Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45..529s&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 4, p. 529-538
Astronomy and Astrophysics
Astronomy
20
Absorption Spectra, Abundance, Carbon Monoxide, Cosmic Dust, Elliptical Galaxies, Mass Ratios, Interstellar Matter, Late Stars, Molecular Clouds, Spiral Galaxies, Stellar Envelopes, Universe
Scientific paper
By carrying out a deep survey of (12) CO (J = 1-0) line emission toward elliptical galaxies, we co-added two CO detected ellipticals, NGC 4589 and NGC 4697. These two ellipticals are FIR galaxies, and NGC 4589 has a dust lane across the major axis. Adding data from the literature, we found that the CO-to-dust abundance ratio in elliptical galaxies is approximately the same as that for spirals and for local molecular clouds. We conclude that the CO-to-dust ratio, which is an indicator of the mutual abundance ratios among heavy elements, is universal in interstellar matter in ellipticals, spirals, and in local molecular clouds. This is explained if the ratio is kept constant (frozen), since interstellar heavy elements and dust, which are supplied from late-type stars and their circumstellar shells, have left their parent stars.
Sofue Yoshiaki
Wakamatsu Ken'ichi
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