Helium and hydrogen excitation in starburst galaxies - infrared and optical line ratios

Details Helium and hydrogen excitation in starburst galaxies - infrared and optical line ratios Helium and hydrogen excitation in starburst galaxies - infrared and optical line ratios

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277..577d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 2, pp. 577-593.

Astronomy and Astrophysics

Astronomy

33

Galaxies: Starburst, Infrared: Galaxies

Scientific paper

We present infrared spectra for a heterogeneous sample of 22 starburst galaxies. Line fluxes are measured for the prominent HeI 2.058-μm and Brgamma lines, and their ratio is compared with theoretical predictions of the behaviour of the HeI 2.058 mum/Brgamma line ratio with stellar effective temperature. The observed line ratios are lower than those found in individual compact HII regions. For a subset of these galaxies optical measurements of HeI/Hβ were derived from the literature. The combination of optical and infrared HeI/HI line ratios suggests effective temperatures for the UV field of at least 40000K, consistent with existing results from metal-line excitation.

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