Edge-on HI-bearing ultra diffuse galaxy candidates in the 40% ALFALFA catalog

Abstract

Ultra-diffuse galaxies (UDGs) are objects which have very extended morphology and faint central surface brightness. Most UDGs are discovered in galaxy clusters and groups, but also some are found in low density environments. The diffuse morphology and faint surface brightness make them difficult to distinguish from the sky background. Several previous works have suggested that at least some UDGs are consistent with exponential surface brightness profiles (Sérsic n ~ 1). The surface brightness of exponential disks is enhanced in edge-on systems, so searching for edge-on systems may be an efficient way to select UDGs. In this paper, we focus on searching for edge-on HI-bearing ultra-diffuse sources (HUDS) from the 40% ALFALFA catalog, based on SDSS g- and r-band images. After correcting the observed central surface brightness to a face-on perspective, we discover 11 edge-on HUDS candidates. All these newly discovered HUDS candidates are blue and HI-bearing, similar to other HUDS in 70% ALFALFA catalog, and different from UDGs in clusters.

arXiv comment13 Pages, 5 figures

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