Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..281m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 2, June 1984, p. 281-288.
Astronomy and Astrophysics
Astronomy
53
Galactic Radiation, Infrared Astronomy, Interstellar Masers, Spiral Galaxies, Water Masers, Continuous Spectra, Emission Spectra, Galactic Nuclei, Luminosity
Scientific paper
IR data on the galaxies Circinus and NGC 4945 are reviewed to examine their status in the light of current star formation models. Corrections are performed for interstellar and internal reddening to obtain the U-B, B-V, H-K and J-K color indices. Attention is also given to the Brackett gamma line, the 3.28 and 9.7 emissions, the 1.2-20 micron continuum and the galactic luminosities. The data indicate that no changes have occurred because of star formation in the last 100 Myr. A large difference was found in the ratios of IR/H2O maser emissions from both galaxies. The presence of a 200 pc diameter nonstellar emission, strong 9.7 micron absorption and strong 3.28 and 9.7 emissions for NGC 4945 indicate that a supermassive object is in formation.
Glass S000. I.
Moorwood Alan F. M.
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