dc.contributor.author | Sadowski, Aleksander | |
dc.contributor.author | Narayan, Ramesh | |
dc.date.accessioned | 2016-08-02T19:51:43Z | |
dc.date.issued | 2015 | |
dc.identifier.citation | Sadowski, Aleksander, and Ramesh Narayan. 2015. “Photon-Conserving Comptonization in Simulations of Accretion Discs Around Black Holes.” Monthly Notices of the Royal Astronomical Society 454 (3) (October 13): 2372–2380. doi:10.1093/mnras/stv2022. | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://nrs.harvard.edu/urn-3:HUL.InstRepos:27772997 | |
dc.description.abstract | We introduce a new method for treating Comptonization in computational fluid dynamics. By construction, this method conserves the number of photons. Whereas the traditional “blackbody Comptonization” approach assumes that the radiation is locally a perfect blackbody and therefore uses a single parameter, the radiation temperature, to describe the radiation, the new “photon-conserving Comptonization” approach treats the photon gas as a Bose-Einstein fluid and keeps track of both the radiation temperature and the photon number density. We have implemented photon-conserving Comptonization in the general relativistic radiation magnetohydrodynamical code KORAL and we describe its impact on simulations of mildly super-critical black hole accretion disks. We find that blackbody Comptonization underestimates the gas and radiation temperature by up to a factor of two compared to photonconserving Comptonization. This discrepancy could be serious when computing spectra. The photon-conserving simulation indicates that the spectral color correction factor of the escaping radiation in the funnel region of the disk could be as large as 5. | en_US |
dc.description.sponsorship | Astronomy | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | Oxford University Press (OUP) | en_US |
dc.relation.isversionof | doi:10.1093/mnras/stv2022 | en_US |
dc.relation.hasversion | http://arxiv.org/abs/1508.04980 | en_US |
dash.license | OAP | |
dc.subject | accretion | en_US |
dc.subject | accretion discs | en_US |
dc.subject | black hole physics | en_US |
dc.subject | relativistic processes | en_US |
dc.subject | methods: numerical | en_US |
dc.title | Photon-conserving Comptonization in simulations of accretion discs around black holes | en_US |
dc.type | Journal Article | en_US |
dc.description.version | Accepted Manuscript | en_US |
dc.relation.journal | Mon. Not. R. Astron. Soc. | en_US |
dash.depositing.author | Narayan, Ramesh | |
dc.date.available | 2016-08-02T19:51:43Z | |
dc.identifier.doi | 10.1093/mnras/stv2022 | * |
dash.contributor.affiliated | Narayan, Ramesh | |
dash.contributor.affiliated | Sadowski, Aleksander | |