A Transient “Changing-look” Active Galactic Nucleus Resolved on Month Timescales from First-year Sloan Digital Sky Survey V Data-猫眼课题宝

DOI：

10.3847/2041-8213/ac9a47

发表时间：

2022-10

期刊：

The Astrophysical Journal Letters

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Grisha Zeltyn;B. Trakhtenbrot;M. Eracleous;J. Runnoe;J. Trump;J. Stern;Yue Shen;Lorena Hernández-García;F. Bauer;Qian Yang;T. Dwelly;C. Ricci;P. Green;S. Anderson;R. Assef;M. Guolo;C. MacLeod;M. Davis;Logan B. Fries;S. Gezari;N. Grogin;D. Homan;A. Koekemoer;M. Krumpe;S. LaMassa;Xin Liu;A. Merloni;M. Martínez–Aldama;D. Schneider;M. Temple;J. Brownstein;H. Ibarra-Medel;J. Burke;C. Pellegrino;J. Kollmeier

我们报告发现了一个新的“改变外观”活动星系核（CLAGN）事件，在类星体SDSS J162829.17+432948.5在z = 0.2603，通过重复光谱从第五次斯隆数字巡天（SDSS-V）。在2020-2021年期间进行的光学光度测量显示，Δg/1 mag的急剧变暗，随后在几个月的时间尺度上迅速恢复，新的SDSS-V和Las Cumbres天文台光谱仪捕获了12个月的重新变亮。这是迄今为止观察到的最快的CLAGN转变之一。档案观测表明，该物体在2011-2013年期间经历了更为渐进的变暗。我们的光谱学表明，光度变化伴随着类星体连续谱和宽线发射的剧烈变化。的前和后倾角的光度和光谱外观的源，以及事实上，最暗淡的光谱可以通过应用一个单一的消光定律，以较亮的光谱状态再现之间的良好协议，有利于一个可变的视线模糊的驱动程序所观察到的过渡。这种解释面临着一些理论上的挑战，因此不能排除另一种吸积驱动的情景。最近在这个类星体中观察到的事件突出了在数周到数月的时间尺度上对大型活动星系核样本进行光谱监测的重要性，SDSS-V旨在实现这一目标。

We report the discovery of a new “changing-look” active galactic nucleus (CLAGN) event, in the quasar SDSS J162829.17+432948.5 at z = 0.2603, identified through repeat spectroscopy from the fifth Sloan Digital Sky Survey (SDSS-V). Optical photometry taken during 2020–2021 shows a dramatic dimming of Δg ≈ 1 mag, followed by a rapid recovery on a timescale of several months, with the ≲2 month period of rebrightening captured in new SDSS-V and Las Cumbres Observatory spectroscopy. This is one of the fastest CLAGN transitions observed to date. Archival observations suggest that the object experienced a much more gradual dimming over the period of 2011–2013. Our spectroscopy shows that the photometric changes were accompanied by dramatic variations in the quasar-like continuum and broad-line emission. The excellent agreement between the pre- and postdip photometric and spectroscopic appearances of the source, as well as the fact that the dimmest spectra can be reproduced by applying a single extinction law to the brighter spectral states, favor a variable line-of-sight obscuration as the driver of the observed transitions. Such an interpretation faces several theoretical challenges, and thus an alternative accretion-driven scenario cannot be excluded. The recent events observed in this quasar highlight the importance of spectroscopic monitoring of large active galactic nucleus samples on weeks-to-months timescales, which the SDSS-V is designed to achieve.

A Transient “Changing-look” Active Galactic Nucleus Resolved on Month Timescales from First-year Sloan Digital Sky Survey V Data

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