Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 891, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/ab7998
Keywords
Galactic center; Black hole physics; Non-thermal radiation sources; Accretion
Categories
Funding
- Argentine National Scientific and Technical Research Council (CONICET) [PIP 2014-00338]
- National Agency for Scientific and Technological Promotion [PICT 2017-0898]
- FundacAo de Amparo a Pesquisa do Estado de SAo Paulo (FAPESP) [2017/01461-2]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [142320/2016-1]
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The Galactic center supermassive black hole, Sgr A*, has experienced a strong, unprecedented flare in 2019 May when its near-infrared luminosity reached much brighter levels than ever measured. We argue that an explosive event of particle acceleration to nonthermal energies in the innermost parts of the accretion flow-a nonthermal bomb-explains the near-infrared light curve. We discuss potential mechanisms that could explain this event such as magnetic reconnection and relativistic turbulence acceleration. Multiwavelength monitoring of such superflares in radio, infrared, and X-rays should allow a concrete test of the nonthermal bomb model and put better constraints on the mechanism that triggered the bomb.
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