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Evidence for a Blac...
Evidence for a Black Hole Spin-Orbit Misalignment in the X-Ray Binary Cyg X-1
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- Zdziarski, Andrzej A. (författare)
- Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland.
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- Veledina, Alexandra, 1987- (författare)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.;Stockholm Univ, Hannes Alfvens vag 12, S-10691 Stockholm, Sweden.,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland
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- Szanecki, Michal (författare)
- Univ Lodz, Fac Phys & Appl Informat, Pomorska 149-153, PL-90236 Lodz, Poland.
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- Green, David A. (författare)
- Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England.
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- Bright, Joe S. (författare)
- Univ Oxford, Dept Phys, Astrophys, Keble Rd, Oxford OX1 3RH, England.
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- Williams, David R. A. (författare)
- Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, England.
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Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland Nordic Institute for Theoretical Physics NORDITA (creator_code:org_t)
- American Astronomical Society, 2023
- 2023
- Engelska.
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Ingår i: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 951:2
- Relaterad länk:
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https://doi.org/10.3...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Ämnesord
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- Recently, the accretion geometry of the black hole X-ray binary Cyg X-1 was probed with the X-ray polarization. The position angle of the X-ray-emitting flow was found to be aligned with the position angle of the radio jet in the plane of the sky. At the same time, the observed high polarization degree could be obtained only for a high inclination of the X-ray-emitting flow, indicating a misalignment between the binary axis and the black hole spin. The jet, in turn, is believed to be directed by the spin axis; hence, a similar misalignment is expected between the jet and binary axes. We test this hypothesis using very long (up to about 26 yr) multiband radio observations. We find a misalignment of 20 & DEG;-30 & DEG;. However, contrary to the earlier expectations, the jet and binary viewing angles are found to be similar, while the misalignment is seen between the position angles of the jet and the binary axis on the plane of the sky. Furthermore, the presence of the misalignment calls into question our understanding of the evolution of this binary system.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- art (ämneskategori)
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