QPOs and Spectral States in GRS 1915+105

Details QPOs and Spectral States in GRS 1915+105 QPOs and Spectral States in GRS 1915+105

1999-04-07

arxiv.org/abs/astro-ph/9904087v1

Astronomy and Astrophysics

Astrophysics

28 pages, 10 figures, prepared with aastex macros submitted to the Astrophysical Journal

Scientific paper

We present results from the analysis of X-ray energy spectra and quasi- periodic oscillations (QPOs) from a set of observations which samples a broad range of time variability in GRS 1915+105. We first demonstrate that the frequency and integrated amplitude of a 0.5-10 Hz QPO is correlated with the apparent temperature of the accretion disk for the majority of observations. We then show that the behavior of GRS 1915+105 exhibits two distinct modes of accretion. In the first mode, the QPO is present between 0.5--10 Hz, variability in the source luminosity is dominated by the power law component. In the second mode, the QPO is absent, the changes in the luminosity are dominated by thermal emission from the accretion disk. We find that the color radius and temperature of the inner accretion disk are empirically related by $R_{col} \propto T_{col}^{-2} + const$. We discuss these results in terms of ongoing efforts to explain the origin of both the QPOs and the hard X-ray component in the spectrum of GRS 1915+105.

Affiliated with

Also associated with

No associations

Rating

QPOs and Spectral States in GRS 1915+105 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with QPOs and Spectral States in GRS 1915+105, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and QPOs and Spectral States in GRS 1915+105 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-196412