Quasi-periodic oscillations from accretion disk coronas

Details Quasi-periodic oscillations from accretion disk coronas Quasi-periodic oscillations from accretion disk coronas

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.319..648b&link_type=abstract

Nature (ISSN 0028-0836), vol. 319, Feb. 20, 1986, p. 648, 649. Research supported by the Royal Society.

Computer Science

30

Accretion Disks, Coronas, Stellar Oscillations, X Ray Sources, Binary Stars, Galactic Bulge, Neutron Stars

Scientific paper

It is argued that a connection exists between the phenomenon of quasi-periodic oscillations (QPOs) and the formation of Compton-heated accretion disks coronas in galactic bulge X-ray sources. In particular, the frequencies of the QPOs are identified with those of oscillations of disturbances in the inner regions of a corona above the accretion disk. Observations indicate that the oscillations occur predominantly at the keplerian angular frequency of disk matter about the central object and have low coherence. This model would explain the observed variations in the centroid frequencies of QPOs in GX5-1, Sco X-1, and Cyg X-1. The variation of QPOs frequencies relative to the photon spectra of these sources is predicted.

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