Far-infrared lines from G45.13 + 0.14 A and K3-50 A - Density fluctuations in compact H II regions

Details Far-infrared lines from G45.13 + 0.14 A and K3-50 A - Density fluctuations in compact H II regions Far-infrared lines from G45.13 + 0.14 A and K3-50 A - Density fluctuations in compact H II regions

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366..172c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 366, Jan. 1, 1991, p. 172-180.

Astronomy and Astrophysics

Astrophysics

21

Density Distribution, Far Infrared Radiation, H Ii Regions, Infrared Spectra, Abundance, Astronomical Observatories, Electron Density (Concentration), Very Large Array (Vla)

Scientific paper

Properties of two compact H II regions, K3-50 A and G45.13 + 0.14 A, were investigated by measuring FIR fluxes from forbidden O III 51.8 and 88.4 micron lines, forbidden N III 57.3 micron line, forbidden S III 33.5 micron line, and forbidden Ne III 36.0 micron line of these regions, using a cooled grating spectrometer on NASA's Kuiper Airborne Observatory. For both H II regions, the ratio of the two FIR O(2+) lines indicates an electron density of about 1000/cu cm, which for K3-50 A is a factor of 10 to 100 lower than the density determined from optical line observations of the lower excitation species S(+) and N(+) and than the peak rms density deduced from radio continuum measurements by Turner and Matthews (1984). Detailed spherically symmetric models of the two sources were constructed using all available measurements.

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