Soft Lag and Its Implications for X-Ray Time Variations in GRS 1915+105

Details Soft Lag and Its Implications for X-Ray Time Variations in GRS 1915+105 Soft Lag and Its Implications for X-Ray Time Variations in GRS 1915+105

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...621..951o&link_type=abstract

The Astrophysical Journal, Volume 621, Issue 2, pp. 951-958.

Physics

1

Accretion, Accretion Disks, Black Hole Physics, Stars: Individual: Alphanumeric: Grs 1915+105, X-Rays: Stars

Scientific paper

The X-ray time variation of GRS 1915+105 is analyzed, focusing on the phase-lag properties in class θ. The energy and frequency dependence of the soft lag are derived. This energy dependence can be interpreted as Comptonization of high-energy photons by relatively soft electrons with temperatures of less than ~2 keV. A Monte Carlo simulation of the Comptonization of power-law photons by soft electrons is presented. This model can explain the energy spectrum, the energy dependence, and the frequency dependence of the soft lag. The size of the Compton cloud is estimated to be ~2×109 cm by comparing the simulation with the data. The time evolution in class θ, including the dip, is discussed.

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