Molecular Gas Properties of the Starburst Nucleus of IC 342: High-Resolution 13CO (2-1) Imaging

Details Molecular Gas Properties of the Starburst Nucleus of IC 342: High-Resolution 13CO (2-1) Imaging Molecular Gas Properties of the Starburst Nucleus of IC 342: High-Resolution 13CO (2-1) Imaging

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...531..200m&link_type=abstract

The Astrophysical Journal, Volume 531, Issue 1, pp. 200-209.

Astronomy and Astrophysics

Astronomy

33

Galaxies: Individual: Alphanumeric: Ic 342, Galaxies: Ism, Galaxies: Nuclei, Galaxies: Starburst, Radio Lines: Galaxies

Scientific paper

We present a map of the J=2-1 transition of 13CO in the starburst nucleus of IC 342 made with the Owens Valley Millimeter Array. The interferometric 13CO map allows us to directly compare with 12CO (1-0), 12CO (2-1), and 13CO (1-0) maps of nearly identical (~4.5") resolution. While all four transitions show similar basic morphology, there are spatial differences between the 12CO and 13CO transitions that show up in ratio maps. In particular, the 13CO (2-1)/13CO (1-0) ratio has a markedly different distribution across the nuclear region than does 12CO (2-1)/12CO (1-0), indicating that 12CO and 13CO trace different components of the molecular gas. These differences are explained if 12CO traces the warm, photodissociation region ``skins'' of the clouds and 13CO traces the cooler, interior portions constituting the bulk of the molecular gas. We derive excitation temperatures for the bulk of the cloud mass of ~10-20 K and densities of ~103.7 cm-2 along the molecular minispiral.

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