Evolution of Thick Accretion Disks Produced by Tidal Disruption Events
| dc.creator | Ulmer, Andrew | |
| dc.date | 1997-08-28 | |
| dc.date.accessioned | 2026-07-07T02:24:06Z | |
| dc.date.available | 2026-07-07T02:24:06Z | |
| dc.description | Geometrically thick disks may form after tidal disruption events, and rapid accretion may lead to short flares followed by long-term, lower-level emission. Using a novel accretion disk code which relies primarily on global conservation laws and the assumption that viscosity is everywhere positive, a broad range of physically allowed evolutionary sequences of thick disks is investigated. The main result is that accretion in the thick disk phase can consume only a fraction of the initial disk material before the disk cools and becomes thin. This fraction is ~0.5-0.9 for disruptions around 10^6 to 10^7 M_\odot black holes and is sensitive to the mean angular momentum of the disk. The residual material will accrete in some form of thin disk over a longer period of time. The initial thick disk phase may reduce the dimming timescale of the disk by a factor of ~2 from estimates based on thin disks alone. Assuming an 0.5 M_\odot initial thick disk, even if the thin disks become advection dominated, the black hole mass to light ratio can rise above M_\odot/L_\odot = 1 in no less than 20 (0.1/α) to 2000 (0.1/α) years following a tidal disruption event, depending on the mass of the black hole and the initial conditions of the encounter. The long-term emission will be most prevalent around lower mass, 10^6 M_\odot black holes. If the tidal disruption rates in these galactic nuclei are ~10^{-4} yr^{-1}, then about 10% of the nuclei should exhibit the long-term UV/optical emission at a level of ~10^{38} ergs~s^{-1}. | |
| dc.description | 32 pages with 6 figures, AAS Latex, ApJ Submitted (August) | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9708265 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9708265 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/11498 | |
| dc.subject | Astrophysics | |
| dc.title | Evolution of Thick Accretion Disks Produced by Tidal Disruption Events | |
| dc.type | text |