SwePub
Sök i LIBRIS databas

  Extended search

onr:"swepub:oai:DiVA.org:kth-228215"
 

Search: onr:"swepub:oai:DiVA.org:kth-228215" > Accretion geometry ...

  • 1 of 1
  • Previous record
  • Next record
  •    To hitlist

Accretion geometry of the black-hole binary Cygnus X-1 from X-ray polarimetry

Chauvin, Maxime (author)
KTH,Partikel- och astropartikelfysik,The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, Stockholm, Sweden
Florén, Hans-Gustav (author)
Stockholms universitet,Institutionen för astronomi
Friis, Mette (author)
KTH,Fysik,The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, Stockholm, SwedenThe Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, Stockholm, Sweden
show more...
Jackson, Miranda (author)
KTH,Fysik
Kamae, Tuneyoshi (author)
Kataoka, Jun (author)
Kawano, Takafumi (author)
Kiss, Mózsi, 1982- (author)
KTH,Partikel- och astropartikelfysik
Mikhalev, Victor (author)
KTH,Partikel- och astropartikelfysik
Mizuno, Tsunefumi (author)
Ohashi, Norie (author)
Stana, Theodor (author)
KTH,Fysik
Tajima, Hiro (author)
Takahashi, Hiromitsu (author)
Uchida, Nagomi (author)
Pearce, Mark, 1970- (author)
KTH,Fysik
show less...
 (creator_code:org_t)
2018-06-25
2018
English.
In: Nature Astronomy. - : Nature Publishing Group. - 2397-3366. ; 2:8, s. 652-655
Related links:
http://arxiv.org/pdf...
show more...
https://urn.kb.se/re...
https://doi.org/10.1...
https://urn.kb.se/re...
show less...
  • Journal article (peer-reviewed)
Abstract Subject headings
Close  
  • Black hole binary (BHB) systems comprise a stellar-mass black hole and a closely orbiting companion star. Matter is transferred from the companion to the black hole, forming an accretion disk, corona and jet structures. The resulting release of gravitational energy leads to the emission of X-rays1. The radiation is affected by special/general relativistic effects, and can serve as a probe for the properties of the black hole and surrounding environment, if the accretion geometry is properly identified. Two competing models describe the disk–corona geometry for the hard spectral state of BHBs, based on spectral and timing measurements2,3. Measuring the polarization of hard X-rays reflected from the disk allows the geometry to be determined. The extent of the corona differs between the two models, affecting the strength of the relativistic effects (such as enhancement of the polarization fraction and rotation of the polarization angle). Here, we report observational results on the linear polarization of hard X-ray emission (19–181 keV) from a BHB, Cygnus X-14, in the hard state. The low polarization fraction, <8.6% (upper limit at a 90% confidence level), and the alignment of the polarization angle with the jet axis show that the dominant emission is not influenced by strong gravity. When considered together with existing spectral and timing data, our result reveals that the accretion corona is either an extended structure, or is located far from the black hole in the hard state of Cygnus X-1.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Publication and Content Type

ref (subject category)
art (subject category)

Find in a library

To the university's database

  • 1 of 1
  • Previous record
  • Next record
  •    To hitlist

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Close

Copy and save the link in order to return to this view