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arXiv 1702.00792astro-ph.HEastro-ph.GA
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一个可能长达十年的持续潮汐扰动事件

A likely decade-long sustained tidal disruption event

Dacheng Lin, James Guillochon, S. Komossa, Enrico Ramirez-Ruiz, Jimmy A. Irwin, W. Peter Maksym, Dirk Grupe, Olivier Godet, Natalie A. Webb, Didier Barret, B. A… 展开作者

Dacheng Lin, James Guillochon, S. Komossa, Enrico Ramirez-Ruiz, Jimmy A. Irwin, W. Peter Maksym, Dirk Grupe, Olivier Godet, Natalie A. Webb, Didier Barret, B. Ashley Zauderer, Pierre-Alain Duc, Eleazar R. Carrasco, Stephen D. J. Gwyn

摘要:

潮汐破裂和恒星吸积产生的多波长耀斑可以用来发现和研究星系核中休眠的大质量黑洞。以前监测良好的候选耀斑是短暂的,大多数排放限制在1年内。在这里,我们报告了一个观测良好的超长(>11年)发光软X射线耀斑从矮星暴星系的核区域的发现。在十年前的大约4个月内明显快速上升之后,X射线光度虽然显示出微弱的衰减趋势,但一直保持在爱丁顿极限附近(当辐射压力平衡引力时)。X射线光谱通常是柔和的(向更高能量急剧下降),可以用来自光学厚的低温日冕的康普顿辐射来描述,这是一种在吸积恒星质量的黑洞中经常观察到的超爱丁顿吸积特征。最近的一次观测也发现了戏剧性的光谱软化,这意味着从超爱丁顿吸积态到标准热态的暂时过渡,或者存在一个短暂的高蓝移(~ 0.36 c)的温暖吸收体。所有这些性质一致表明,以前从未观察到的异常长的超爱丁顿吸积阶段的潮汐破坏事件。

英文摘要:

Multiwavelength flares from tidal disruption and accretion of stars can be used to find and study otherwise dormant massive black holes in galactic nuclei. Previous well-monitored candidate flares are short-lived, with most emission confined to within ~1 year. Here we report the discovery of a well observed super-long (>11 years) luminous soft X-ray flare from the nuclear region of a dwarf starburst galaxy. After an apparently fast rise within ~4 months a decade ago, the X-ray luminosity, though showing a weak trend of decay, has been persistently high at around the Eddington limit (when the radiation pressure balances the gravitational force). The X-ray spectra are generally soft (steeply declining towards higher energies) and can be described with Comptonized emission from an optically thick low-temperature corona, a super-Eddington accretion signature often observed in accreting stellar-mass black holes. Dramatic spectral softening was also caught in one recent observation, implying either a temporary transition from the super-Eddington accretion state to the standard thermal state or the presence of a transient highly blueshifted (~0.36c) warm absorber. All these properties in concert suggest a tidal disruption event of an unusually long super-Eddington accretion phase that has never been observed before.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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