Probing ionizing stars of ultracompact H II regions with mid-infrared fine structure lines

Details Probing ionizing stars of ultracompact H II regions with mid-infrared fine structure lines Probing ionizing stars of ultracompact H II regions with mid-infrared fine structure lines

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002asthe..95..134o&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 95, No. 3, p. 134 - 143 (2002)

Astronomy and Astrophysics

Astronomy

H Ii Regions, Infrared Lines

Scientific paper

We observed two ultracompact (UC) H II regions W51IRS2 and K3-50A with imaging and long-slit spectroscopy in the N-band. Using fine structure line emissions of [Ne II] 12.8 μm, [Ar III] 8.99 μm, and [S IV] 10.51 μm, we probed the ionizing stars of the regions. For all of the UC H II regions observed, flux ratios of the lines suggest much later spectral types than those derived from the radio continuum fluxes. Toward K3-50A, the extinction-corrected [Ne II] emission was clearly resolved into two peaks, suggesting the presence of at least two ionizing sources. (Ultra) compact H II regions are likely to be ionized by star clusters.

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