations 1 & 2 52- 55 F4.1 ct e_0.5-8keV rms uncertainty on 0.5-8keV 57 A1 --- l_0.5-2keV Limit flag on 0.5-2keV 58- 63 F6.1 ct 0.5-2keV 0.5-2keV band counts in observations 1 & 2 65- 68 F4.1 ct e_0.5-2keV ? rms uncertainty on 0.5-2keV 70 A1 --- l_2-8keV Limit flag on 2-8keV 71- 76 F6.1 ct 2-8keV 2-8keV band counts in observations 1 & 2 78- 81 F4.1 ct e_2-8keV ? rms uncertainty on 2-8keV 83 A1 --- l_0.5-8keV1 Limit flag on 0.5-8keV1 84- 88 F5.1 ct 0.5-8keV1 0.5-8keV band counts in observation 1 90- 93 F4.1 ct e_0.5-8keV1 ? rms uncertainty on 0.5-8keV1 95 A1 --- l_0.5-2keV1 Limit flag on 0.5-2keV1 96-100 F5.1 ct 0.5-2keV1 0.5-2keV band counts in observation 1 102-105 F4.1 ct e_0.5-2keV1 ? rms uncertainty on 0.5-2keV1 107 A1 --- l_2-8keV1 Limit flag on 2-8keV1 108-112 F5.1 ct 2-8keV1 2-8keV band counts in observation 1 114-117 F4.1 ct e_2-8keV1 ? rms uncertainty on 2-8keV1 119 A1 --- l_0.5-8keV2 Limit flag on 0.5-8keV2 120-124 F5.1 ct 0.5-8keV2 0.5-8keV band counts in observation 2 126-129 F4.1 ct e_0.5-8keV2 ? rms uncertainty on 0.5-8keV2 131 A1 --- l_0.5-2keV2 Limit flag on 0.5-2keV2 132-136 F5.1 ct 0.5-2keV2 0.5-2keV band counts in observation 2 138-141 F4.1 ct e_0.5-2keV2 ? rms uncertainty on 0.5-2keV2 143 A1 --- l_2-8keV2 Limit flag on 2-8keV2 144-148 F5.1 ct 2-8keV2 2-8keV band counts in observation 2 150-153 F4.1 ct e_2-8keV2 ? rms uncertainty on 2-8keV2
Note (1): Source designations in Simbad: [TW2004] NGC 5194 NN in table2 [TW2004] NGC 5195 NN in table3 [TW2004] Source NN in table4
History: From electronic version of the journal
(End) James Marcout, Patricia Vannier [CDS] 06-Apr-2004
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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