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Volume 288 - Accretion Processes in Cosmic Sources (APCS2016) - ACCRETION ONTO WHITE DWARFS, NEUTRON STARS & BLACK HOLES
Time lag in transient cosmic accreting sources
G. Bisnovatyi-Kogan,* F. Giovannelli
*corresponding author
Full text: pdf
Pre-published on: 2018 March 06
Published on: 2018 May 16
Models are developed for time lag between maxima of the source brightness in different wave-
lengths during a transient flash of luminosity connected with a short period of increase of the
mass flux onto the central compact object. A simple formula is derived for finding the time delay
among events in different wavelengths, valid in general for all disk accreting cosmic sources. In
close binaries with accretion disks the time lag is connected with effects of viscosity defining a
radial motion of matter in the accretion disk. In AGN flashes, the falling matter has a low angular
momentum, and the time lag is defined by the free fall time to the gravitating center. The validity
of these models is shown by means of several examples of galactic and extragalactic accreting
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