Cold CO in mergers - (C-12)O (1-0) and (C-12)O (2-1) mapping of NGC 2623 and ARP 220

Details Cold CO in mergers - (C-12)O (1-0) and (C-12)O (2-1) mapping of NGC 2623 and ARP 220 Cold CO in mergers - (C-12)O (1-0) and (C-12)O (2-1) mapping of NGC 2623 and ARP 220

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192l..17c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. L17-L20.

Astronomy and Astrophysics

Astrophysics

45

Carbon Monoxide, Cold Gas, Emission Spectra, Galaxies, Interstellar Gas, Far Infrared Radiation, Gas Dynamics

Scientific paper

The authors have mapped the two merger galaxies Arp 220 and NGC 2623 in 12CO(1-0) and 12CO(2-1) with the IRAM 30 m telescope, with 23arcsec and 14arcsec resolution. The measured H2 masses are 5.2×109 and 2.1×1010M_sun; for NGC 2623 and Arp 220 respectively. It is concluded that most of the CO emission comes from cold optically thick CO gas, a situation which does not differ from a typical spiral galaxy. It is confirmed that the emission from the active nucleus dominates the FIR luminosity of Arp 220. In NGC 2623, the strong CO(2-1) self-absorption suggests the presence of a hot central component surrounded by colder gas; it cannot be excluded that all the FIR luminosity comes from the starburst.

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