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Comprehensive coverage of particle acceleration and kinetic feedback from the stellar mass black hole V404 Cygni

Fender, R. P. and Mooley, K. P. and Motta, S. E. and Bright, J. S. and Williams, D. R. A. and Rushton, A. P. and Beswick, R. J. and Miller-Jones, J. C. A. and Kimura, M. and Isogai, Keisuke and Kato, T. (2023) Comprehensive coverage of particle acceleration and kinetic feedback from the stellar mass black hole V404 Cygni. Monthly Notices of the Royal Astronomical Society, 518 (1). pp. 1243-1259. ISSN 0035-8711. doi:10.1093/mnras/stac1836.

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We present analysis of comprehensive radio observations of the black hole V404 Cyg during its 2015 outburst. These data represent the best ever coverage of jet production and particle acceleration from any black hole. We report for the first time a clear and near-linear flux–rms correlation in the radio flux densities. Investigation of individual flares reveals in nearly all cases the peak corresponds to the transition from optically thick to thin to synchrotron emission, but an extended phase of particle acceleration is required in contrast to simple impulsive injection models. The largest radio flare is preceded by a phase of optical oscillations and followed one day later by a smaller but optically thin flare, likely due to ejecta interacting with the interstellar medium. Comparing the radio emission to contemporaneous X-ray and optical data, we find that the X-ray and radio measurements are correlated on all time-scales from seconds to one day. Correlation with the optical flux densities is weak at short time-scales, but becomes significant on time-scales greater than a few hours. We evaluate the physical conditions (size, magnetic field, and internal energy) associated with 86 individual radio flares, which in turn allows us to place a lower limit on the kinetic feedback over the 15 d of intense activity. If this energy was deposited locally to the source, as implied by the failure to detect jets on angular scales larger than milliarcsec, then we predict that a nova-like shell could have been formed.

Item Type:Article
Related URLs:
URLURL TypeDescription
Fender, R. P.0000-0002-5654-2744
Mooley, K. P.0000-0002-2557-5180
Motta, S. E.0000-0002-6154-5843
Bright, J. S.0000-0002-7735-5796
Williams, D. R. A.0000-0001-7361-0246
Miller-Jones, J. C. A.0000-0003-3124-2814
Kimura, M.0000-0001-8135-9207
Isogai, Keisuke0000-0002-6480-3799
Additional Information:RF would like to acknowledge valuable conversations with Jorge Casares about the optical properties of V404 Cyg, with Lauren Rhodes and Alexander van der Horst about models for GRB radio emission, and with Adam Ingram and Phil Uttley about the radio flux-rms relation. RF was partly funded by ERC Advanced Investigator Grant 267607 ‘4 PI SKY’. This research made use of many scientific software packages, including GNUPLOT, SCIPY, and MATHEMATICA. All of the radio data presented in this study are available for you to use for your own studies (please contact the authors). eMERLIN, funded by the STFC, is a National Facility operated by the University of Manchester at Jodrell Bank Observatory. We thank the Mullard Radio Astronomy Observatory staff for scheduling and carrying out the AMI-LA observations. The AMI telescope was supported by the ERC under grant 307215 ‘LODESTONE’, STFC, and the University of Cambridge. We thank the anonymous referee for useful feedback and comments.
Funding AgencyGrant Number
European Research Council (ERC)267607
European Research Council (ERC)307215
Science and Technology Facilities Council (STFC)UNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20230203-893794600.47
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ID Code:119039
Deposited By: Research Services Depository
Deposited On:02 Mar 2023 17:40
Last Modified:02 Mar 2023 17:40

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