Deep Subaru Halpha Observations of M83 XUV Disk

Details Deep Subaru Halpha Observations of M83 XUV Disk Deep Subaru Halpha Observations of M83 XUV Disk

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915103k&link_type=abstract

American Astronomical Society, AAS Meeting #219, #151.03

Astronomy and Astrophysics

Astronomy

Scientific paper

We report Subaru deep Halpha observations of the extended ultraviolet (XUV) disk of M83. Combining Subaru and GALEX data with a stellar population synthesis model, we find that (1) the stochastic stellar initial mass function (IMF) is preferred rather than the truncated IMF, because some low mass stellar clusters (10^2-3Msun) have massive O-type stars; and that (2) the standard Salpeter IMF and a simple aging effect explain the counts of FUV-bright and Halpha-bright clusters. The new data, model, and previous spectroscopic studies provide overall consistent results with respect to the internal dust extinction (AV 0.1 mag) and low metallicity ( 0.2Z&sun;). After the extinction correction and background subtraction, virtually all clusters in the XUV disk are blue FUV-NUV <0.0 mag.

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