Coordinated Observations of SgrA*

Details Coordinated Observations of SgrA* Coordinated Observations of SgrA*

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1404e&link_type=abstract

ATNF proposal C1825, Semester: April, 2008

Physics

Galactic, Atca

Scientific paper

In 2003-2007 radio to X-ray multi-wavelength observations and IR polarization experiments have provided essential new insights into accretion/emission mechanisms related to Sgr A*, the super-massive black hole at the center of the Milky Way. Emission from highly polarized flares was found in the near-infrared that show a 17-20 min quasi-periodicity. The data are consistent with partially polarized non-thermal emission from confined hot spots in relativistic orbits around Sgr A*. The May 2007 VLT/ATCA/CARMA NIR polarization and mm-measuremenzts have provided clear evidence for adiabatic expansion of plasma. Variability on time scales of a few hours has been observed in the mm-regime. We propose for ATCA observations of Sgr A* embedded in a new coordinated mm/NIR/X-ray campaign on Sgr A*. The mm-data are essential to link the flares to possible outflow phenomena and to probe variability of the 3mm photosphere.

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