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From: Jessica Lu  jlu@astro.UCLA.EDU 
To: gcnews@aoc.nrao.edu



\begin{document}

\title{IRS 16SW - A New Comoving Group of Young Stars
in the Central Parsec of the Milky Way}

\author{
J. R. Lu,
A. M. Ghez\altaffilmark{1},
90095-1562}
\email{jlu, ghez, seth, morris, becklin@astro.ucla.edu}
\altaffiltext{1}{UCLA Institute of Geophysics and Planetary Physics,
Los Angeles, CA 90095-1565}


\begin{abstract}
One of the most perplexing problems associated with the supermassive black
hole at the center of our Galaxy is the origin of the young stars in its
close vicinity. Using proper motion measurements and stellar number
density counts based on 9 years of diffraction-limited K(2.2 \micron)-band
speckle imaging at the W. M. Keck 10-meter telescopes, we have identified
a new comoving group of stars, which we call the IRS 16SW comoving group,
located 1\farcs9 (0.08 pc, in projection) from the central black hole.
Four of the five members of this comoving group have been
spectroscopically identified as massive young stars, specifically He I
emission-line stars and OBN stars. This is the second young comoving
group within the central parsec of the Milky Way to be recognized and is
the closest, by a factor of 2, in projection to the central black hole.
These comoving groups may be the surviving cores of massive infalling star
clusters that are undergoing disruption in the strong tidal field of the
central supermassive black hole.
\end{abstract}


\end{document}

----------------------------------
Jessica Lu
Graduate Student
UCLA Astronomy and Astrophysics
jlu@astro.ucla.edu
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