Millihertz Oscillations Near the Innermost Orbit of a Supermassive Black Hole
Megan Masterson, Erin Kara, Christos Panagiotou, William N. Alston, Joheen Chakraborty, Kevin Burdge, Claudio Ricci, Sibasish Laha, Iair Arcavi, Riccardo Arcodi… 展开作者
Megan Masterson, Erin Kara, Christos Panagiotou, William N. Alston, Joheen Chakraborty, Kevin Burdge, Claudio Ricci, Sibasish Laha, Iair Arcavi, Riccardo Arcodia, S. Bradley Cenko, Andrew C. Fabian, Javier A. García, Margherita Giustini, Adam Ingram, Peter Kosec, Michael Loewenstein, Eileen T. Meyer, Giovanni Miniutti, Ciro Pinto, Ronald A. Remillard, Dev R. Sadaula, Onic I. Shuvo, Benny Trakhtenbrot, Jingyi Wang
Recent discoveries from time-domain surveys are defying our expectations for how matter accretes onto supermassive black holes (SMBHs). The increased rate of short-timescale, repetitive events around SMBHs, including the newly-discovered quasi-periodic eruptions (QPEs), are garnering further interest in stellar-mass companions around SMBHs and the progenitors to mHz frequency gravitational wave events. Here we report the discovery of a highly significant mHz Quasi-Periodic Oscillation (QPO) in an actively accreting SMBH, 1ES 1927+654, which underwent a major optical, UV, and X-ray outburst beginning in 2018. The QPO was first detected in 2022 with a roughly 18-minute period, corresponding to coherent motion on scales of less than 10 gravitational radii, much closer to the SMBH than typical QPEs. The period decreased to 7.1 minutes over two years with a decelerating period evolution ($\ddot{P} > 0$). This evolution has never been seen in SMBH QPOs or high-frequency QPOs in stellar mass black holes. Models invoking orbital decay of a stellar-mass companion struggle to explain the period evolution without stable mass transfer to offset angular momentum losses, while the lack of a direct analog to stellar mass black hole QPOs means that many instability models cannot explain all of the observed properties of the QPO in 1ES 1927+654. Future X-ray monitoring will test these models, and if it is a stellar-mass orbiter, the Laser Interferometer Space Antenna (LISA) should detect its low-frequency gravitational wave emission.
Nonthermal hotspot orbiting the supermassive black hole Sgr A*
Instituto de Astronomía, Universidad Nacional Autónoma de México(墨西哥国立自治大学天文研究所);Instituto Nacional de Astrofísica, Óptica y Electrónica(墨西哥国家天文学、光学和电子学研究所);Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交通大学李政道研究所);School of Physics and Astronomy, Shanghai Jiao Tong University(上海交通大学物理与天文学院)
Supermassive black-hole imaging with a self-consistent electron-temperature prescription
Instituto de Astronomía, Universidad Nacional Autónoma de México(墨西哥国立自治大学天文学研究所);Institut für Theoretische Physik, Goethe Universität(歌德大学理论物理研究所);Institut für Theoretische Physik und Astrophysik, Universität Würzburg(维尔茨堡大学理论物理与天体物理研究所);Max-Planck-Institut für Radioastronomie(马克斯·普朗克射电天文研究所);Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University(上海交通大学李政道理论与粒子物理研究所及物理与天文学院);Dipartimento di Fisica, Università della Calabria(卡塔尼亚大学物理系);Research Center for Astronomy and Applied Mathematics, Academy of Athens(雅典科学院天文学与应用数学研究中心);Mullard Space Science Laboratory, University College London(伦敦大学学院穆拉德空间科学实验室);CERN, Theoretical Physics Department(欧洲核子研究中心理论物理部);School of Mathematics, Trinity College, Dublin(都柏林三一学院数学学院)
Transient Relativistic Iron Emission Line from an X-ray Flaring Supermassive Black Hole
California Institute of Technology(加州理工学院);University of Illinois at Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);Clemson University(克莱姆森大学);NASA Goddard Space Flight Center(美国宇航局戈达德太空飞行中心);Università di Bologna(博洛尼亚大学);INAF, Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(意大利国家天体物理研究所博洛尼亚天文与空间科学观测站);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室)
Direct probe of the inner accretion flow around the supermassive black hole in NGC 2617
NGC 2617是一个邻近的($z\sim 0.01$)活跃星系,最近从塞弗特1.8转变为塞弗特1.0。与此同时,相对于档案测量,它的X射线通量大幅增加了一个数量级。为了研究外观变化的活动星系核(AGN)的物理性质,我们测量了NGC 2617的X射线光谱和时间特性。我们对间隔一个月的两个XMM-牛顿定点观测进行了全面的时间和谱分析,并辅以存档的准同步积分观测。我们发现,一阶,NGC 2617看起来像一个1型活动星系核的X射线波段,并增加了一个适度的反射组件,其连续可以建模以及与幂律加上一个唯象黑体,一个部分覆盖的幂律,或双康普顿模型。与所采用的连续体无关,在所有三种情况下,数据要求覆盖连续体源的20- 40%的中性气体的几个$10^{23}$ cm $^{-2}$的柱密度。最有趣的是,吸收结构,由于高度电离铁已被检测到在这两个观测与红移约$0.1c$相对于系统的主机星系的红移。红移的吸收体可以归因于失败的风/中止喷流组件,引力红移效应,和/或直接向中央超大质量黑洞下降的物质。无论哪种情况,我们都在探测NGC 2617中心超大质量黑洞周围最里面的吸积流,甚至可能观察到物质直接流入黑洞本身。
Directly tracking the re-brightening of a supermassive black hole accretion disk
INAF Osservatorio Astronomico di Roma(意大利国家天体物理研究所罗马天文台);INAF – Osservatorio Astrofisico di Arcetri(意大利国家天体物理研究所阿切特里天文台);Centre for Extragalactic Astronomy, Department of Physics, University of Durham(杜伦大学物理系河外星系研究中心);Dipartimento di Fisica e Astronomia, Università di Firenze(佛罗伦萨大学物理与天文系);Dipartimento di Fisica, Università degli Studi di Roma “Tor Vergata”(罗马第二大学物理系);Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre(罗马第三大学数学与物理系);Quasar Science Resources SL for ESA, (ESAC), Science Operations Department(欧洲空间局科学操作部门夸克科学资源有限公司);NASA(美国国家航空航天局)
The condensation of the corona for the correlation between the hard X-ray photon index $Γ$ and the reflection scaling factor $\Re$ in active galactic nuclei
Constructing a gravitational wave analysis pipeline for extremely large mass ratio inspirals
Sun Yat-sen University (Zhuhai Campus)(中山大学(珠海校区));Huazhong University of Science and Technology(华中科技大学);Beijing Institute of Mathematical Sciences and Applications(北京国际数学研究中心);Peking University(北京大学);Hebei University(河北大学)
Stellar Collisions from Self-consistent Stellar Dynamics Around Growing Supermassive black Holes
Guangzhou University(广州大学);Key Laboratory for Astronomical Observation and Technology of Guangzhou(广州市天文观测与技术重点实验室);Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province(广东省教育厅天文学科学与技术研究实验室);Universitat Politècnica de València(瓦伦西亚理工大学);Max-Planck-Institute for Extraterrestrial Physics(马克斯·普朗克地外物理研究所);Kavli Institute for Astronomy and Astrophysics(卡弗里天体物理学研究所)
Masaryk University(马萨里克大学);Center for Theoretical Physics, Polish Academy of Sciences(波兰科学院理论物理中心);International Center for Theoretical Sciences, Tata Institute of Fundamental Research(塔塔基础研究所国际理论科学中心);Mendel University in Brno(布尔诺门德尔大学);Brno Observatory and Planetarium(布尔诺天文台和天文馆)