Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...398l..25d&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 398, no. 1, p. L25-L27.
Astronomy and Astrophysics
Astronomy
65
Cosmic Dust, Infrared Sources (Astronomy), Starburst Galaxies, Submillimeter Waves, Abundance, Astronomical Models, Carbon Monoxide, Interstellar Extinction, Metallicity
Scientific paper
We measured with the IRAM 30 m telescope the continuum flux of the extremely luminous primeval galaxy IRAS 10214 +4724 at a wavelength of 1.2 mm. This is the longest wavelength at which this galaxy's thermal continuum radiation has been detected; at z = 2.286, it corresponds to a rest wavelength of 370 microns. From the entire continuum spectrum we estimate a dust temperature of 80 K, and from the optically thin radiation at 370 microns (rest frame) we find a dust mass of 2.5 x 10 exp 8/sq h solar masses. For the H2 mass of 1 x 10 exp 11/sq h solar masses implied by the CO line luminosity, this yields a ratio of the mass of gas (H2 + He) to warm dust of 500, which is surprisingly normal for a galaxy at z = 2.3. It is the same value as observed in the central regions of nearby luminous galaxies that have solar metallicity. The ratio of observed CO and 370 microns (rest-frame) luminosities in 10214 + 4724, essentially the gas-to-dust mass ratio, is the same as in nearby galaxies. Hence, in this galaxy, most of the heavy elements have already been produced, at nearly present-day abundances.
Downes Dennis
Greve Albert
Radford J. E.
Solomon Philip M.
Thum Clemens
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