Polarized synchrotron emission in quiescent black hole X-ray transients

Russell, David M., Shahbaz, Tariq, Lewis, Fraser and Gallo, Elena 2016. Polarized synchrotron emission in quiescent black hole X-ray transients. Monthly Notices of the Royal Astronomical Society 463 (3) , pp. 2680-2689. 10.1093/mnras/stw2166

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Abstract

We present near-infrared polarimetric observations of the black hole X-ray binaries Swift J1357.2−0933 and A0620−00. In both sources, recent studies have demonstrated the presence of variable infrared synchrotron emission in quiescence, most likely from weak compact jets. For Swift J1357.2−0933, we find that the synchrotron emission is polarized at a level of 8.0 ± 2.5 per cent (a 3.2σ detection of intrinsic polarization). The mean magnitude and rms variability of the flux (fractional rms of 19–24 per cent in KS band) agree with previous observations. These properties imply a continuously launched (stable on long time-scales), highly variable (on short time-scales) jet in the Swift J1357.2−0933 system in quiescence, which has a moderately tangled magnetic field close to the base of the jet. We find that for A0620–00, there are likely to be three components to the optical–infrared polarization; interstellar dust along the line of sight, scattering within the system, and an additional source that changes the polarization position angle in the reddest (H and KS) wavebands. We interpret this as a stronger contribution of synchrotron emission, and by subtracting the line-of-sight polarization, we measure an excess of ∼1.25 ± 0.28 per cent polarization and a position angle of the magnetic field vector that is consistent with being parallel with the axis of the resolved radio jet. These results imply that weak jets in low-luminosity accreting systems have magnetic fields which possess similarly tangled fields compared to the more luminous, hard state jets in X-ray binaries.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Oxford University Press
ISSN:	00358711
Date of First Compliant Deposit:	1 September 2017
Date of Acceptance:	24 August 2016
Last Modified:	07 Nov 2023 04:27
URI:	https://orca.cardiff.ac.uk/id/eprint/104238

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