Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phdt........37m&link_type=abstract
PhDT Thesis, University of Leeds (UK)
Other
3
Surveys, Infrared, Massive Star Formation
Scientific paper
As a part of the Red MSX Source (RMS) survey, the results of ground-based ~1" resolution mid-infrared (IR) imaging for 346 RMS candidates in the southern hemisphere are presented. Mid-IR emission was detected towards 303 sources, of which 82 showed multiple sources allowing the apportioning of larger beam fluxes using these data. These observations aided in the identification of all RMS sources observed, particularly of 80 radio quiet mid-IR point sources as YSOs and 62 extended sources as HII regions which were unresolved in larger beam observations.
Far infrared photometry is presented for 1113 of the 1336 young RMS sources, for which 744 had no previous far-IR detection, using satellite data and a new background subtraction method developed for the task. This new method uses a 2-D fit to the background near the source when performing background subtraction, instead of using a simple average, and so is much more realistic in cases where the background emission is bright and spatially variable on the scale of the observations in question. For 724 sources these data are from the Spitzer Space Telescope MIPSGAL survey which has a much higher spatial resolution (~18" at 70 microns) than previously available.
These data were then used, along with RMS survey kinematic distances and a publicly available grid of Monte-Carlo radiative transfer models of YSOs to obtain the luminosity of candidates identified as young sources. The various input parameters of the model fitter were tested in order to understand how each effects the resulting fits in the most comprehensive way to date. In addition, the luminosity results were compared with those determined using other methods. It was found that luminosities obtained using MIPSGAL photometry ans SED fits exhibit a reduction of ~40-50% over those determined using IRAS data and the Emerson luminosity. Previous luminosity determinations using this method are therefore likely to be overestimates, probably due to source confusion.
The luminosities obtained for RMS survey sources were then used to calculate the local luminosity function for MYSOs and HII regions within the Milky Way galaxy and estimate the lifetime of these phases as a function of luminosity for the first time. These results are consistent with the idea that there are few MYSOs with L >~10^5 Lsol, but that the formation of an HII region around YSOs with luminosities between 10^4 Lsol and 10^5 Lsol is inhibited or delayed by the swelling of the stellar radius due to high mass accretion rates.
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