Quasi-periodic variability and the inner radii of thin accretion disks in galactic black hole systems

Tiziana Di Matteo, Dimitrios Psaltis

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

We calculate upper bounds on the inner radii of geometrically thin accretion disks in galactic black hole systems by relating their rapid variability properties to those of neutron stars. We infer that the inner disk radii do not exhibit large excursions between different spectral states, in contrast with the concept that the disk retreats significantly during the soft-to-hard-state transition. We find that, in the hard state, the accretion disks extend down to radii ≲6-25 GM/c2 and discuss the implications of our results for models of black hole X-ray spectra.

Original languageEnglish (US)
Pages (from-to)L101-L104
JournalAstrophysical Journal
Volume526
Issue number2 PART 2
StatePublished - Dec 1 1999
Externally publishedYes

Keywords

  • Accretion, accretion disks
  • Black hole physics
  • X-rays: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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