Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-11-08
The Astrophysical Journal, 726, 54, 2011
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
11 pages, 8 figures, 1 table. The title is slightly changed and references are updated. Minor corrections are also included
Scientific paper
Sagittarius A$^*$ in the Galactic center harbors a supermassive black hole and exhibits various active phenomena. Besides quiescent emission in radio and submillimeter radiation, flares in the near infrared (NIR) and X-ray bands are observed to occur frequently. We study a time-dependent model of the flares, assuming that the emission is from a blob ejected from the central object. Electrons obeying a power law with the exponential cutoff are assumed to be injected in the blob for a limited time interval. The flare data of 2007 April 4 were used to determine the values of model parameters. The spectral energy distribution of flare emission is explained by nonthermal synchrotron radiation in the NIR and X-ray bands. The model light curves suggest that electron acceleration is still underway during the rising phase of the flares. GeV gamma-rays are also emitted by synchrotron self-Compton scattering, although its luminosity is not strictly constrained by the current model. If the GeV emission is faint, the plasma blob is dominated by the magnetic energy density over the electron kinetic energy density. Observations in the GeV band will clarify the origin of the blob.
Kusunose Masaaki
Takahara Fumio
No associations
LandOfFree
Synchrotron Blob Model of Infrared and X-ray Flares from Sagittarius A$^*$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Synchrotron Blob Model of Infrared and X-ray Flares from Sagittarius A$^*$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synchrotron Blob Model of Infrared and X-ray Flares from Sagittarius A$^*$ will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-130738