Red, Gas-Rich Low Surface Brightness Galaxies and Enigmatic Deviations from the Tully-Fisher Relation

Abstract

Using the refurbished 305 m Arecibo Gregorian Telescope, we detected 43 low surface brightness (LSB) galaxies from the 1997 catalog of O'Neil, Bothun, & Cornell. The detected galaxies range from 22.0 mag arcsec-2 =200 km s-1 and yet are at least an order of magnitude below L* in total luminosity. As such, they represent extreme departures from the standard Tully-Fisher relation. In fact, our sample does not appear to have any significant correlation between the velocity widths and absolute magnitudes, with only 40% of the galaxies falling within the 1 σ low surface brightness galaxy Tully-Fisher relation. Overall, the discovery of very red, sub-L* but very gas-rich LSB galaxies in the nearby Universe has increased, once again, the overall parameter space occupied by disk galaxies.