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arXiv 2012.10195astro-ph.HE
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潮汐扰动事件AT 2019 dsg中的吸积盘冷却和窄吸收线

Accretion disc cooling and narrow absorption lines in the tidal disruption event AT 2019dsg

G. Cannizzaro, T. Wevers, P. G. Jonker, M. A. Pérez-Torres, J. Moldon, D. Mata-Sánchez, G. Leloudas, D. R. Pasham, S. Mattila, I. Arcavi, K. Decker French, F. O… 展开作者

G. Cannizzaro, T. Wevers, P. G. Jonker, M. A. Pérez-Torres, J. Moldon, D. Mata-Sánchez, G. Leloudas, D. R. Pasham, S. Mattila, I. Arcavi, K. Decker French, F. Onori, C. Inserra, M. Nicholl, M. Gromadzki, T. -W. Chen, T. E. Müller-Bravo, P. Short, J. P. Anderson, D. R. Young, K. C. Gendreau, Z. Arzoumanian, M. Löwenstein, R. Remillard, R. Roy, D. Hiramatsu

摘要:

我们提出了一个大的多波长后续活动的潮汐中断事件(TDE)的结果\dsg,重点是低到高分辨率的光谱,X射线和无线电观测。该星系拥有一个质量为$\rm (5.4\pm3.2)\times10^6\,M_\odot$的超大质量黑洞,仔细分析没有发现存在活动星系核的证据,相反,TDE宿主星系显示出狭窄的光学发射线,可能是恒星形成活动引起的。瞬变是发光的X射线,无线电,紫外线和光学。X射线发射在$\sim$ 125天后变得无法检测到,射电光度密度在$\sim$ 180天后开始在5.4 GHz以上的频率衰减。TDE的光发射谱线特征在发现瞬变后的$\sim$ 250天内存在。中高分辨率的光谱显示的痕迹的吸收线,我们建议起源于自引力碎片流。在后期,在$\sim$ 200天后,光谱中出现窄的Fe线。TDE以前被归类为N-强,但经过仔细减去宿主星系的恒星贡献,我们没有发现这些N线的TDE光谱的证据,即使O鲍文线检测。所观察到的X射线发射的性质是完全一致的冷却吸积盘的内部区域的检测。光学和无线电性质与在低倾角处看到的该中心引擎一致(即,从两极看)。

英文摘要:

We present the results of a large multi-wavelength follow-up campaign of the Tidal Disruption Event (TDE) \dsg, focusing on low to high resolution optical spectroscopy, X-ray, and radio observations. The galaxy hosts a super massive black hole of mass $\rm (5.4\pm3.2)\times10^6\,M_\odot$ and careful analysis finds no evidence for the presence of an Active Galactic Nucleus, instead the TDE host galaxy shows narrow optical emission lines that likely arise from star formation activity. The transient is luminous in the X-rays, radio, UV and optical. The X-ray emission becomes undetected after $\sim$125 days, and the radio luminosity density starts to decay at frequencies above 5.4 GHz by $\sim$180 days. Optical emission line signatures of the TDE are present up to $\sim$250 days after the discovery of the transient. The medium to high resolution spectra show traces of absorption lines that we propose originate in the self-gravitating debris streams. At late times, after $\sim$200 days, narrow Fe lines appear in the spectra. The TDE was previously classified as N-strong, but after careful subtraction of the host galaxy's stellar contribution, we find no evidence for these N lines in the TDE spectrum, even though O Bowen lines are detected. The observed properties of the X-ray emission are fully consistent with the detection of the inner regions of a cooling accretion disc. The optical and radio properties are consistent with this central engine seen at a low inclination (i.e., seen from the poles).

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