An X-ray, IR, and Submillimeter Flare of Sagittarius A*

Details An X-ray, IR, and Submillimeter Flare of Sagittarius A* An X-ray, IR, and Submillimeter Flare of Sagittarius A*

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20911206m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #112.06; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Energetic flares are observed in Sgr A* from radio to X-ray wavelengths. The rapid modulation timescales of these flares, particularly in the IR and X-ray bands, suggest that the emission originates from close to the black hole, so a complete understanding of these outbursts should reveal the conditions in the inner accretion regions. In recent years multi-wavelength observing campaigns have detected simultaneous flares in the IR and X-ray, but these data leave great freedom in interpretation with physical models. Here we present a flare observed over several hours on July 17, 2006 with the Chandra X-ray Observatory, the Keck II telescope, the Caltech Submillimeter Observatory, and the Submillimeter Array. This is the first flare to be captured in the submillimeter, IR, and X-ray, a wavelength range that contains the bulk of the emitted energy. We measured the evolution of the flare intensity and spectral index in each band; the flare duration ranged from an hour in the X-ray to several hours in the submillimeter and there is a significant temporal offset between the onset of the submillimeter and X-ray flares. The addition of the spectral index measurements and the submillimeter data provide stronger constraints on the flaring mechanism than were possible in previous flares, and we discuss the insights derived from these data.

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