The discovery and evolution of a radio continuum and excited-OH spectral-line outburst in the nearby galaxy NGC 660

C. J. Salter, T. Ghosh, R. F. Minchin +4

Arecibo 305-m Telescope observations between 2008 and 2018 detected a radio continuum and spectral-line outburst in the nearby galaxy, NGC 660. Excited-OH maser emission/absorption…