Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..645t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 15, 1987, p. 645-653.
Astronomy and Astrophysics
Astrophysics
28
Astronomical Spectroscopy, Continuous Spectra, Emission Spectra, Galactic Nuclei, Millimeter Waves, Star Formation, Carbon Monoxide, Cosmic Dust, Hydrogen, Line Spectra, Milky Way Galaxy, Signal To Noise Ratios
Scientific paper
The authors have searched for 1.3 mm continuum emission toward the centers of eight galaxies and detected it with a signal-to-noise ratio greater than 3 in three: NGC 1068, Arp 220, and M82. M51 and NGC 253 were possibly detected, and negative results were obtained for IC 342, NGC 6574, and NGC 4038. The authors concluded that the emission at this wavelength is from dust at modest temperatures (Td ≈ 20K). Gas masses calculated from the 1.3 mm emission are in fair agreement with the estimated amount of H2. It is shown that gas masses estimated from millimeter continuum observations are accurate to about a factor of 5. The authors use the gas masses and the observed far-infrared luminosity to estimate the efficiency of star formation. For most galaxies, this efficiency is approximately equal to 1%.
Maloney Philip
Thronson Harley A. Jr.
Walker Christopher K.
Walker Constance E.
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