Broad band variability of SS433: Accretion disk at work?

Details Broad band variability of SS433: Accretion disk at work? Broad band variability of SS433: Accretion disk at work?

2005-01-24

arxiv.org/abs/astro-ph/0501516v1

Astronomy and Astrophysics

Astrophysics

8 pages, 2 figures. Submitted to A&A

Scientific paper

10.1051/0004-6361:20052755

We present broad band power spectra of variations of SS433 in radio, optical and X-ray spectral bands. We show that at frequencies lower than 1e-5 Hz the source demonstrates the same variability pattern in all these bands. The broad band power spectrum can be fitted by one power law down to frequencies ~1e-7 Hz with flattening afterwards. Such a flattening means that on time scales longer than ~1e7 sec the source variability becomes uncorrelated. This naturally leads to the appearance of quasi-poissonian flares in the source light curve, which have been regularly observed in radio and optical spectral bands. The radio flux power spectrum appears to have a second break at Fourier frequencies ~1e-5 Hz which can be caused by the smearing of the intrinsic radio variability on timescale of the light-crossing time of the radio emitting region. We find a correlation of the radio and optical fluxes of SS433 and the radio flux is delayed by about ~2 days with respect to the optical one. Power spectra of optical and X-ray variabilities continue with the same power law from 1e-7 Hz up to ~0.01-0.05 Hz. The broad band power spectrum of SS433 can be interpreted in terms of self-similar accretion rate modulations in the accretion disk proposed by Lyubarskii (1997) and elaborated by Churazov et al. (2001). We discuss a viscous time-scale in the accretion disk of SS433 in implication to the observed broad band power spectrum.

Affiliated with

Also associated with

No associations

Rating

Broad band variability of SS433: Accretion disk at work? 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 Broad band variability of SS433: Accretion disk at work?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Broad band variability of SS433: Accretion disk at work? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-311945