The Neutral Gas Properties of Extremely Isolated Early-type Galaxies. II

As part of an ongoing study of isolated early-type galaxies (IEG), we present neutral hydrogen (H I) observations of six IEGs obtained with the Green Bank Telescope. Two of the six IEGs presented in this paper have detected H I emission (KIG 870 and SDSS J102145.89+383249.8). KIG 870 has an H I emission profile that is strongly asymmetric about the optical systemic velocity with a redshifted double-horned profile and a blueshifted single-peaked component. KIG 870 is likely an advanced merger system. SDSS J102145.89+383249.8 has a Gaussian-like profile, indicating that the H I is not strongly rotating, is in a face-on disk, or is in a thick-disk similar to a dwarf galaxy. Our parent sample of H I observations is composed of 12 IEGs, 7 of which have now been detected in H I. The dwarf and luminous IEGs in our parent sample have median H I-mass-to-blue-luminosity ratios that are each three times larger than that of their non-cluster ETG counterparts, indicating that IEGs in our sample are significantly more gas rich than non-cluster ETGs.