Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21711502y&link_type=abstract
American Astronomical Society, AAS Meeting #217, #115.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The goal of this study is to investigate the cycle of the star formation focusing on the young massive star-forming regions and their interaction with their surroundings on the local scales in galaxies in the M81 group. The X-ray data are analyzed to understand the hot phase of the interstellar medium as characterized by the X-ray properties of the hot gas, separately treating supernovae remnants, Hii regions, and diffuse residual emission. The observed hot gas temperature of the events related to star-forming activities do not change dramatically over the recent star-formation time scale, about 100 Myr, but the density of the hot gas and hence pressure may decrease over time. The physical properties of the star-forming events on local scales are derived by comparing the broadband spectra using GALEX and Spitzer data to the stellar population synthesis models convolved with the dust reprocessing model. The mechanical luminosity from stars via stellar winds and supernovae is estimated based on the derived physical properties and compared to the X-ray luminosity of star-forming regions to estimate the amount of radiative losses of the hot gas. A very low ratio of the X-ray luminosity to mechanical luminosity suggests that most of the released energy goes into thermalization and is only slowly radiated over a very long period of time.
Swartz Doug
Yukita Mihoko
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