Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309...70b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. 70-75. Research supported by Northeastern University.
Astronomy and Astrophysics
Astrophysics
34
Galactic Evolution, Infrared Spectroscopy, Infrared Stars, Interacting Galaxies, Interstellar Matter, Star Distribution, Stellar Evolution, B Stars, H Ii Regions, Interstellar Extinction, O Stars, Stellar Luminosity
Scientific paper
The authors report Brackett-α and Brackett-γ line observations of NGC 3690, NGC 5195, and IC 4553 (Arp 220). The infrared recombination transitions of ionized hydrogen provide a direct measure of the star formation activity and thus are important probes of the nature of the luminous infrared and radio emission in these sources. These galaxies are all bright infrared sources and members of interacting systems. Brackett lines were detected in NGC 3590 and its companion IC 694. The results suggest that the dust and ionized gas in the two components of this system represent very different physical conditions. Upper limits to the Brackett line emission in NGC 5195 and IC 4553 indicate that in these sources, the infrared continua are poorly correlated with the amount of observed ionized gas.
Beck Sara C.
Ho Paul T. P.
Turner Jean L.
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