HCN in the Central 300 PC of the Galaxy

Details HCN in the Central 300 PC of the Galaxy HCN in the Central 300 PC of the Galaxy

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18311607j&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #116.07; Bulletin of the American Astronomical Society, Vol. 25, p.1467

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Using the QUARRY array on the FCRAO, we have mapped HCN 1-0 emission from the central 300 pc of the Galaxy. Since HCN has a high dipole moment, it unambiguously traces dense molecular gas. We find that the HCN/CO 1-0 luminosity ratio for the central 300 pc is 0.18, larger than that for M82 (0.07), but smaller than that for NGC 253 (0.23) and NGC 1068 (0.4 - 0.9). The Galactic HCN luminosity, however, is much smaller than that for starburst galaxies, by factors of 2 - 40. These results suggest that the average gas densities are similarly large in the Galactic Center and in starburst nuclei, but that the amount of dense gas is considerably smaller. Consequently, starburst nuclei most likely result from the accumulation of large amounts of dense molecular gas rather than an enhanced star forming efficiency.

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