期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 414, 期 2, 页码 1329-1338出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2011.18466.x
关键词
galaxies: individual: M82; X-rays: binaries; X-rays: galaxies
资金
- National Science Council of the Republic of China (Taiwan) [NSC96-2112-M-007-037-MY3]
We investigate the long-term variability exhibited by the X-ray point sources in the starburst galaxy M82. By combining nine Chandra observations taken between 1999 and 2007, we detect 58 X-ray point sources within the D-25 isophote of M82 down to a luminosity of similar to 10(37) erg s(-1). Of these 58 sources, we identify three supernova remnant candidates and one supersoft source. 26 sources in M82 exhibit long-term (i.e. days to years) flux variability and three show long-term spectral variability. Furthermore, we classify 26 sources as variables and 10 as persistent sources. Among the total 26 variables, 17 varied by a flux ratio of >3 and six are transient candidates. By comparing with other nearby galaxies, M82 shows extremely strong long-term X-ray variability that 47 per cent of the X-ray sources are variables with a flux ratio of >3. The strong X-ray variability of M82 suggests that the population is dominated by X-ray binaries.
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