EDP Sciences
Free access
Issue
A&A
Volume 383, Number 3, March I 2002
Page(s) L35 - L38
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20020091


A&A 383, L35-L38 (2002)
DOI: 10.1051/0004-6361:20020091

Letter

Disk-jet connection in Cygnus X-3

M. Choudhury1, A. R. Rao1, S. V. Vadawale1, C. H. Ishwara-Chandra2 and A. K. Jain2

1  Tata Institute of Fundamental Research, Mumbai 400005, India
2  ISRO Satellite Center, Bangalore 560017, India

(Received 19 November 2001 / Accepted 16 January 2002 )

Abstract
We present the results of a detailed correlation study between the soft X-ray, hard X-ray, and radio emission (obtained from $RXTE \ ASM$, BATSE, and GBI observations, respectively) of the bright radio emitting Galactic X-ray binary Cygnus X-3. We detect a very strong positive correlation between the soft X-ray and radio emission during the low-hard and minor flaring periods of the source, and an anti-correlation between the soft and hard X-ray emissions. We present statistical arguments to suggest that the anti-correlation between the radio and hard X-ray emission, reported earlier, is primarily due to their correlation and anti-correlation, respectively, with the soft X-ray emission. We make a wide band X-ray spectral study using the pointed RXTE observations and detect a pivotal behaviour in the X-ray spectrum. We argue that this X-ray spectral pivoting is responsible for the anti-correlation between the soft and hard X-ray emissions. The strong correlation between the soft X-ray and radio emission suggests a close link between the accreting mechanism, plasma cloud surrounding the compact object and the radio emission.


Key words: accretion -- binaries: close -- stars: individual: Cygnus X-3 -- radio continuum: stars -- X-rays: binaries

Offprint request: M. Choudhury, manojulu@tifr.res.in

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