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Polarized X-Rays fr...
Polarized X-Rays from Windy Accretion in Cygnus X-1
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- Poutanen, Juri (författare)
- Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.
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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,,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland
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- Beloborodov, Andrei M. (författare)
- Columbia Univ, Phys Dept, 538 West 120th St, New York, NY 10027 USA.;Columbia Univ, Columbia Astrophys Lab, 538 West 120th St, New York, NY 10027 USA.;Max Planck Inst Astrophys, Karl-Schwarzschild-Str 1, D-85741 Garching, Germany.
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Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland 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. ; 949:1
- Relaterad länk:
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Recent X-ray polarimetric data on the prototypical black hole X-ray binary Cyg X-1 from the Imaging X-ray Polarimetry Explorer present tight constraints on accretion geometry in the hard spectral state. Contrary to general expectations of a low, less than or similar to 1% polarization degree (PD), the observed average PD was found to be a factor of 4 higher. Aligned with the jet position angle on the sky, the observed polarization favors geometry of the X-ray emission region stretched normally to the jet in the accretion disk plane. The high PD is, however, difficult to reconcile with the low orbital inclination of the binary i approximate to 30 degrees. We suggest that this puzzle can be explained if the emitting plasma is outflowing with a mildly relativistic velocity greater than or similar to 0.4 c. Our radiative transfer simulations show that Comptonization in the outflowing medium elongated in the plane of the disk and radiates X-rays with the degree and direction of polarization consistent with observations at i approximate to 30 degrees.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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