Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..349l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Sept. 15, 1989, p. 349-372. Research supported by
Astronomy and Astrophysics
Astronomy
76
Active Galaxies, Astronomical Spectroscopy, Luminosity, Star Formation Rate, Starburst Galaxies, Visible Spectrum, Emission Spectra, H Ii Regions, Infrared Astronomy Satellite, Infrared Sources (Astronomy), Interacting Galaxies
Scientific paper
Moderate-resolution spectrophotometry was used to obtain various emission-line ratios and emission-line luminosities for a complete sample of predominantly high-luminosity IRAS galaxies. Most of the objects exhibit H II region-like spectra, while about 12 percent are Seyferts or LINERs. The results show the IRAS galaxies to be of lower ionization than an optically selected sample of H II region-like galaxies, possibly due to either high metallicities or to their high dust content. Although the estimated number of O stars present is consistent with the observed emission-line flux, the IR to emission-line luminosity ratio of all the IRAS galaxies is very high. The present observations can be reconciled using a model with two types of regions, type I clouds (with extinctions of about 20) representing very recent star formation, and type II clouds (with extinctions of about 1) representing older starburst and/or general disk star formation.
Crawford J. J.
Lawrence Andy
Leech Kieron J.
Penston Michael V.
Rowan-Robinson Michael
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