===== First Extragalactic Detection of CO =====

L. J. Rickard, P. Palmer, M. Morris, B. E. Turner, and B. Zuckerman,\\
**[[https://ui.adsabs.harvard.edu/abs/1975ApJ...199L..75R|Detection of extragalactic carbon monoxide at millimeter wavelengths]]**,\\
//Astrophys. J.// **199**, L75-L78 (1974).

Source(s): M82, NGC253\\
Facility: NRAO 11m


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==== First Extragalactic Detection of 13CO ====

P. M. Solomon and R. de Zafra\\
**[[https://ui.adsabs.harvard.edu/abs/1975ApJ...199L..79S|Carbon monoxide in external galaxies]]**,\\
//Astrophys. J.// **199**, L79-L83 (1974).

Source(s): M82\\
Facility: NRAO 11m


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==== First Extragalactic Detection of C17O and C18O ====

L. J. Sage, C. Henkel, and R. Mauersberger,\\
**[[https://ui.adsabs.harvard.edu/abs/1991A%26A...249...31S|Extragalactic O-18/O-17 ratios and star formation - High-mass stars preferred in starburst systems?]]**,\\
//Astron. Astrophys.// **249**, 31-35 (1991).

Source(s): M82, NGC253, tentatively: IC 342\\
Facility: IRAM 30m, NRAO 12m


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Contributor(s): S. Thorwirth, 09/2005

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