Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.290..473b&link_type=abstract
In ESA, Infrared Spectroscopy in Astronomy p 473-475 (SEE N90-19084 11-89)
Astronomy and Astrophysics
Astronomy
Hydrogen, Infrared Spectroscopy, Star Distribution, Star Formation, Starburst Galaxies, Infrared Spectra, Line Spectra, Spectral Resolution, Spectrum Analysis
Scientific paper
The measurements of Brackett alpha and gamma, with a 7.2 arc seconds beam and 350 km/s spectral resolution in 11 infrared bright galaxies, are presented. The fluxes are used as diagnostics of the population of young OB stars. It is observed that: in some galaxies the ratios of Brackett to radio continuum flux are unusual and could indicate the presence of ultra compact HII regions, very low electron temperatures, or widespread departures from Case B recombination; in all galaxies the 10 microns continuum flux exceeds that which can be produced by the Lyman heating of dust. The results lead to the following conclusions: conditions in star formation sources can be quite extreme; Brackett lines are flexible and powerful probes of conditions in external galaxies.
Beck Sara C.
Ho Pak Tung
Turner Jean L.
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