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Volume 331 - Frontier Research in Astrophysics – III (FRAPWS2018) - High Energy Astrophsyics
A Faint Near-Infrared/Radio Flare form SgrA
A. Eckart,* L. Steiniger,, B. Shahzamanian,, K. Markakis,, A. Eckart,, S. Nishiyama,, M. Zajacek,, M. Parsa1,, E. Hosseini,, N. Fazeli,, G. Busch,, M. Subroweit,, F. Peissker,, N. Sabha,, M. Valencia-S.,, C. Straubmeier,, A. Borkar,, V. Karas,, S. Britzen,, A. Zensus
*corresponding author
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Pre-published on: 2018 October 04
Published on:
Abstract
During the past decades the analysis of flare emission from Sgr A* helped to put constraints on the emission models and the corresponding physical parameters. In the NIR the source is characterized by a single power-law flux density distribution. There is also evidence for the fact that radio and NIR variability data are described by a single power-law state with a power-law index of 4 similar to the one in the NIR. Here we summarize results of an analysis of NIR Ks-band data taken in the NIR using the High-contrast Coronographic Imager for Adaptive Optics (HiCIAO) at the SUBARU Telescope in May 2012. These observations partially overlap in time
with radio data taken with the Australia Telescope Compact Array (ATCA) interferometer. The results are discussed in the framework of adiabatically expanding synchrotron sources as well as the possibility of quasi-simultaneous flare emission at both frequencies. The analysis has also been applied to other NIR/radio flares. The magnetic fields that we derive are in the range of a few to about 30 Gauss.
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