Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019)最新文献_第2页

Early black-hole seeds in the first billion years 最初十亿年的早期黑洞种子

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2019-08-13 DOI: 10.22323/1.362.0014

U. Maio

{"title":"Early black-hole seeds in the first billion years","authors":"U. Maio","doi":"10.22323/1.362.0014","DOIUrl":"https://doi.org/10.22323/1.362.0014","url":null,"abstract":"Supermassive black holes with billion solar masses are in place already within the first Gyr, however, their origin and growth in such a short lapse of time is extremely challenging to understand. Here, we discuss the formation paths of early black-hole seeds, showing the limits of light black-hole seeds from stellar origin and the expected characteristics of heavy/massive black-hole seeds originated by gas direct collapse in peculiar primordial conditions. To draw conclusions on the possible candidates and the role of the ambient medium, we use results from N-body hydrodynamic simulations including atomic and molecular non-equilibrium abundance calculations, cooling, star formation, feedback mechanisms, stellar evolution, metal spreading of several heavy elements from SNII, AGB and SNIa, and multifrequency radiative transfer over 150 frequencies coupled to chemistry and SED emission for popII-I and popIII stellar sources. Standard stellar-origin light black holes are unlikely to be reliable seeds of early supermassive black holes, because, under realistic assumptions, they cannot grow significantly in less than a billion years. Alternatively, massive black-hole seeds might originate from direct collapse of pristine gas in primordial quiescent mini-haloes that are exposed to stellar radiation from nearby star forming regions. The necessary conditions required to form these heavy seeds must be complemented with information on the complex features of local environments and the fine balance between chemistry evolution and radiative transfer.","PeriodicalId":265862,"journal":{"name":"Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124927972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Astrophysical Black Holes: A Review 天体物理学黑洞:综述

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2019-06-10 DOI: 10.22323/1.362.0028

C. Bambi

引用次数: 19

Multi-frequency long-term observations of Her X-1 - The 35-d cycle 她的X-1的多频长期观测- 35 d周期

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2019-06-01 DOI: 10.22323/1.362.0047

N. Shakura, D. Kolesnikov, K. Postnov, I. Volkov, I. Bikmaev, T. Irsmambetova, R. Staubert, J. Wilms, E. Irtuganov, P. Shurygin, P. Golysheva, S. Shugarov, I. Nikolenko, E. Trunkovsky, G. Schonherr, A. Schwope, D. Klochkov

引用次数: 0

Large-Scale Hydrodynamic Simulations of Astrophysical Jets 天体物理喷流的大规模流体动力学模拟

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2018-12-10 DOI: 10.22323/1.331.0060

J. Beall, K. Lind, P. Meintjes, D. Rose, M. Wolff, Brian vanSoelen, Izak vanderWesthuizen

引用次数: 0

GLADIS: GLobal Accretion Disk Instability Simulation 全球吸积盘不稳定性模拟

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2018-12-01 DOI: 10.22323/1.362.0048

A. Janiuk

引用次数: 2

High Energy Astrophysical Techniques 高能天体物理技术

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2016-12-03 DOI: 10.1007/978-3-319-44729-2

R. Poggiani

引用次数: 3