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Molecular clouds in the centers of galaxies: constraints from hcn and co-13 line emission
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Aalto, S. Johansson, L. E. B. Booth, R. S. Black, J. H. |
| Copyright Year | 1993 |
| Description | We have searched for HCN J=1-0 line emission in the centers of 12 galaxies and have detected it in 10 of them. We have obtained complementary data on J=1-0 and 2-1 transitions of CO-12 and CO-13 in these systems. The ratio of integrated intensities, I(CO 1-0)/I(HCN 1-0) = 25 +/- 11 for this sample. We find that HCN emission of this strength can be produced under conditions of subthermal excitation. In combination with the line ratios in CO and CO-13, HCN puts constraints on the mean conditions of molecular clouds and on the mix of cloud types within the projected beam. |
| File Size | 122230 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930017617 |
| Archival Resource Key | ark:/13960/t89h0k59k |
| Language | English |
| Publisher Date | 1993-01-01 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Hydrocyanic Acid Galaxies Molecular Excitation Emission Spectra Molecular Clouds Rotational Spectra Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
