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arXiv 1703.02110astro-ph.HE
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银河系黑洞候选者XTE J1908 +094中已解析的膨胀喷流

Resolved, expanding jets in the Galactic black hole candidate XTE J1908+094

A. P. Rushton, J. C. A. Miller-Jones, P. A. Curran, G. R. Sivakoff, M. P. Rupen, Z. Paragi, R. E. Spencer, J. Yang, D. Altamirano, T. Belloni, R. P. Fender, H. … 展开作者

A. P. Rushton, J. C. A. Miller-Jones, P. A. Curran, G. R. Sivakoff, M. P. Rupen, Z. Paragi, R. E. Spencer, J. Yang, D. Altamirano, T. Belloni, R. P. Fender, H. A. Krimm, D. Maitra, S. Migliari, D. M. Russell, T. D. Russell, R. Soria, V. Tudose

摘要:

黑洞X射线双星经历偶尔爆发所造成的变化内部吸积流。在这里,我们报告了2013年黑洞候选X射线双星系统J1908+094爆发的高角分辨率射电观测,使用来自VLBA和EVN的数据。我们发现,硬到软的状态转换后,我们检测到移动的射流结,出现不对称的形态和亮度,并扩大成为横向解决,因为他们远离核心,沿轴对齐约$-11$ \degree \东北。我们最初只看到南部的分量,其演变引起15 mJy的射电耀斑,并产生观测到的射电偏振。这一现象在4天后逐渐消失,之后第二个分量出现在北方,向相反的方向移动。从相对于X射线状态转变的结的出现的时间,推断的磁场方向的90 \degree \摆动,结的不对称外观,它们的复杂和不断变化的形态,以及它们的低速度,我们解释的结作为工作表面的射流影响周围的介质。这意味着XTE J1908+094周围的环境比微类星体源GRS 1915+105和GRO J1655-40周围的环境要致密得多。

英文摘要:

Black hole X-ray binaries undergo occasional outbursts caused by changing inner accretion flows. Here we report high-angular resolution radio observations of the 2013 outburst of the black hole candidate X-ray binary system J1908+094, using data from the VLBA and EVN. We show that following a hard-to-soft state transition, we detect moving jet knots that appear asymmetric in morphology and brightness, and expand to become laterally resolved as they move away from the core, along an axis aligned approximately $-11$\degree\ east of north. We initially see only the southern component, whose evolution gives rise to a 15-mJy radio flare and generates the observed radio polarization. This fades and becomes resolved out after 4 days, after which a second component appears to the north, moving in the opposite direction. From the timing of the appearance of the knots relative to the X-ray state transition, a 90\degree\ swing of the inferred magnetic field orientation, the asymmetric appearance of the knots, their complex and evolving morphology, and their low speeds, we interpret the knots as working surfaces where the jets impact the surrounding medium. This would imply a substantially denser environment surrounding XTE J1908+094 than has been inferred to exist around the microquasar sources GRS 1915+105 and GRO J1655-40.

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