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Article overview
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Particle Acceleration and the Origin of X-ray Flares in GRMHD simulations of Sgr A* | | David Ball
; Feryal Ozel
; Dimitrios Psaltis
; Chi-kwan Chan
; | | Date: |
18 Feb 2016 | | Abstract: | Significant X-ray variability and flaring has been observed from Sgr A* but
is poorly understood from a theoretical standpoint. We perform GRMHD
simulations that take into account a population of non-thermal electrons with
energy distributions and injection rates that are motivated by PIC simulations
of magnetic reconnection. We explore the effects of including these non-thermal
electrons on the predicted broadband variability of Sgr A* and find that X-ray
variability is a generic result of localizing non-thermal electrons to highly
magnetized regions, where particles are likely to be accelerated via magnetic
reconnection. The proximity of these high-field regions to the event horizon
forms a natural connection between IR and X-ray variability and accounts for
the rapid timescales associated with the X-ray flares. The qualitative nature
of this variability is consistent with observations, producing X-ray flares
that are always coincident with IR flares, but not vice versa, i.e., there are
a number of IR flares without X-ray counterparts. | | Source: | arXiv, 1602.5968 | | Services: | Forum | Review | PDF | Favorites | |
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