Accretion of clumpy cold gas onto massive black hole binaries: a possible fast route to binary coalescence

doi:10.1093/mnras/sty1709

	Accretion of clumpy cold gas onto massive black hole binaries: a possible fast route to binary coalescence
	Goicovic, Felipe G.1,2; Maureira-Fredes, Cristian 3; Sesana, Alberto 4,5; Amaro-Seoane, Pau 6,7,8,9,10; Cuadra, Jorge 2,11
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018-09-01
卷号	479 期号:3 页码:3438-3455
关键词	accretion, accretion discs black hole physics hydrodynamics galaxies: evolution galaxies: nuclei
ISSN号	0035-8711
DOI	10.1093/mnras/sty1709
英文摘要	In currently favoured hierarchical cosmologies, the formation of massive black hole binaries (MBHBs) following galaxy mergers is unavoidable. Still, due the complex physics governing the (hydro) dynamics of the post-merger dense environment of stars and gas in galactic nuclei, the final fate of those MBHBs is still unclear. In gas-rich environments, it is plausible that turbulence and gravitational instabilities feed gas to the nucleus in the form of a series of cold incoherent clumps, thus providing a way to exchange energy and angular momentum between the MBHB and its surroundings. Within this context, we present a suite of smoothed-particle-hydrodynamical models to study the evolution of a sequence of near-radial turbulent gas clouds as they infall towards equal-mass, circular MBHBs. We focus on the dynamical response of the binary orbit to different levels of anisotropy of the incoherent accretion events. Compared to a model extrapolated from a set of individual cloud-MBHB interactions, we find that accretion increases considerably and the binary evolution is faster. This occurs because the continuous infall of clouds drags inwards circumbinary gas left behind by previous accretion events, thus promoting a more effective exchange of angular momentum between the MBHB and the gas. These results suggest that sub-parsec MBHBs efficiently evolve towards coalescence during the interaction with a sequence of individual gas pockets.
资助项目	CONICYT-Chile through the PCHA Doctorado Nacional scholarship ; Deutscher Akademischer Austauschdienst DAAD (German Academic Exchange service) in the context of the PUC-HD Graduate Exchange Fellowship ; European Research Council under ERC-StG grant[EXAGAL-308037] ; Klaus Tschira Foundation ; Deutsche Forschungsgemeinschaft DFG (German Research Foundation)[Transregio 7] ; DFG ; International Max-Planck Research School ; Ramon y Cajal Programme of the Ministry of Economy, Industry and Competitiveness of Spain ; COST Action GWverse[CA16104] ; CAS President's International Fellowship Initiative ; CONICYT-Chile through FONDECYT grant[1141175] ; CONICYT-Chile through Basal grant[PFB0609] ; Max Planck Society through a 'Partner Group' grant
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000441382300044
内容类型	期刊论文
源URL	[http://ir.amss.ac.cn/handle/2S8OKBNM/31095]
专题	中国科学院数学与系统科学研究院
通讯作者	Goicovic, Felipe G.; Maureira-Fredes, Cristian
作者单位	1.HITS, Schloss Wolfsbrunnenweg 35, D-69118 Heidelberg, Germany 2.Pontificia Univ Catolica Chile, Inst Astrofis, Ave Vicuna Mackenna 4860, Santiago 7820436, Chile 3.AEI, Max Planck Inst Gravitat Phys, Mulenberg 1, Potsdam, Germany 4.Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England 5.Univ Birmingham, Inst Gravitat Wave Astron, Birmingham B15 2TT, W Midlands, England 6.CSIC, Inst Space Sci ICE, Campus UAB,Carrer Can Magrans S-N, E-08193 Barcelona, Spain 7.IEEC, Campus UAB,Carrer Can Magrans S-N, E-08193 Barcelona, Spain 8.Chinese Acad Sci, Acad Math & Syst Sci, Inst Appl Math, Beijing 100190, Peoples R China 9.Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 10.TU Berlin, Zentrum Astron & Astrophys, Hardenbergstr 36, D-10623 Berlin, Germany
推荐引用方式 GB/T 7714	Goicovic, Felipe G.,Maureira-Fredes, Cristian,Sesana, Alberto,et al. Accretion of clumpy cold gas onto massive black hole binaries: a possible fast route to binary coalescence[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,479(3):3438-3455.
APA	Goicovic, Felipe G.,Maureira-Fredes, Cristian,Sesana, Alberto,Amaro-Seoane, Pau,&Cuadra, Jorge.(2018).Accretion of clumpy cold gas onto massive black hole binaries: a possible fast route to binary coalescence.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,479(3),3438-3455.
MLA	Goicovic, Felipe G.,et al."Accretion of clumpy cold gas onto massive black hole binaries: a possible fast route to binary coalescence".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 479.3(2018):3438-3455.