Cyg X-1 entered a transitional state, may be on its way from the soft state back to the hard state

Details Cyg X-1 entered a transitional state, may be on its way from the soft state back to the hard state Cyg X-1 entered a transitional state, may be on its way from the soft state back to the hard state

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3307....1g&link_type=abstract

The Astronomer's Telegram, #3307

Astronomy and Astrophysics

Astronomy

2

Radio, X-Ray, Gamma Ray, Binary, Black Hole

Scientific paper

We report on recent RXTE, INTEGRAL, and AMI observations of the HMXB Cyg X-1. After having spent 2006 to mid-2010 in an extraordinarily hard state (Nowak et al., 2011, ApJ 728, 13) the source entered a soft state in summer 2010 (ATel #2711, #2714, #2715, #2721, #2724, #2734, #2751, #2755) which might now be coming to an end. The Swift-BAT hard X-ray flux started to recover, showing an increasing trend starting around 2011-04-18.

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