A 106 day period in the nuclear source X-8 in M33

被引：32
|
作者：
Dubus, G
Charles, PA
Long, KS
Hakala, PJ
机构：
[1] UNIV OXFORD, DEPT ASTROPHYS, OXFORD OX1 3RH, ENGLAND
[2] SPACE TELESCOPE SCI INST, BALTIMORE, MD 21218 USA
[3] UCL, MULLARD SPACE SCI LAB, DORKING RH5 6NT, SURREY, ENGLAND
来源：
ASTROPHYSICAL JOURNAL | 1997年 / 490卷 / 01期
基金：
美国国家航空航天局;
关键词：
galaxies; individual; (M33); nuclei; Local Group; X-rays; stars;
D O I：
10.1086/311013
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
With an X-ray luminosity of about 10(39) ergs s(-1), the source X-8, coincident with the optical center of M33, is the most luminous X-ray source in the Local Group. However its nature remains a mystery. We present here new and archival ROSAT observations of X-8 spread over 6 yr that show variability and a periodicity of similar to 106 days. This implies that (most of) the emission from M33 X-X arises from a single object, perhaps a binary system with a black hole primary of similar to 10 M.. We suggest that the companion is a giant orbiting with a period of similar to 10 days and that the observed modulation is ''superorbital,'' analogous to that seen in Cyg X-2 and X1820-30.
引用
收藏
页码：L47 / L50
页数：4
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