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High-energy gamma-ray observations of the accreting black hole V404 Cygni during its 2015 June outburst
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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5
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Monthly Notices of the Royal Astronomical Society: Letters, Volume 462, issue 1, pp. L111-L115
Abstract
We report on Fermi/Large Area Telescope observations of the accreting black hole low-mass X-ray binary V404 Cygni during its outburst in 2015 June-July. Detailed analyses reveal a possible excess of γ -ray emission on 2015 26 June, with a very soft spectrum above 100 MeV, at a position consistent with the direction of V404 Cyg (within the 95 per cent confidence region and a chance probability of 4 × 10-4). This emission cannot be associated with any previously known Fermi source. Its temporal coincidence with the brightest radio and hard X-ray flare in the light curve of V404 Cyg, at the end of the main active phase of its outburst, strengthens the association with V404 Cyg. If the γ -ray emission is associated with V404 Cyg, the simultaneous detection of 511 keV annihilation emission by INTEGRAL reqires that the high-energy γ -rays originate away from the corona, possibly in a Blandford-Znajek jet. The data give support to models involving a magnetically arrested disc where a bright γ -ray jet can re-form after the occurrence of a major transient ejection seen in the radio.
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Loh, A, Corbel, S, Dubus, G, Rodriguez, J, Grenier, I, Hovatta, T, Pearson, T, Readhead, A, Fender, R & Mooley, K 2016, 'High-energy gamma-ray observations of the accreting black hole V404 Cygni during its 2015 June outburst', Monthly Notices of the Royal Astronomical Society: Letters, vol. 462, no. 1, pp. L111-L115. https://doi.org/10.1093/mnrasl/slw142