Flares from Sgr A* and their Emission Mechanism

K. Dodds-Eden, D. Porquet, G. Trap, Eliot Quataert, S. Gillessen, N. Grosso, R. Genzel, A. Goldwurm, Farhad Y Zadeh

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We summarize recent observations and modeling of the brightest Sgr A* flare to be observed simultaneously in (near)-infrared and X-rays to date. Trying to explain the spectral characteristics of this flare through inverse Compton mechanisms implies physical parameters that are unrealistic for Sgr A*. Instead, a “cooling break” synchrotron model provides a more feasible explanation for the X-ray emission. In a magnetic field of about 5-30 Gauss the X-ray emitting electrons cool very quickly on the typical dynamical timescale while the NIR-emitting electrons cool more slowly. This produces a spectral break in the model between NIR and X-ray wavelengths that can explain the differences in the observed spectral indices.
Original languageEnglish (US)
Title of host publicationThe Galactic Center
Subtitle of host publicationa Window to the Nuclear Environment of Disk Galaxies
EditorsMark R Morris, Q Daniel Wang, Feng Yuan
PublisherAstronomical Society of the Pacific
Number of pages4
ISBN (Electronic)978-1-58381-759-9
ISBN (Print)978-1-58381-758-2
StatePublished - 2011

Publication series

NameAstronomical Society of the Pacific Conference Series


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