X-ray spectral components of the blazar and binary black hole candidate OJ 287 (2005–2020)
X-ray spectral components of the blazar and binary black hole candidate OJ 287 (2005–2020)
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DOI：
10.1093/mnras/stab1223
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发表时间：
2021-05
影响因子：
4.8
通讯作者：
S. Komossa;D. Grupe;M. Parker;J. G'omez;M. Valtonen;M. Nowak;S. Jorstad;D. Haggard;S. Chandra-S.-C
中科院分区：
文献类型：
--
作者：
S. Komossa;D. Grupe;M. Parker;J. G'omez;M. Valtonen;M. Nowak;S. Jorstad;D. Haggard;S. Chandra-S.-C
我们对 OJ 287 的所有 XMM-牛顿光谱进行了全面分析，涵盖了该明亮耀变体 15 年的 X 射线光谱。我们还报告了自 2015 年开始对 OJ 287 进行专用 Swift UVOT 和 XRT 监测的最新结果，以及自 2005 年以来所有早期公开的 Swift 数据。在此时间间隔内，OJ 287 陷入极端极小值和爆发状态。它的 X 射线光谱变化很大，涵盖了耀变体中看到的从非常平坦到异常陡峭的所有状态。光谱可以分解为三个光谱成分：在低态下占主导地位的逆康普顿（IC）发射，随着 OJ 287 变亮而变得越来越占主导地位的超软同步加速器发射，以及在爆发时看到的中软（Гx = 2.2）附加成分。最后一个分量延伸超过 10 keV，似乎代表了第二个同步加速器/IC 分量和/或初级超大质量黑洞 (SMBH) 的临时盘日冕。我们的 2018 年 XMM-牛顿观测与事件视界望远镜对 OJ 287 的观测准同时进行，可以通过双分量模型很好地描述，其中硬 IC 分量为 Γx = 1.5，软同步加速器分量为。低态光谱将 X 射线中任何长寿命吸积盘/日冕的贡献限制为非常低的值 Lx/LEdd < 5.6 × 10−4（对于 MBH，初级 = 1.8 × 1010 M⊙）。讨论了 OJ 287 二进制 SMBH 模型的一些含义。
We present a comprehensive analysis of all XMM–Newton spectra of OJ 287 spanning 15 yr of X-ray spectroscopy of this bright blazar. We also report the latest results from our dedicated Swift UVOT and XRT monitoring of OJ 287, which started in 2015, along with all earlier public Swift data since 2005. During this time interval, OJ 287 was caught in extreme minima and outburst states. Its X-ray spectrum is highly variable and encompasses all states seen in blazars from very flat to exceptionally steep. The spectrum can be decomposed into three spectral components: Inverse Compton (IC) emission dominant at low-state, supersoft synchrotron emission that becomes increasingly dominant as OJ 287 brightens, and an intermediately-soft (Γx = 2.2) additional component seen at outburst. This last component extends beyond 10 keV and plausibly represents either a second synchrotron/IC component and/or a temporary disc corona of the primary supermassive black hole (SMBH). Our 2018 XMM–Newton observation, quasi-simultaneous with the Event Horizon Telescope observation of OJ 287, is well described by a two-component model with a hard IC component of Γx = 1.5 and a soft synchrotron component. Low-state spectra limit any long-lived accretion disc/corona contribution in X-rays to a very low value of Lx/LEdd < 5.6 × 10−4 (for MBH, primary = 1.8 × 1010 M⊙). Some implications for the binary SMBH model of OJ 287 are discussed.