Physics
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phdt........19d&link_type=abstract
Thesis (PHD). UNIVERSITY OF HAWAII , Source DAI-B 59/04, p. 1694, Oct 1998, 148 pages.
Physics
4
Starburst
Scientific paper
New mid-infrared spectroscopy of 29 galaxies is presented. It is found that in most cases the far infrared emission from these galaxies is a result of massive star formation based in the presence of hydrocarbon emission features in the spectra, but in a few cases the power source of the far infrared radiation is likely to be due to an active galactic nucleus based on the absence of these features. By combining the present results with previously published results, two trends are discovered: (1) the presence of an energetically dominant but obscured active galactic nucleus may be more likely in the most powerful sources, and (2) the strength of the hydrocarbon emission features relative to continuum emission may be inversely proportional to the efficiency of massive star formation. More detail studies are also presented of (1) and off nuclear starburst in the interacting galaxy system Arp 299. (2) The spatially resolved starburst in the nearby galaxy NGC 253. An analogy with galactic protostar models is presented which may explain the presence of deep silicate absorption in the spectra of a few galaxies. This analogy implies that these galaxies are powered by a deeply imbedded active galactic nucleus.
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