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arXiv 0801.3150astro-ph
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gamma-ray双星LS I +61 303的多波长（射电、X射线和gamma-ray）观测

Multi-wavelength (radio, X-ray and gamma-ray) observations of the gamma-ray binary LS I +61 303

MAGIC Collaboration, J. Albert

备注：
Accepted for publication in The Astrophysical Journal, Part 1; 8 pages, 7 figures
发表信息：
Astrophys.J.684:1351-1358,2008
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摘要：

我们提出的第一个多波长观测活动的结果，在高质量的X射线二进制LS I +61 303，包括在TeV制度的观测与MAGIC望远镜，随着X射线观测与钱德拉，无线电干涉观测与MERLIN，EVN和VLBA阵列，在2006年10月和11月。从我们的MERLIN观测，我们可以排除存在大规模（~100 mas）持久的射电喷流。我们的5.0 GHz VLBA观测结果与以前在相同轨道相位进行的8.4 GHz VLBA观测结果显示出形态上的相似性，这表明无线电发射背后的过程具有高水平的周期性和稳定性。这使得无线电发射的变化不太可能是由于外流与可变风团的相互作用。如果射电辐射是由毫弧秒尺度的喷流产生的，它也应该表现出稳定的周期性行为。因此，很难将我们的观测中没有大尺度喷流（~100 mas）与先前报道的持续相对论性喷流的证据相协调。我们发现一个可能的暗示的时间之间的相关性的X射线和TeV的排放和证据的无线电/TeV的非相关性，这表明存在一个人口的粒子产生的无线电发射和不同的一个产生的X射线和TeV的排放。最后给出了一个包含射电、X射线和TeV波段的准同时能谱。

英文摘要：

We present the results of the first multiwavelength observing campaign on the high-mass X-ray binary LS I +61 303 comprising observations at the TeV regime with the MAGIC telescope, along with X-ray observations with Chandra, and radio interferometric observations with the MERLIN, EVN and VLBA arrays, in October and November 2006. From our MERLIN observations, we can exclude the existence of large scale (~100 mas) persistent radio-jets. Our 5.0 GHz VLBA observations display morphological similarities to previous 8.4 GHz VLBA observations carried out at the same orbital phase, suggesting a high level of periodicity and stability of the processes behind the radio emission. This makes it unlikely that variability of the radio emission is due to the interaction of an outflow with variable wind clumps. If the radio emission is produced by a milliarcsecond scale jet, it should also show a stable, periodic behavior. It is then difficult to reconcile the absence of a large scale jet (~100 mas) in our observations with the evidence of a persistent relativistic jet reported previously. We find a possible hint of temporal correlation between the X-ray and TeV emissions and evidence for radio/TeV non-correlation, which points to the existence of one population of particles producing the radio emission and a different one producing the X-ray and TeV emissions. Finally, we present a quasi-simultaneous energy spectrum including radio, X-ray and TeV bands.

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