A relativistic jet from Cygnus X-1 in the low/hard X-ray state

被引:309
作者
Stirling, AM [1 ]
Spencer, RE
de la Force, CJ
Garrett, MA
Fender, RP
Ogley, RN
机构
[1] Univ Cent Lancashire, CFA, Preston PR1 2HE, Lancs, England
[2] Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England
[3] Joint Inst VLBI Europe, NL-7990 AA Dwingeloo, Netherlands
[4] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands
[5] Univ Amsterdam, Ctr High Energy Astrophys, NL-1098 SJ Amsterdam, Netherlands
[6] Univ Keele, Dept Phys, Keele ST5 5BG, Staffs, England
关键词
binaries : close; stars : individual : Cygnus X-1; ISM : jets and outflows;
D O I
10.1046/j.1365-8711.2001.04821.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the detection of a radio-emitting jet from the black hole candidate and X-ray binary source Cygnus X-1. Evidence of a bright core with a slightly extended structure was found on milliarcsecond resolution observations with the Very Long Baseline Array (VLBA) at 15.4 GHz. Later observations with the VLBA [and including the phased-up, Very Large Array (VLA)] at 8.4 GHz show an extended jet-like feature extending to similar to 15 mas from a core region, with an opening angle of < 2<degrees>. In addition, lower resolution MERLIN observations at 5 GHz show that the source has < 10 per cent linear polarization. The source was in the low/hard X-ray state during the observations, and the results confirm the existence of persistent radio emission from an unresolved core and a variable, relativistic (> 0.6c) jet during this state.
引用
收藏
页码:1273 / 1278
页数:6
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