Disc and wind in black hole X-ray binary MAXI J1820+070 observed through polarized light during its 2018 outburst

Kosenkov, Ilia A.Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.;St Petersburg State Univ, Dept Astrophys, Univ Skiy Pr 28, St Petersburg 198504, Russia. (författare)

QC 20201007
We describe the first complete polarimetric data set of the entire outburst of a low-mass black hole X-ray binary system and discuss the constraints for geometry and radiative mechanisms it imposes. During the decaying hard state, when the optical flux is dominated by the non-thermal component, the observed polarization is consistent with the interstellar values in all filters. During the soft state, the intrinsic polarization of the source is small, similar to 0.15 per cent in B and V filters, and is likely produced in the irradiated disc. A much higher polarization, reaching similar to 0.5 per cent in V and R filters, at a position angle of similar to 25 degrees observed in the rising hard state coincides in time with the detection of winds in the system. This angle coincides with the position angle of the jet. The detected optical polarization is best explained by scattering of the non-thermal (hot flow or jet base) radiation in an equatorial wind.

Veledina, AlexandraStockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland; Space Research Institute of the Russian Academy of Sciences, Russia(Swepub:su)avele (författare)
Berdyugin, Andrei, VUniv Turku, Dept Phys & Astron, FI-20014 Turku, Finland. (författare)
Kravtsov, VadimUniv Turku, Dept Phys & Astron, FI-20014 Turku, Finland. (författare)
Piirola, VilppuUniv Turku, Dept Phys & Astron, FI-20014 Turku, Finland. (författare)
Berdyugina, Svetlana, VLeibniz Inst Sonnenphys, Schoneckstr 6, D-79104 Freiburg, Germany.;Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA. (författare)
Sakanoi, TakeshiTohoku Univ, Grad Sch Sci, Aoba Ku, Sendai, Miyagi 9808578, Japan. (författare)
Kagitani, MasatoTohoku Univ, Grad Sch Sci, Aoba Ku, Sendai, Miyagi 9808578, Japan. (författare)
Poutanen, JuriStockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland; Space Research Institute of the Russian Academy of Sciences, Russia(Swepub:su)jpout (författare)
Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.;St Petersburg State Univ, Dept Astrophys, Univ Skiy Pr 28, St Petersburg 198504, Russia.Nordic Institute for Theoretical Physics NORDITA (creator_code:org_t)

Ingår i:Monthly notices of the Royal Astronomical Society: OXFORD UNIV PRESS496:1, s. L96-L1000035-87111365-29661745-39251745-3933

Av författaren/redakt...: Kosenkov, Ilia A ...; Veledina, Alexan ...; Berdyugin, Andre ...; Kravtsov, Vadim; Piirola, Vilppu; Berdyugina, Svet ...; visa fler...; Sakanoi, Takeshi; Kagitani, Masato; Poutanen, Juri; visa färre...

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