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arXiv 2301.04280astro-ph.HE
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超大质量黑洞双星中双喷流相互作用产生的非热辐射

Non-thermal radiation from dual jet interactions in supermassive black hole binaries

E. M. Gutiérrez, L. Combi, G. E. Romero, M. Campanelli

AI总结:

本研究针对区分单个活动星系核与超大质量黑洞双星的观测需求,提出密近黑洞双星的双喷流相互作用触发磁重联产生非热辐射的新型电磁特征,建模得到能谱与光变时标并对比普通活动星系核辐射。

摘要:

超大质量黑洞双星(SMBHBs)是星系并合的自然产物,被认为是强大的多信使源。它们可由物质吸积提供能量,进而在整个电磁波谱上辐射,与普通活动星系核(AGNs)十分相似。当前的电磁观测台站很有希望在不久的将来探测并识别这类系统,但需要精确的观测指标来区分单个AGN与SMBHB。\n本文提出了一种来自SMBHB的新型电磁特征:由黑洞喷流之间的相互作用产生的非热辐射。我们研究密近SMBHB系统,这类系统从环绕双星的盘以及每个黑洞周围形成的迷你盘中吸积物质。每个黑洞通过Blandford–Znajeck机制沿其自旋方向喷出磁主导喷流。我们认为在这种情况下,喷流间的相互作用会触发强磁重联事件,粒子在此过程中被加速并辐射出非热辐射。根据喷流是对齐还是错位,这种辐射会呈现不同的周期性。我们对双喷流相互作用过程中被加速粒子的演化进行建模,计算其辐射输出,得到了能谱并给出了光变时标的估计值。最后我们讨论了这种辐射与普通AGN辐射的对比情况。

英文摘要:

Supermassive black hole binaries (SMBHBs) are natural by-products of galaxy mergers and are expected to be powerful multi-messenger sources. They can be powered by the accretion of matter and then radiate across the electromagnetic spectrum, much like normal active galactic nuclei (AGNs). Current electromagnetic observatories have a good chance of detecting and identifying these systems in the near future. However, precise observational indicators are needed to distinguish individual AGNs from SMBHBs. In this paper, we propose a novel electromagnetic signature from SMBHBs: non-thermal emission produced by the interaction between the jets ejected by the black holes. We study close SMBHBs, which accrete matter from a circumbinary disc and the mini-discs formed around each hole. Each black hole ejects a magnetically dominated jet in the direction of its spin through the Blandford--Znajeck mechanism. We argue that in such a situation, the interaction between the jets can trigger strong magnetic reconnection events, where particles are accelerated and emit non-thermal radiation. Depending on whether the jets are aligned or misaligned, this radiation can have different periodicities. We model the evolution of the particles accelerated during the dual jet interaction and calculate their radiative output, obtaining spectra and providing estimates for the variability timescales. We finally discuss how this emission compares with that of normal AGNs.

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