Coordinated multi-wavelength observations of Sgr A*

Details Coordinated multi-wavelength observations of Sgr A* Coordinated multi-wavelength observations of Sgr A*

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007atnf.prop..761s&link_type=abstract

ATNF proposal C1660, Semester: April, 2007

Physics

Galactic, Atca

Scientific paper

In 2003-2006 pioneering 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*. Polarization measurements at mm-wavelengths have recently provided evidence for orbital motion of plasma, too. There is evidence that the flares are linked to adiabatically expanding 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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