A luminous recurrent supersoft X-ray source in NGC 300

被引：35
作者：
Kong, AKH
Di Stefano, R
机构：
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] Tufts Univ, Dept Phys & Astron, Medford, MA 02155 USA
来源：
ASTROPHYSICAL JOURNAL | 2003年 / 590卷 / 01期
关键词：
galaxies : individual (NGC 300); X-rays : binaries; X-rays : galaxies;
D O I：
10.1086/376552
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the results of XMM-Newton observations for an especially luminous supersoft X-ray source (SSS) with a bolometric luminosity of 10(39) ergs s(-1) in the spiral galaxy NGC 300. The source was detected as an SSS in 1992 and disappeared in subsequent X-ray observations. The source was active again during recent XMM-Newton observations. It appeared to be very soft (kT similar to 60 eV) and very luminous (similar to10(38)-10(39) ergs s(-1)). The two XMM-Newton observations also reveal that the source went from a "high" state to a "low" state in 6 days. We also found a 5.4 hr periodicity during the low state. We consider white dwarf, black hole, and neutron star models in order to explain the nature of the source.
引用
收藏
页码：L13 / L16
页数：4
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