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%astro-ph/0605253

\documentclass[12pt,preprint]{aastex}

\shorttitle{Imaging Spectroscopy of the SgrA* Region}
\shortauthors{Krabbe et al.}

\begin{document}

\title{Diffraction Limited Imaging Spectroscopy of the SgrA* Region
using OSIRIS, a new Keck Instrument}


\author{A. Krabbe, C. Iserlohe}
\affil{I. Physikalisches Institut, Universit\"at zu K\"oln,
50937    K\"oln, Germany}
\email{krabbe@ph1.uni-koeln.de}

\and

\author{J. E. Larkin, M. Barczys, M. McElwain, J. Weiss, S. A. Wright}
\affil{Division of Astronomy, University of California, Los Angeles,
CA, 90095-1562, USA}

\and

\author{A. Quirrenbach}
\affil{Leiden Observatory, P.O. Box 9513, NL-2300 RA Leiden, The 
Netherlands}

\begin{abstract}
We present diffraction limited spectroscopic observations of an
infrared flare associated with the radio source SgrA*.  These are the
first results obtained with OSIRIS, the new facility infrared imaging
spectrograph for the Keck Observatory operated with the laser guide
star adaptive optics system.  After subtracting the spectrum of
precursor emission at the location of Sgr A*, we find the flare has a
spectral index (F($\nu$) $\propto$ $\nu^{\alpha}$) of $\alpha
= -2.6 \pm 0.9$. If we do not subtract the precursor
light, then our spectral index is consistent with earlier observations
by Ghez et al. (2005).  All observations published so far suggest that
the spectral index is a function of the flare's K-band flux.

\end{abstract}

\keywords{Spectroscopy: infrared, imaging --- Telescopes: Keck ---
Instruments: OSIRIS --- individual(Galactic Center, SgrA*)}

\end{document}