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Integral SPI* observations of cygnus x-1 in the soft state: What about the jet contribution in hard x-rays?
Université de Toulouse, France.ORCID iD: 0000-0003-1999-2161
2014 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 789, no 1, 26Article in journal (Refereed) Published
Abstract [en]

During the first 7 yr of the INTEGRAL mission (2003-2009), Cyg X-1 has essentially been detected in its hard state (HS), with some incursions in intermediate HSs. This long, spectrally stable period allowed in particular the measurement of the polarization of the high-energy component that has long been observed above 200 keV in this peculiar object. This result strongly suggests that here we see the contribution of the jet, known to emit a strong synchrotron radio emission. In 2010 June, Cyg X-1 underwent a completed transition toward a soft state (SS). It gave us the unique opportunity to study in detail the corona emission in this spectral state, and to investigate in particular the behavior of the jet contribution. Indeed, during the SS, the hard X-ray emission decreases drastically, with its maximum energy shifted toward lower energy and its flux divided by a factor of 5-10. Interestingly, the radio emission follows a similar drop, supporting the correlation between the jet emission and the hard component, even though the flux is too low to quantify the polarization characteristics.

Place, publisher, year, edition, pages
2014. Vol. 789, no 1, 26
Keyword [en]
methods: observational, polarization, radiation mechanisms: general, X-rays: binaries, X-rays: individual (Cyg X-1)
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-161769DOI: 10.1088/0004-637X/789/1/26ISI: 000338103400026ScopusID: 2-s2.0-84902580934OAI: diva2:795681

QC 20150317

Available from: 2015-03-17 Created: 2015-03-17 Last updated: 2015-03-17Bibliographically approved

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Chauvin, Maxime
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