2006A&A...447..545R


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.20CET14:53:16

2006A&A...447..545R - Astronomy and Astrophysics, volume 447, 545-551 (2006/2-4)

Broad band variability of SS433: accretion disk at work?

REVNIVTSEV M., FABRIKA S., ABOLMASOV P., POSTNOV K., BIKMAEV I., BURENIN R., PAVLINSKY M., SUNYAEV R., KHAMITOV I. and SAKHIBULLIN N.

Abstract (from CDS):

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 10–5Hz 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 ∼ 10–7Hz with flattening afterwards. Such a flattening means that on time scales longer than ∼ 107s 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 ∼10–5Hz 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 10–7Hz up to ∼0.01-0.05Hz. 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 (1997MNRAS.292..679L) and elaborated by Churazov et al. (2001MNRAS.321..759C). We discuss a viscous time-scale in the accretion disk of SS433 with reference to the observed broad band power spectrum.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - black hole physics - instabilities - stars: binaries: general - X-rays: general - X-rays: stars

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1905 0
2 SS 433 HXB 19 11 49.5645897701 +04 58 57.824087535   16.3 13.0     A7Ib: 1910 3
3 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3878 0

    Equat.    Gal    SGal    Ecl

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2020.02.20-14:53:16

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