Simultaneous Observations of Sgr A* Flares in the X-ray, NIR, and Submm

Details Simultaneous Observations of Sgr A* Flares in the X-ray, NIR, and Submm Simultaneous Observations of Sgr A* Flares in the X-ray, NIR, and Submm

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.8801b&link_type=abstract

American Astronomical Society, AAS Meeting #212, #88.01; Bulletin of the American Astronomical Society, Vol. 40, p.267

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Scientific paper

We present results from two multiwavelength monitoring campaigns that were performed on Sgr A* using Chandra, Keck II, SMA, and CSO. These campaigns have, for the first time, successfully observed two flares simultaneously in the X-ray, NIR, and submillimeter. One flare was observed on 2005 July 31 (UT); the other was observed on 2006 July 17 (UT). Observations with the Keck II AO system at K' and L' showed that both flares appeared to be of similar amplitudes and spectral indices as previously observed NIR flares, although the Keck observations missed the peak of the 2006 flare by about 30 minutes.
The submillimeter flares were likewise of similar amplitudes, about 1 Jy. However, the submillimeter peak of the 2006 flare lagged the shorter wavelengths by nearly 100 minutes, while the lag of the submillimeter peak in 2005 apears to have been about 80 minutes shorter. Remarkably, the 2006 flare shows a strong X-ray flare, while the 2005 flare has no detectable X-ray emission above the constant level produced by diffuse gas in the central parsec. Thus, the two flares have remarkably different X-ray to NIR flux ratios and submillimeter lags. We have found a possible correlation between the X-ray to NIR flux ratio and the time lag of the submm peak in the two flares that can be explained with an adiabatically expanding relativistic plasma model.

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