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Observing nearby galaxies would facilitate the search for artificial radiosignals by sampling many billions of stars simultaneously, but few efforts havebeen made to exploit this opportunity. An added attraction is that the MilkyWay is the second-largest member of the Local Group, so our galaxy might be aprobable target for hypothetical broadcasters in nearby galaxies. We presentthe first relatively high spectral resolution (<1 kHz) 21 cm band search forintelligent radio signals of complete galaxies in the Local Group with theJansky VLA, observing the galaxies M31 (Andromeda) and M33 (Triangulum) - thefirst and third largest members of the group respectively - sampling more starsthan any prior search of this kind. We used 122 Hz channels over a 1 MHzspectral window in the target galaxy velocity frame of reference, and 15 Hzchannels over a 125 kHz window in our local standard of rest. No narrowbandsignals were detected above a signal-to-noise ratio of 7, suggesting theabsence of continuous narrowband flux greater than approximately 0.24 Jy and1.33 Jy in the respective spectral windows illuminating our part of the MilkyWay during our observations in December 2014 and January 2015. This is also thefirst study in which the upgraded VLA has been used for SETI.

A VLA Search for Radio Signals from M31 and M33