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03 November 2024
 
  » arxiv » astro-ph/9711199

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Tidal Disruption Eddington Envelopes around Massive Black Holes
Andrew Ulmer ; Bohdan Paczynski ; Jeremy Goodman ;
Date 18 Nov 1997
Subject astro-ph
Affiliation MPI fuer Astrophysik, Garching; Princeton University Observatory
AbstractOptically-thick envelopes may form following the tidal disruption of a star by a massive black hole. Such envelopes would reprocess hard radiation from accretion close to the black hole into the UV and optical bands producing AGN-luminosity flares with duration ~1 year. We show that due to relativistic effects, the envelopes are convective. If convection is efficient, then the structure of the envelopes is similar to that described in previous work; however, the photospheric radius is shown to be very sensitive to the luminosity at the envelope base, suggesting that either the envelope collapses or the envelope expands to a maximum radius at which point a wind may set in. For an envelope without winds, we find a maximum photospheric radius of ~10^16 cm (i.e. minimum effective temperature ~6,000 K). The evolution of the envelopes is described based on simple energy arguments.
Source arXiv, astro-ph/9711199
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