Abstract
Toward the starburst nucleus of NGC 253, C-12/C-13 line intensity ratios from six carbon bearing molecules (CO, CN, CS, HCN, HCO+, and HNC) are used to confine the possible range of carbon and oxygen isotope ratios. A detailed analysis yields C-12/C-13 approximately 40 and O-16/O-18 approximately 200. Also reported are first detections of (CS)-C-13 and of the 0(0) - 1(-1) E line of methanol (CH3OH) in an extragalactic source.
Original language | English |
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Pages (from-to) | L17-L20 |
Number of pages | 4 |
Journal | Astronomy and Astrophysics |
Volume | 268 |
Publication status | Published - 1993 |