Chandra ACIS Survey of X-ray Point Sources: The Source Catalog
  The $Chandra$ archival data is a valuable resource for various studies on
different topics of X-ray astronomy. In this paper, we utilize this wealth and
present a uniformly processed data set, which can be used to address a wide
range of scientific questions. The data analysis procedures are applied to
10,029 ACIS observations, which produces 363,530 source detections, belonging
to 217,828 distinct X-ray sources. This number is twice the size of the
$Chandra$ Source Catalog (Version 1.1). The catalogs in this paper provide
abundant estimates of the detected X-ray source properties, including source
positions, counts, colors, fluxes, luminosities, variability statistics, etc.
Cross-correlation of these objects with galaxies shows 17,828 sources are
located within the $D_{25}$ isophotes of 1110 galaxies, and 7504 sources are
located between the $D_{25}$ and 2$D_{25}$ isophotes of 910 galaxies.
Contamination analysis with the log$N$--log$S$ relation indicates that 51.3\%
of objects within 2$D_{25}$ isophotes are truly relevant to galaxies, and the
"net" source fraction increases to 58.9\%, 67.3\%, and 69.1\% for sources with
luminosities above $10^{37}$, $10^{38}$, and $10^{39}$ erg s$^{-1}$. Among the
possible scientific uses of this catalog, we discuss the possibility to study
intra-observation variability, inter-observation variability, and supersoft
sources.
