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arXiv 1801.03094astro-ph.HE
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ASASSN-14 li潮汐扰动事件的长期射电和X射线演化

Long-term radio and X-ray evolution of the tidal disruption event ASASSN-14li

J. S. Bright, R. P. Fender, S. E. Motta, K. Mooley, Y. C. Perrott, S. van Velzen, S. Carey, J. Hickish, N. Razavi-Ghods, D. Titterington, P. Scott, K. Grainge, … 展开作者

J. S. Bright, R. P. Fender, S. E. Motta, K. Mooley, Y. C. Perrott, S. van Velzen, S. Carey, J. Hickish, N. Razavi-Ghods, D. Titterington, P. Scott, K. Grainge, A. Scaife, T. Cantwell, C. Rumsey

摘要:

我们报告的晚时间无线电和X射线观测的潮汐中断事件候选者ASASSN-14里,涵盖了前1000天的衰变阶段。在$\sim200$的第一天,无线电和X射线的发射是一致的。这个阶段是更好的拟合指数衰减在X射线波长,而无线电发射是很好地描述了指数或规范$t^{-5/3}$衰减假设的潮汐破坏事件。这一时期的射电和X射线辐射之间的相关关系可用$L_{R}\propto L_{X}^{1.9\pm0.2}$拟合。400天后,$15.5\,\textrm{GHz}$的无线电发射已经达到$244\pm8\,μ\textrm{Jy}$的平台水平,并至少在接下来的600天内保持该水平,而X射线发射继续呈指数衰减。这种稳定的无线电辐射水平可能是由于历史无线电观测所暗示的弱活动星系核活动的遗留无线电波瓣。我们注意到,虽然大多数现有的模型是基于从中央黑洞解耦的喷出物的演变,无线电:X射线相关性在下降阶段也是一致的核心喷流发射耦合到一个辐射效率的吸积流。

英文摘要:

We report on late time radio and X-ray observations of the tidal disruption event candidate ASASSN-14li, covering the first 1000 days of the decay phase. For the first $\sim200$ days the radio and X-ray emission fade in concert. This phase is better fit by an exponential decay at X-ray wavelengths, while the radio emission is well described by either an exponential or the canonical $t^{-5/3}$ decay assumed for tidal disruption events. The correlation between radio and X-ray emission during this period can be fit as $L_{R}\propto L_{X}^{1.9\pm0.2}$. After 400 days the radio emission at $15.5\,\textrm{GHz}$ has reached a plateau level of $244\pm8\,μ\textrm{Jy}$ which it maintains for at least the next 600 days, while the X-ray emission continues to fade exponentially. This steady level of radio emission is likely due to relic radio lobes from the weak AGN-like activity implied by historical radio observations. We note that while most existing models are based upon the evolution of ejecta which are decoupled from the central black hole, the radio : X-ray correlation during the declining phase is also consistent with core jet emission coupled to a radiatively efficient accretion flow.

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