Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199p..31a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 199, May 1982, p. 31P-35P.
Astronomy and Astrophysics
Astronomy
41
Galactic Nuclei, H Ii Regions, Infrared Astronomy, Interstellar Gas, Cosmic Dust, Hydrogen Ions, Ionized Gases, Light (Visible Radiation), Neon, Silicates, Spectrophotometry, Sulfur
Scientific paper
Spectrophotometry from 8-13 microns of the strong infrared source in the nucleus of NGC 5253 indicates the presence of an obscured region of very high ionization. The shape of the dust continuum suffering from silicate absorption and the strength of the forbidden lines S IV fine structure line require either a compact cluster of several hundred early O stars or a single massive highly luminous object within 50 pc of the nucleus obscured in the visible, to provide both the infrared luminosity and ionizing flux. It appears that the infrared emission has been produced by a recent burst of star formation, probably with a bias towards more massive stars, and the 8-13 micron spectrum shows no evidence for the narrow emission features of 11.25 and 8.65 microns, or the forbidden lines Ne II line at 12.8 microns.
Aitken David K.
Allen Charlotte M.
Phillips Marcia
Roche Patrick F.
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