Effects of Heat Conduction on Blocking off the Super-Eddington Growth of Black Holes at High Redshift
We investigate the effect of conductive heating of the gas surrounding a geometrically thick accretion disk on the growth of a black hole (BH) at high redshift. If a BH is accreting the surrounding gas at a super-Eddington rate, the X-ray radiation from the vicinity of the BH would be highly anisotr...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acee6d |
| _version_ | 1797681420491030528 |
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| author | Norita Kawanaka Kazunori Kohri |
| author_facet | Norita Kawanaka Kazunori Kohri |
| author_sort | Norita Kawanaka |
| collection | DOAJ |
| description | We investigate the effect of conductive heating of the gas surrounding a geometrically thick accretion disk on the growth of a black hole (BH) at high redshift. If a BH is accreting the surrounding gas at a super-Eddington rate, the X-ray radiation from the vicinity of the BH would be highly anisotropic due to the self-shielding of a geometrically thick accretion disk, and then the radiative feedback on the surrounding medium would be suppressed in the equatorial region, within which super-Eddington accretion can continue. However, if this region is sufficiently heated via thermal conduction from the adjacent region that is not shielded and heated by the X-ray irradiation, the surrounding gas becomes isotropically hot, and the Bondi accretion rate would be suppressed and become sub-Eddington. We evaluate the condition under which such isotropic heating is realized and derive new criteria required for super-Eddington accretion. |
| first_indexed | 2024-03-11T23:44:35Z |
| format | Article |
| id | doaj.art-08c66dba95c7409093dd13c4c9338aa6 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-11T23:44:35Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-08c66dba95c7409093dd13c4c9338aa62023-09-19T12:19:09ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195516710.3847/1538-4357/acee6dEffects of Heat Conduction on Blocking off the Super-Eddington Growth of Black Holes at High RedshiftNorita Kawanaka0Kazunori Kohri1Department of Physics, Graduate School of Science, Tokyo Metropolitan University 1-1 , Minami-Osawa, Hachioji-shi, Tokyo 192-0397, Japan; National Astronomical Observatory of Japan (NAOJ) , 2-21-1, Osawa, Mitaka, Tokyo 181-8588, Japan; Center for Gravitational Physics and Quantum Information, Yukawa Institute for Theoretical Physics, Kyoto University , Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, JapanDivision of Science, National Astronomical Observatory of Japan (NAOJ) , and SOKENDAI, 2-21-1, Osawa, Mitaka, Tokyo 181-8588, Japan; Theory Center, Institute of Particle and Nuclear Studies (IPNS) , and QUP(WPI), KEK, Tsukuba 305-0801, Japan; Kavli IPMU (WPI), UTIAS, The University of Tokyo , Kashiwa, Chiba 277-8583, JapanWe investigate the effect of conductive heating of the gas surrounding a geometrically thick accretion disk on the growth of a black hole (BH) at high redshift. If a BH is accreting the surrounding gas at a super-Eddington rate, the X-ray radiation from the vicinity of the BH would be highly anisotropic due to the self-shielding of a geometrically thick accretion disk, and then the radiative feedback on the surrounding medium would be suppressed in the equatorial region, within which super-Eddington accretion can continue. However, if this region is sufficiently heated via thermal conduction from the adjacent region that is not shielded and heated by the X-ray irradiation, the surrounding gas becomes isotropically hot, and the Bondi accretion rate would be suppressed and become sub-Eddington. We evaluate the condition under which such isotropic heating is realized and derive new criteria required for super-Eddington accretion.https://doi.org/10.3847/1538-4357/acee6dSupermassive black holesQuasarsBondi accretionAccretion |
| spellingShingle | Norita Kawanaka Kazunori Kohri Effects of Heat Conduction on Blocking off the Super-Eddington Growth of Black Holes at High Redshift The Astrophysical Journal Supermassive black holes Quasars Bondi accretion Accretion |
| title | Effects of Heat Conduction on Blocking off the Super-Eddington Growth of Black Holes at High Redshift |
| title_full | Effects of Heat Conduction on Blocking off the Super-Eddington Growth of Black Holes at High Redshift |
| title_fullStr | Effects of Heat Conduction on Blocking off the Super-Eddington Growth of Black Holes at High Redshift |
| title_full_unstemmed | Effects of Heat Conduction on Blocking off the Super-Eddington Growth of Black Holes at High Redshift |
| title_short | Effects of Heat Conduction on Blocking off the Super-Eddington Growth of Black Holes at High Redshift |
| title_sort | effects of heat conduction on blocking off the super eddington growth of black holes at high redshift |
| topic | Supermassive black holes Quasars Bondi accretion Accretion |
| url | https://doi.org/10.3847/1538-4357/acee6d |
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