(2017) A precise measurement of the magnetic field in the corona of the black hole binary V404 Cygni. Science, 358 (6368). pp. 1299-1302. doi:10.1126/science.aan0249 ISSN 0036-8075.

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Abstract

Observations of binary stars containing an accreting black hole or neutron star often show x-ray emission extending to high energies (>10 kilo­–electron volts), which is ascribed to an accretion disk corona of energetic particles akin to those seen in the solar corona. Despite their ubiquity, the physical conditions in accretion disk coronae remain poorly constrained. Using simultaneous infrared, optical, x-ray, and radio observations of the Galactic black hole system V404 Cygni, showing a rapid synchrotron cooling event in its 2015 outburst, we present a precise 461 ± 12 gauss magnetic field measurement in the corona. This measurement is substantially lower than previous estimates for such systems, providing constraints on physical models of accretion physics in black hole and neutron star binary systems.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Science
Publisher:	American Association for the Advancement of Science
ISSN:	0036-8075
Official Date:	8 December 2017
Dates:	Date Event 8 December 2017 Published 3 November 2017 Accepted
Volume:	358
Number:	6368
Page Range:	pp. 1299-1302
DOI:	10.1126/science.aan0249
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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