Highlights of the 2008 Observing Campaign of Sgr A*
Abstract
We have carried out multi-wavelength observations of Sgr A* in May and July of 2008 using the Chandra X-ray Observatory, APEX, ATCA, CARMA, CSO, IRAM, NMA, SMA, SMT, VLA, VLBA and VLT. Previous measurements have shown time delayed emission between near-IR and radio/submm. Here, we present two new aspects of the variability of Sgr A* across the electromagnetic spectrum. One is evidence for dimming of submm and radio flux during the peak of near-IR flare emission. This is consistent with recent finding that the variability of Sgr A* in radio and submm wavelengths is anti-correlated with near-IR flare emission. This newly recognized behavior is consistent with adiabatically cooling plasma blobs that are expanding but also partially eclipsing the background quiescent emission from Sgr A*. The second
result is that cross correlation of X-rays and near-IR light curves suggests that X-ray flare emission lags behind near-IR flare emission by several minutes. This implies that X-ray emission is due to inverse Compton scattering of near-IR flare emission by submm emitting electrons.- Publication:
-
American Astronomical Society Meeting Abstracts #217
- Pub Date:
- January 2011
- Bibcode:
- 2011AAS...21732306Y