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A precise measurement of the magnetic field in the corona of the black hole binary V404 Cygni

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

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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:Article
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Fürst, Felix0000-0003-0388-0560
Additional Information:© 2017 American Association for the Advancement of Science. Received 22 February 2017; accepted 3 November 20. The near-infrared light curve is based on observations made with the Gran Telescopio Canarias, installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, in the island of La Palma, during science commissioning of CIRCE. Development of CIRCE was supported by the University of Florida and the National Science Foundation (grant AST-0352664), in collaboration with the Inter-University Centre for Astronomy and Astrophysics. The William Herschel Telescope is operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. The ULTRACAM team and P.G. (grant ST/J003697/2) acknowledge the financial support of the U.K. Science and Technology Facilities Council. This research has made use of data obtained with NuSTAR, a project led by the California Institute of Technology, funded by NASA and managed by NASA/Jet Propulsion Laboratory, and has used the NUSTARDAS software package, jointly developed by the Agenzia Spaziale Italiana Science Data Center (Italy) and California Institute of Technology (USA). A.J.C.-T. acknowledges support from the Spanish Ministry Project AYA2015-71718-R. We thank S. Markoff, C. Ceccobello, and T. Maccarone for comments on the scientific discussion. The multiwavelength lightcurves are provided as data file S1, and our derived measurements are listed in table S1. The observational data are available for each instrument: CIRCE at; ULTRACAM at (in ULTRACAM pipeline binary format); NuSTAR at; and AMI at (in radio Flexible Image Transport System format).
Group:Space Radiation Laboratory, NuSTAR
Funding AgencyGrant Number
University of FloridaUNSPECIFIED
Science and Technology Facilities Council (STFC)ST/J003697/2
Ministerio de Ciencia e Innovación (MCINN)AYA2015-71718-R
Issue or Number:6368
Record Number:CaltechAUTHORS:20171211-081010239
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83784
Deposited By: Tony Diaz
Deposited On:11 Dec 2017 20:23
Last Modified:15 Nov 2021 20:14

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