Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...543l.141l&link_type=abstract
The Astrophysical Journal, Volume 543, Issue 2, pp. L141-L144.
Physics
13
Accretion, Accretion Disks, Black Hole Physics, Stars: Individual: Alphanumeric: Grs 1915+105, X-Rays: Stars
Scientific paper
Through studying the hard lags between the soft (3.3-5.8 keV) and hard (13.0-41.0 keV) photons of the 0.5-10 Hz quasi-periodic oscillations (QPOs) in GRS 1915+105, we have classified them into three types: 0.5-2.0, 2.0-4.5, and 4.5-10 Hz QPOs. They are closely related to different temporal and spectral states. The first type of QPO (0.5-2 Hz) has positive hard lags at both the QPO fundamental and first harmonic frequencies. These QPOs were observed in the quiescent soft state. The second type of QPO (2-4.5 Hz) was also detected in the quiescent soft state; these QPOs have opposite signs of hard lags at the QPO fundamental and first harmonic frequencies. The third type (4.5-10 Hz), which showed up in medium soft quiescent/outburst states, does not have significant higher harmonic peaks. There is a smooth transition between these three types of QPO behaviors. We did not detect 0.5-10 Hz QPOs in the very soft state. We discuss some of the implications of these results.
Böttcher Markus
Liang Edison P.
Lin Dacheng
Smith Ian A.
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