Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541414p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #414.14; Bulletin of the American Astronomical Society, Vol. 42, p.256
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present a preliminary investigation of the relation between star formation rates (SFRs) and integrated far-infrared continuum emission in a sample of 10 Galactic H II regions. The stellar initial mass function (IMF) of the ionizing clusters in each H II region has been measured directly down to solar or even subsolar masses via X-ray luminosity functions from high-resolution Chandra X-ray Observatory images and K-band luminosity functions of the X-ray selected source populations. Calibrations of SFRs against diffuse emission tracers of ionized gas are widely employed in extragalactic studies, where the stellar content can only be probed indirectly. Because OB stars dominate the ionization of H II regions but represent <1% of the cluster population, galactic SFR determinations generally rely upon both large extrapolations over an IMF and various assumptions concerning the physical properties of early-type stars.
MSP is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-0901646.
Broos Patrick S.
Feigelson Eric D.
Getman Konstantin V.
Povich Matthew S.
Townsley Leisa Kay
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