Black hole accretion

Ramesh Narayan, Eliot Quataert

Research output: Contribution to journalReview article

33 Scopus citations

Abstract

Black holes are most often detected by the radiation produced when they gravitationally pull in surrounding gas, in a process called accretion. The efficiency with which the hot gas radiates its thermal energy strongly influences the geometry and dynamics of the accretion flow. Both radiatively efficient thin disks and radiatively inefficient thick disks are observed. When the accreting gas gets close to the central black hole, the radiation it produces becomes sensitive to the spin of the hole and the presence of an event horizon. Analysis of the luminosities and spectra of accreting black holes has yielded tantalizing evidence for both rotating holes and event horizons. Numerical simulations imply that the relativistic jets often seen from accreting black holes may be powered in part by the spin of the hole.

Original languageEnglish (US)
Pages (from-to)77-80
Number of pages4
JournalScience
Volume307
Issue number5706
DOIs
StatePublished - Jan 7 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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