------------------------------------------------------------------------
 ramirez.tex ApJS, 2008, in press
Message-ID: <Pine.GSO.4.58.0709210947540.10204@keenan.ipac.caltech.edu>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-CanItPRO-Stream: 02_Outbound_Opt_Out
X-Spam-Score: undef - spam-scanning disabled
X-Scanned-By: CanIt (www . roaringpenguin . com) on 134.4.10.130
X-MailScanner-Information: Please contact the postmaster@aoc.nrao.edu for more information
X-MailScanner: Found to be clean
X-MailScanner-SpamCheck: not spam, SpamAssassin (not cached, score=0,
	required 5, autolearn=disabled)
X-MailScanner-From: solange@ipac.caltech.edu
X-Spam-Status: No

%astro-ph/0709.3113

\documentclass[12pt,preprint]{aastex}

\newcommand{\degree}{$^{\circ}$}
\newcommand{\msol}{\hbox{$M_\odot$}}

\slugcomment{ApJS, in press}

\shorttitle{Point Sources GC Spitzer Survey}
\shortauthors{Ram\'{\i}rez et al.}

\begin{document}

\title{Point Sources from a {\it Spitzer} IRAC Survey of the Galactic Center}

\author{Solange V. Ram\'{\i}rez}
\affil{IPAC/Caltech, Pasadena, CA 91125}
\email{solange@ipac.caltech.edu}

\author{Richard G. Arendt}
\affil{CRESST/UMBC/GSFC, Code 665, Greenbelt, MD 20771}

\author{Kris Sellgren}
\affil{The Ohio State University, Columbus, OH 43210}

\author{Susan R. Stolovy}
\affil{{\it Spitzer} Science Center, Caltech, Pasadena, CA 91125}

\author{Angela Cotera}
\affil{SETI Institute, Mountain View, CA 94043}

\author{Howard A. Smith}
\affil{Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138}

\author{Farhad Yusef-Zadeh}
\affil{Northwestern University, Evanston, IL 60208}


%%ABSTRACT
\begin{abstract}
We have obtained $Spitzer$/IRAC observations of the central
2.0\degree $\times$ 1.4\degree ($\sim$ 280 $\times$ 200 pc)
of the Galaxy at 3.6\micron--8.0\micron.
A point source catalog of 1,065,565 objects is presented.
The catalog includes magnitudes for the point sources
at 3.6, 4.5, 5.8, and 8.0\micron , as well as $JHK_s$
photometry from 2MASS.
The point source catalog is confusion limited with
average limits of 12.4, 12.1, 11.7, and 11.2 magnitudes
for [3.6], [4.5], [5.8], and [8.0], respectively.
We find that the confusion limits are spatially variable
because of stellar surface density, background surface brightness
level, and extinction variations across the survey region.
The overall distribution of point source density with Galactic
latitude and longitude is essentially constant, but structure
does appear when sources of different magnitude ranges
are selected.
Bright stars show a steep decreasing gradient with Galactic
latitude, and a slow decreasing gradient with Galactic
longitude, with a peak at the position of the Galactic center.
From IRAC color-magnitude and color-color diagrams,
we conclude that most of the point sources in our
catalog have IRAC magnitudes and colors characteristic
of red giant and AGB stars.
\end{abstract}

\keywords{Galaxy: center --- stars: late-type}

#########################################################################

Solange V. Ramirez, Ph.D.                        solange@ipac.caltech.edu
NStED Catalog Astronomer                                     626-395-1929
IPAC                                                            MS 100-22
Caltech                                                Pasadena, CA 91125