Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21732306y&link_type=abstract
American Astronomical Society, AAS Meeting #217, #323.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Brunthaler Andreas
Bushouse Howard
Dodds-Eden Katie
Dowell Darren
Edwards Philip
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