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Optical polarization signatures of black hole X-ray binaries
Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.
Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.
Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.;Stockholm Univ, Hannes Alfvens Veg 12, SE-10691 Stockholm, Sweden.;Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia..ORCID iD: 0000-0002-5767-7253
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2022 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 514, no 2, p. 2479-2487Article in journal (Refereed) Published
Abstract [en]

Polarimetry provides an avenue for probing the geometry and physical mechanisms producing optical radiation in many astrophysical objects, including stellar binary systems. We present the results of multiwavelength (BVR) polarimetric studies of a sample of historical black hole X-ray binaries, observed during their outbursts or in the quiescent (or near-quiescent) state. We surveyed both long- and short-period systems, located at different Galactic latitudes. We performed careful analysis of the interstellar polarization in the direction on the sources to reliably estimate the intrinsic source polarization. Intrinsic polarization was found to be small (<0.2 per cent) in sources observed in bright soft states (MAXI J0637-430 and 4U 1957+115). It was found to be significant in the rising hard state of MAXI J1820+070 at the level of similar to 0.5 per cent and negligible in the decaying hard state and during its failed outbursts, while Swift J1357.2-0933 showed its absence in the rising hard state. Three (XTE J1118+480 , V4641 Sgr , V404 Cyg) sources observed during quiescence show no evidence of significant intrinsic polarization, while MAXI J1820+070 is the only black hole X-ray binary which showed substantial (>5 per cent) intrinsic quiescent-state polarization with a blue spectrum. The absence of intrinsic polarization at the optical wavelengths puts constraints on the potential contribution of non-stellar (jet, hot flow, accretion disc) components to the total spectra of black hole X-ray binaries.

Place, publisher, year, edition, pages
Oxford University Press (OUP) , 2022. Vol. 514, no 2, p. 2479-2487
Keywords [en]
polarization, X-rays: binaries
National Category
Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:kth:diva-315252DOI: 10.1093/mnras/stac1470ISI: 000813280300007Scopus ID: 2-s2.0-85133672207OAI: oai:DiVA.org:kth-315252DiVA, id: diva2:1679165
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QC 20230619

Available from: 2022-06-30 Created: 2022-06-30 Last updated: 2023-06-19Bibliographically approved

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Veledina, Alexandra

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