Dense and Warm Molecular Gas in Arp 220

Details Dense and Warm Molecular Gas in Arp 220 Dense and Warm Molecular Gas in Arp 220

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..966...77z&link_type=abstract

RELATIVISTIC ASTROPHYSICS: 4th Italian-Sino Workshop. AIP Conference Proceedings, Volume 966, pp. 77-84 (2008).

Astronomy and Astrophysics

Astrophysics

Molecular Clouds, H2 Clouds, Dense Clouds, And Dark Clouds, Astronomical Observations, Star Formation, Galaxy Mergers, Collisions, And Tidal Interactions, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies

Scientific paper

We present the results from the observations of Arp 220 in multiple CO spectral line transitions of J = 6-5, J = 3-2, J = 2-1 and the isotope 13CO at J = 2-1 at 690, 340 and 230 GHz using the Submillimeter Array (SMA) with the angular resolutions of sub-arcsec to a few arcsec. Based on the measured line ratios, we modeled the excitation conditions of the molecular clouds in the nuclear region of Arp 220, suggesting that the CO J = 6-5 emission arises from dense (n(H2)~105 cm-3) and warm (Tk~60 K) cloud components. Each of the four CO J = 6-5 clumps contains at least a few times 108 Msolar molecular gas. The dense and warm molecular clouds are likely the consequence of inelastic collisions between the molecular clouds in the counterrotating nuclear disks. Properties determined from these high-density regions suggest that they are in the early stage of star formation. The study of Arp 220 could provide us detailed information on the astrophysical processes in the galaxies at high red-shifts.

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