Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...313..644t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 313, Feb. 15, 1987, p. 644, 645, 647-650. Research supported by Northeaster
Astronomy and Astrophysics
Astronomy
32
Astronomical Spectroscopy, Galactic Nuclei, Infrared Spectroscopy, Spiral Galaxies, Star Formation, B Stars, H Ii Regions, Hydrogen Ions, Infrared Astronomy, Nebulae, O Stars, Starburst Galaxies
Scientific paper
The Br-alpha (4.05 micron) and Br-gamma (2.17 micron) recombination lines of ionized hydrogen have been observed in five positions in the nucleus of M83 and detected in two. The results show that young OB stars are the major source of energy in the nucleus and that the extinction toward the young stellar region is high and spatially patchy. The Brackett lines are anomalously strong relative to the thermal radio flux. Possible explanations for this unexpected results are very low electron temperatures or a population of compact H II regions in the nucleus. In the latter case, it is suggested that the starburst must be extremely short-lived (10,000 yr) and not likely to be sustained.
Beck Sara
Ho Paul T. P.
Turner Jean L.
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