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arXiv 1502.00039astro-ph.HE
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X射线双星Swift J1745 $-$ 26的亚毫米喷注性质

Sub-mm Jet Properties of the X-Ray Binary Swift J1745$-$26

A. J. Tetarenko, G. R. Sivakoff, J. C. A. Miller-Jones, P. A. Curran, T. D. Russell, I. M. Coulson, S. Heinz, D. Maitra, S. B. Markoff, S. Migliari, G. R. Petit… 展开作者

A. J. Tetarenko, G. R. Sivakoff, J. C. A. Miller-Jones, P. A. Curran, T. D. Russell, I. M. Coulson, S. Heinz, D. Maitra, S. B. Markoff, S. Migliari, G. R. Petitpas, M. P. Rupen, A. P. Rushton, D. M. Russell, C. L. Sarazin

摘要:

我们提出了我们的观测结果的早期阶段的瞬态黑洞X射线二进制(BHXRB),斯威夫特J1745 $-$ 26,与VLA,SMA和JCMT(SCUBA--2)的爆发。我们的数据标志着第一个多波段毫米和亚毫米观测的BHXRB。在我们的观测过程中,系统处于硬吸积状态,产生稳定的紧凑喷流。无线电和毫米/亚毫米数据的独特组合使我们能够直接测量无线电和毫米/亚毫米范围内和之间的光谱指数,包括为BHXRB测量的第一个毫米/亚毫米光谱指数。频谱拟合显示,毫米(230 GHz)和亚毫米(350 GHz)的测量是一致的,从同期的无线电数据(1- 30 GHz)的逆幂律外推。这表明,正如标准喷流模型预测的那样,扩展到毫米/亚毫米频率的幂律可以充分描述光谱,并表明驱动光谱反演的机制可能是在爆发BHXRB中观察到的高毫米/亚毫米通量(与无线电通量相比)的原因。虽然这个幂律也与同期的光学数据是一致的,光学数据可能来自喷流发射与喷流光谱中断频率的$ν_{\rm break}\gtrsim1\times10^{14}\,{\rm Hz}$或喷流发射与喷流光谱中断频率较低的$ν_{\rm break}\gtrsim2\times10^{11}\,{\rm Hz}$和吸积盘发射的组合。我们的分析巩固了毫米/亚毫米政权的重要性,在弥合无线电和红外频率之间的关键差距,在喷气频谱,并证明需要进一步探讨这一制度。

英文摘要:

We present the results of our observations of the early stages of the 2012--2013 outburst of the transient black hole X-ray binary (BHXRB), Swift J1745$-$26, with the VLA, SMA, and JCMT (SCUBA--2). Our data mark the first multiple-band mm & sub-mm observations of a BHXRB. During our observations the system was in the hard accretion state producing a steady, compact jet. The unique combination of radio and mm/sub-mm data allows us to directly measure the spectral indices in and between the radio and mm/sub-mm regimes, including the first mm/sub-mm spectral index measured for a BHXRB. Spectral fitting revealed that both the mm (230 GHz) and sub-mm (350 GHz) measurements are consistent with extrapolations of an inverted power-law from contemporaneous radio data (1--30 GHz). This indicates that, as standard jet models predict, a power-law extending up to mm/sub-mm frequencies can adequately describe the spectrum, and suggests that the mechanism driving spectral inversion could be responsible for the high mm/sub-mm fluxes (compared to radio fluxes) observed in outbursting BHXRBs. While this power-law is also consistent with contemporaneous optical data, the optical data could arise from either jet emission with a jet spectral break frequency of $ν_{\rm break}\gtrsim1\times10^{14}\,{\rm Hz}$ or the combination of jet emission with a lower jet spectral break frequency of $ν_{\rm break}\gtrsim2\times10^{11}\,{\rm Hz}$ and accretion disc emission. Our analysis solidifies the importance of the mm/sub-mm regime in bridging the crucial gap between radio and IR frequencies in the jet spectrum, and justifies the need to explore this regime further.

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