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H2O MegaMaser emission in NGC 4258 indicative of a periodic disc instability

文献类型：期刊论文

作者Baan, Willem A.6,7,8; An, Tao6; Henkel, Christian4,5,8; Imai, Hiroshi3; Kostenko, Vladimir2; Sobolev, Andrej1
刊名NATURE ASTRONOMY
出版日期2022-06-30
页码8
ISSN号2397-3366
DOI10.1038/s41550-022-01706-y
通讯作者Baan, Willem A.(baan@astron.nl)
英文摘要H2O MegaMaser emission may arise from thin gas discs surrounding the massive nuclei of galaxies such as NGC 4258, but the physical conditions responsible for the amplified emission are unclear. A detailed view of these regions is possible using the very high angular resolution afforded by space very long baseline interferometry (SVLBI). Here we report SVLBI experiments conducted using the orbiting RadioAstron Observatory that have resulted in detections of the H2O 22 GHz emission in NGC 4258, with Earth-space baselines of 1.3, 9.5 and 19.5 Earth diameters. Observations at the highest angular resolutions of 11 and 23 mu as show distinct and regularly spaced regions within the rotating disc, at an orbital radius of about 0.126 pc. These observations at three subsequent epochs also indicate a time evolution of the emission features, with a sudden rise in amplitude followed by a slow decay. The formation of these emission regions, their regular spacing and their time-dependent behaviour appear consistent with the occurrence of a periodic magneto-rotational instability in the disc. This type of shear-driven instability within the differentially rotating disc has been suggested to be the mechanism governing the radial momentum transfer and viscosity within a mass-accreting disc. The connection of the H2O MegaMaser activity with the magneto-rotational instability activity would make it an indicator of the mass-accretion rate in the nuclear disc of the host galaxy. Harnessing the resolving power of space very long baseline interferometry results in a link between 22 GHz H2O MegaMaser emission and accretion activity in the thin disc around the nucleus of galaxy NGC 4258. The emission regions appear consistent with a periodic magneto-rotational instability in the disc.
WOS关键词WEAKLY MAGNETIZED DISKS ; LOCAL SHEAR INSTABILITY ; ACTIVE GALAXY NGC-4258 ; MASS ACCRETION RATE ; GEOMETRIC DISTANCE ; X-RAY ; RADIATION ; STABILITY ; TURBULENT ; SPECTRA
资助项目State Space Corporation ROSCOSMOS ; National Natural Science Foundation of China[11433008] ; Chinese Academy of Sciences President's International Fellowship Initiative[2019VMA0040] ; Chinese Academy of Sciences President's International Fellowship Initiative[2021VMA0008] ; Chinese Academy of Sciences President's International Fellowship Initiative[2022VMA0019] ; Youth Innovation Promotion Association of CAS ; Ministry of Education and Science of Russia[FEUZ-2020-0030] ; Ministry of Education and Science of Russia[K 1567] ; H2O MegaMaser Team
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000819337100002
出版者NATURE PORTFOLIO
资助机构State Space Corporation ROSCOSMOS ; National Natural Science Foundation of China ; Chinese Academy of Sciences President's International Fellowship Initiative ; Youth Innovation Promotion Association of CAS ; Ministry of Education and Science of Russia ; H2O MegaMaser Team
源URL[http://ir.xao.ac.cn/handle/45760611-7/4829]  
专题恒星形成与演化研究团组
通讯作者Baan, Willem A.
作者单位1.Ural Fed Univ, Astron Observ, Ekaterinburg, Russia
2.Lebedev Inst, AstroSpace Ctr, Moscow, Russia
3.Kagoshima Univ, Amanogawa Galaxy Astron Res Ctr, Grad Sch Sci & Engn, Kagoshima, Japan
4.King Abdulaziz Univ, Astron Deptartment, Jeddah, Saudi Arabia
5.Max Planck Inst Radioastron, Bonn, Germany
6.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China
7.Netherlands Inst Radio Astron ASTRON, Dwingeloo, Netherlands
8.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi, Peoples R China
推荐引用方式
GB/T 7714		 Baan, Willem A.,An, Tao,Henkel, Christian,et al. H2O MegaMaser emission in NGC 4258 indicative of a periodic disc instability[J]. NATURE ASTRONOMY,2022:8.
APA Baan, Willem A.,An, Tao,Henkel, Christian,Imai, Hiroshi,Kostenko, Vladimir,&Sobolev, Andrej.(2022).H2O MegaMaser emission in NGC 4258 indicative of a periodic disc instability.NATURE ASTRONOMY,8.
MLA Baan, Willem A.,et al."H2O MegaMaser emission in NGC 4258 indicative of a periodic disc instability".NATURE ASTRONOMY (2022):8.

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