Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21822813p&link_type=abstract
American Astronomical Society, AAS Meeting #218, #228.13; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We present the final point source catalog of the Chandra ACIS Survey of M33 (ChASeM33). With a total exposure time of 1.4 Ms, ChASeM33 covers 70% of the D25 isophote (R 4.0 kpc) of M33 and provides the deepest, most complete, and detailed look at a spiral galaxy in X-rays. The source catalog includes 662 sources ( half in M33), reaches a limiting unabsorbed luminosity of 2.4e34 erg/s in the 0.35-8.0 keV band (assuming an NH of 1e21 cm^-2), and contains source positions, source net counts, fluxes and significances in several energy bands, and information on source variability. The source catalog and additional information are available at: "http://hea-www.harvard.edu/vlp_m33_public/chasem33_fincat.html". To constrain the nature of the detected X-ray source, hardness ratios were constructed and spectra were fit for 254 sources, followup MMT spectra of 116 sources were acquired, and cross-correlations with previous X-ray catalogs and other multi-wavelength data were generated. Based on this effort, 183 of the 662 ChASeM33 sources could be identified. Finally, the luminosity function for the detected point sources as well as for the X-ray binaries in M33 is presented. The luminosity functions in the soft band (0.5-2.0 keV) and the hard band (2.0-8.0 keV) have a limiting luminosity at the 90% completeness limit of 4.0e34 erg/s and 1.6e35 erg/s (for D=817 kpc), respectively, which is significantly lower than previous X-ray binary population studies in galaxies more distant than M33. The resulting distribution is consistent with a dominant population of high mass X-ray binaries as would be expected for M33.
This work was supported by NASA grant NAS G06-7073A and NASA contract NAS8-03060.
ChASeM33 Team
Gaetz Terrance J.
Kuntz Kip D.
Long Knox S.
Plucinsky Paul P.
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