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Peering into the ti...
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Kravtsov, VadimDepartment of Physics and Astronomy, 20014 University of Turku, Finland
(författare)
Peering into the tilted heart of Cyg X-1 with high-precision optical polarimetry
- Artikel/kapitelEngelska2023
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EDP Sciences,2023
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LIBRIS-ID:oai:DiVA.org:kth-338860
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-338860URI
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https://doi.org/10.1051/0004-6361/202346932DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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QC 20231031
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We present high-precision optical polarimetric observations of the black hole X-ray binary Cygnus X-1 that span several cycles of its 5.6-day orbital period. The week-long observations on two telescopes located in opposite hemispheres allowed us to track the evolution of the polarization within one orbital cycle with the highest temporal resolution to date. Using the field stars, we determined the interstellar polarization in the source direction and subsequently its intrinsic polarization Pint = 0.82%±0.15% with a polarization angle θint = 155 ±5. The optical polarization angle is aligned with that in the X-rays recently obtained with the Imaging X-ray Polarimetry Explorer. Furthermore, it is consistent within the uncertainties with the position angle of the radio ejections. We show that the intrinsic polarization degree is variable with the orbital period with an amplitude of ∼0.2% and discuss various sites of its production. Assuming that the polarization arises from a single Thomson scattering of the primary star radiation by the matter that follows the black hole in its orbital motion, we constrained the inclination of the binary orbit i > 120 and its eccentricity e < 0.08. The asymmetric shape of the orbital profiles of the Stokes parameters also implies the asymmetry of the scattering matter distribution in the orbital plane, which may arise from the tilted accretion disk. We compared our data to the polarimetric observations made in 1975"1987 and find good agrement within 1 between the intrinsic polarization angles. On the other hand, the polarization degree decreased by 0.4% over half a century, suggesting secular changes in the geometry of the accreting matter.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Veledina, AlexandraNordita SU; Department of Physics and Astronomy, 20014 University of Turku, Finland(Swepub:kth)u1inuybx
(författare)
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Berdyugin, Andrei V.Department of Physics and Astronomy, 20014 University of Turku, Finland
(författare)
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Zdziarski, Andrzej A.Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warszawa, Poland, Bartycka 18
(författare)
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Henson, Gary D.Department of Physics and Astronomy, East Tennessee State University, Johnson City, TN 37614, USA
(författare)
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Piirola, VilppuDepartment of Physics and Astronomy, 20014 University of Turku, Finland
(författare)
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Sakanoi, TakeshiGraduate School of Sciences, Tohoku University, Aoba-ku, 980-8578 Sendai, Japan, Aoba-ku
(författare)
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Kagitani, MasatoGraduate School of Sciences, Tohoku University, Aoba-ku, 980-8578 Sendai, Japan, Aoba-ku
(författare)
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Berdyugina, Svetlana V.Leibniz-Institut für Sonnenphysik, Schöneckstr. 6, 79104 Freiburg, Germany, Schöneckstr. 6; Istituto Ricerche Solari Aldo e Cele Daccò (IRSOL), Faculty of Informatics, Università della Svizzera italiana, 6605 Locarno, Switzerland
(författare)
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Poutanen, JuriDepartment of Physics and Astronomy, 20014 University of Turku, Finland
(författare)
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Department of Physics and Astronomy, 20014 University of Turku, FinlandNordita SU; Department of Physics and Astronomy, 20014 University of Turku, Finland
(creator_code:org_t)
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Ingår i:Astronomy and Astrophysics: EDP Sciences6780004-63611432-0746
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Kravtsov, Vadim
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Veledina, Alexan ...
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Berdyugin, Andre ...
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Zdziarski, Andrz ...
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Henson, Gary D.
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Piirola, Vilppu
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visa fler...
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Sakanoi, Takeshi
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Kagitani, Masato
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Berdyugina, Svet ...
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Poutanen, Juri
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