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J/ApJ/591/138       Chandra X-ray sources of NGC 1068        (Smith+, 2003)

A Chandra X-ray study of NGC 1068. II. The luminous X-ray source population. Smith D.A., Wilson A.S. <Astrophys. J., 591, 138-153 (2003)> =2003ApJ...591..138S
ADC_Keywords: Galaxies, Seyfert ; X-ray sources ; Binaries, X-ray Mission_Name: Chandra Keywords: accretion, accretion disks - galaxies: individual (NGC 1068) - galaxies: Seyfert - galaxies: starburst - X-rays: binaries Abstract: We present an analysis of the compact X-ray source population in the Seyfert 2 galaxy NGC 1068, imaged with a 50ks Chandra observation. We find a total of 84 compact sources on the S3 chip, of which 66 are located within the 25.0B-mag/arcsec2 isophote of the galactic disk of NGC 1068. Spectra have been obtained for the 21 sources with at least 50 counts and modeled with both multicolor disk blackbody and power-law models. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 107 84 Sources in the NGC 1068 field
See also: B/chandra : The Chandra Archive Log (CXC, 2002) J/ApJ/601/735 : M51 luminous X-ray sources (Terashima+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [CXOU] 6- 21 A16 --- [SW2003b] Source name 23- 24 I2 h RAh Hour of Right Ascension (J2000) 26- 27 I2 min RAm Minute of Right Ascension (J2000) 29- 33 F5.2 s RAs Second of Right Ascension (J2000) 35 A1 --- DE- Sign of the Declination (J2000) 36- 37 I2 deg DEd Degree of Declination (J2000) 39- 40 I2 arcmin DEm Arcminute of Declination (J2000) 42- 45 F4.1 arcsec DEs Arcsecond of Declination (J2000) 47 A1 --- l_CTot Limit flag on CTot 48- 53 F6.1 ct CTot The 0.4-5keV background subtracted counts 55 A1 --- f_CTot [f] Flag on CTot (1) 57- 60 F4.1 ct e_CTot ? Error in CTot (2) 62 A1 --- l_CSoft Limit flag on CSoft 63- 67 F5.1 ct CSoft The 0.4-1.5keV background subtracted counts 69 A1 --- f_CSoft [f] Flag on CSoft (1) 71- 74 F4.1 ct e_CSoft ? Error in CSoft (2) 76 A1 --- l_CHard Limit flag on CHard 77- 82 F6.1 ct CHard The 1.5-5keV background subtracted counts 84 A1 --- f_CHard [f] Flag on CHard (1) 86- 89 F4.1 ct e_CHard ? Error in CHard (2) 91 A1 --- l_HR Limit flag on HR 92- 96 F5.2 --- HR Hardness ratio, CHard/CSoft 98-101 F4.2 --- e_HR ? Error in HR 103-106 F4.1 [10-7W] logL Log of the 0.4-5keV luminosity in erg/s (3)
Note (1): Flag on counts 'f': Upper limits are calculated for a confidence level of 90%, using either a) equation (9) in Kraft, Burrows & Nousek (1991ApJ...374..344K) for instances when the total number of counts in the detection region is ≤20, or b) equation (3) in Gehrels (1986ApJ...303..336G), when the total number of counts is >20. The mean number of background counts was then subtracted from these calculated upper limits. Note (2): The errors are [σT2B2*(AT/AB)2]1/2 (e.g., Bevington & Robinson, 1992, Data Reduction and Error Analysis for the Physical Sciences (2d ed.; New York: McGraw-Hill) p. 41), where σB are the respective 1σ errors on the total and background counts, derived from equation (7) in Gehrels (1986ApJ...303..336G), and AT and AB are the respective areas of the source and background regions. Note (3): Corrected for Galactic absorption only, assuming that the source is in NGC 1068 (distance = 14.4Mpc) and the emission is isotropic.
History: From electronic version of the journal References: Young et al., Paper I 2001ApJ...556....6Y
(End) Patricia Vannier [CDS] 21-Feb-2005
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