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An on-going Arecibo line search between 1.1 and 10 GHz of the prototypical starburst/megamaser galaxy, Arp 220, has revealed a spectrum rich in molecular transitions. These include the prebiotic molecules: methanimine (CH2NH) in emission, three v2 = 1 direct l-type absorption lines of HCN, and an absorption feature from either 18OH or formic acid (HCOOH). In addition, we report three transitions of λ4-cm excited OH not previously detected in Arp 220 which are seen in absorption, and a possible absorption feature from the 6.668 GHz line of methanol. Our results mark the first distant extragalactic detection of methanimine, a molecule with high relevance to the origins of life. Further, the strong, previously undetected, cm-wave HCN v2 = 1 direct l-type lines can aid the study of dense molecular gas and active star-forming regions in this starburst galaxy.

Arecibo discovery of the pre-biotic molecule methanimine in Arp220 and new cm-wavelength transitions of other molecules