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

Open Access
Authors
  • V. Grinberg
  • M. Boeck
  • K. Pottschmidt
  • G.G. Pooley
  • J. Wilms
  • M.A. Nowak
  • M. Cadolle Bel
  • J. Rodriguez
  • P. Laurent
  • D.M. Marcu
  • P. Uttley
  • J.A. Tomsick
  • A. Bodaghee
  • S. Markoff
  • I. Kreykenbohm
Publication date 27-04-2011
Journal The astronomer's telegram
Volume | Issue number 3307
Organisations
  • Faculty of Science (FNWI) - Anton Pannekoek Institute for Astronomy (API)
Abstract 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.
Document type Article
Language English
Published at http://www.astronomerstelegram.org/?read=3307
Other links https://ui.adsabs.harvard.edu/abs/2011ATel.3307....1G/abstract
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Cyg X-1 entered a transitional state (Final published version)
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