Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384...72t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 384, Jan. 1, 1992, p. 72-80.
Astronomy and Astrophysics
Astrophysics
56
Carbon Monoxide, Cosmochemistry, Density Wave Model, Galactic Nuclei, Spiral Galaxies, Interstellar Matter, Star Formation
Scientific paper
High-resolution (5 arcsec, about 40 pc) maps of the (C-13)O emission in the nucleus of the nearby spiral galaxy IC 342 are presented. (C-13)O emission, a tracer of the H2 density distribution, indicates that the molecular gas in the nucleus takes the form of two spiral arms of total extent 500 pc. Molecular gas constitutes about 10 percent of the total dynamical mass within the inner half-kiloparsec, increasing to about 50 percent in the inner 100. The intense star formation traced by radio continuum and 10-micron emission is located within 40-50 pc of the dynamical center, where the two molecular ridges meet. From the offset of the H-alpha arms, the CO arms, and the strongly radial motions observed in the molecular gas, the gaseous structure in the nucleus of IC 342 is interpreted as the response to a spiral density wave. It is suggested that streaming motions and dissipative processes along the spiral arms channel the gas into the nucleus, leading to the development of the starburst.
Hurt Robert L.
Turner Jean L.
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