Computer Science
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.178p&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Computer Science
Galaxies
Scientific paper
We present an overview of the Chandra ACIS Survey of M33 (ChASeM33): A Deep Survey of the Nearest Face-on Spiral Galaxy. The 1.4 Ms survey covers the galaxy out to a radius of approximately 18 arcmin (˜ 4kpc). These data provide the most complete, detailed look at a spiral galaxy in X-rays. The source catalog from this survey includes 668 sources to a limiting luminosity of ˜2.5 e34 ergs/s (0.35-8.0 keV). We discuss some of the analysis challenges posed by this survey and the techniques we have adopted to address these challenges. In an attempt to classify these sources, we have constructed hardness ratios for all the sources and have fit the spectra of sources with more than 100 counts. We have used these spectral results to identify sources with hard spectra typical of X-ray binaries (XRBs) or active galactic nuclei (AGNs) and soft spectra typical of foreground stars or supernova remnants (SNRs). Based on these X-ray spectra, we have identified two ``ejecta-dominated'' SNRs in M33 and, by including the variability data, two new eclipsing XRBs. We will also present examples of cross-correlations of the X-ray sources with previous X-ray catalogs. A spectroscopic follow-up study of the X-ray sources with optical counterparts is currently being carried out at the MMT Observatory, with spectra of 77 of the brightest counterparts acquired. We will present detailed spectral fits to some of the brightest sources. Finally, we will present a luminosity function of the point sources in this catalog. This work was supported by NASA grant NAS G06-7073A and NASA contract NAS8-03060.
Blair William Patrick
Challis Peter
ChASeM33 Team
Edgar Richard J.
Gaetz Terrance J.
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