Star formation in the Magellanic Clouds. III - IR observations of giant H II regions

Details Star formation in the Magellanic Clouds. III - IR observations of giant H II regions Star formation in the Magellanic Clouds. III - IR observations of giant H II regions

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..603j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, April 1, 1986, p. 603-627.

Astronomy and Astrophysics

Astronomy

49

Astronomical Maps, H Ii Regions, Infrared Astronomy, Magellanic Clouds, Star Formation, Emission Spectra, Far Infrared Radiation, H Alpha Line, Near Infrared Radiation, O Stars, Point Sources, Protostars, Stellar Luminosity, Stellar Mass

Scientific paper

The results of far-infrared and near-infrared mapping of several H II regions in the LMC and SMC are presented together with the results of a continuing search for protostars using NIR techniques. The FIR map of N 159 shows strong 100 and 50 microns emission over the entire 2 x 4 arcmin area seen in H-alpha, with two major peaks closely coinciding with the 843 MHz radio map. A second new IR point source showing no evidence of ionizing radiation (protostar) has been found in N 159. Each protostar lies about 30 off-center on the steep gradient of each FIR peak. N 160 A is nearly as luminous as N 159, but is far more compact. All four LMC H II regions studied in the FIR (N 159, N 160 A, N 59 A, N 158) produce more ionizing radiation than expected for their luminosity. This result is most simply explained by a preponderance of early O stars over lower mass stars in comparison with galactic H II regions or a normal IMF, although density and geometric factors can not be ruled out. The LMC H II regions do not have the high surface brightness cores seen in galactic H II regions such as W49, but on the other hand are more compact than very diffuse galactic H II regions such as DR23.

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