Abstract
ABSTRACTWe present the most sensitive and extensive survey yet performed of extragalactic H 2 CO 6 cm (4.829 GHz)emission/absorption. Sixty-two sources were observed with the C-band system of the Arecibo Telescope to a 1rms noise level of 0.3 mJy. We report a new detection of H 2 CO 6 cm absorption toward NGC 520 and theconfirmation of H 2 CO 6 cm absorption toward several sources. We report confirmation of H 2 CO 6 cm emissiontoward the OH megamasers Arp 220, IC 860, and IRAS 15107+0724. At present these are the only extragalacticH 2 CO 6 cm emitters independently confirmed. A characterization of the properties of formaldehyde absorbersand emitters based on infrared properties of the galaxiesis discussed. We also conducted a simultaneous surveyof the H110 hydrogen recombination line toward a sample of 53 objects. We report the detection of H110toward the giant extragalactic H ii region NGC 604 in M33.Subject headinggs: galaxies: ISM — ISM: molecules — radio lines: galaxies1. INTRODUCTIONMore than 20 molecular species have been detected towardextragalactic regions during the last decades (e.g., Henkel MTakanoetal.1995),formaldehyde(H
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