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F. Yusef-Zadeh (Northwestern U.), H. Bushouse (STScI), C.D. Dowell (JPL), M. Wardle (Macquarie U.), D. Roberts (Adler P. / Northwestern U.), C. Heinke (Northwestern U.), G. C. Bower (UC Berkeley), B. Vila Vilaro (NOJ), S. Shapiro (UIUC), A. Goldwurm, G. Belanger (CEA-Saclay)
I review highlights of the results of two observing campaigns in 2004, designed to investigate the correlation of flare activity from Sgr A* between radio wavelengths and soft gamma-ray energies. We report the detection of a simultaneous X-ray and near-IR flare, as well as a sub-millimeter and near-IR flare using the NICMOS of HST, XMM-Newton and CSO. We explain the X-ray emission as arising from the population of near-IR-synchrotron-emitting relativistic particles, scattering sub-millimeter seed photons within the inner 10 RSch radius of Sgr A* up to X-rays and soft gamma-rays, detected by INTEGRAL. Using the inverse Compton scattering picture, we explain the lack of one-to-one X-ray counterparts to near-IR flares by the variation of the magnetic field and the spectral index distributions of the nonthermal particles. Lastly, we present a composite spectrum of Sgr A* based on these observing campaigns.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.