Journal
ASTROPHYSICAL JOURNAL
Volume 642, Issue 2, Pages L145-L148Publisher
IOP PUBLISHING LTD
DOI: 10.1086/504587
Keywords
galaxy : center; instrumentation : spectrographs; techniques : high angular resolution
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We present diffraction-limited spectroscopic observations of an infrared flare associated with the radio source Sgr A*. These are the first results obtained with OSIRIS, the new facility infrared imaging spectrograph for the Keck Observatory operated with the laser guide star (LGS) adaptive optics (AO) system. After subtracting the spectrum of precursor emission at the location of Sgr A*, we find that the flare has a spectral index [F(nu) proportional to nu(alpha)] alpha = -2.6 +/- 0.9. If we do not subtract the precursor light, then our spectral index is consistent with earlier observations by Ghez et al. All observations published so far suggest that the spectral index is a function of the flare's K-band flux.
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