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

Author:

Kosenkov Ilia A12ORCID,Veledina Alexandra134ORCID,Berdyugin Andrei V1,Kravtsov Vadim1,Piirola Vilppu1,Berdyugina Svetlana V56,Sakanoi Takeshi7,Kagitani Masato7,Poutanen Juri134ORCID

Affiliation:

1. Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland

2. Department of Astrophysics, St Petersburg State University, Universitetskiy pr. 28, Peterhof, St Petersburg 198504, Russia

3. Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden

4. Space Research Institute of the Russian Academy of Sciences, Profsoyuznaya Str 84/32, Moscow 117997, Russia

5. Leibniz-Institut für Sonnenphysik, Schöneckstr 6, D-79104 Freiburg, Germany

6. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822-1897, USA

7. Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan

Abstract

ABSTRACT 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, ∼0.15 per cent in B and V filters, and is likely produced in the irradiated disc. A much higher polarization, reaching ∼0.5 per cent in V and R filters, at a position angle of ∼25○ 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.

Funder

Magnus Ehrnrooth Foundation

Academy of Finland

Russian Science Foundation

ERC

Leibniz Association

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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