Deep Imaging of the HCG 95 Field.I.Ultra-diffuse Galaxies

Abstract

We present a detection of 89 candidates of ultra-diffuse galaxies (UDGs) in a 4.9 degree${}^2$ field centered on the Hickson Compact Group 95 (HCG 95) using deep $g$- and $r$-band images taken with the Chinese Near Object Survey Telescope. This field contains one rich galaxy cluster (Abell 2588 at $z$=0.199) and two poor clusters (Pegasus I at $z$=0.013 and Pegasus II at $z$=0.040). The 89 candidates are likely associated with the two poor clusters, giving about 50 $-$ 60 true UDGs with a half-light radius $r_{\mathrm{e}}>1.5$ kpc and a central surface brightness $\mu (g,0)>24.0$ mag arcsec${}^{-2}$. Deep $z$'-band images are available for 84 of the 89 galaxies from the Dark Energy Camera Legacy Survey (DECaLS), confirming that these galaxies have an extremely low central surface brightness. Moreover, our UDG candidates are spread over a wide range in $g-r$ color, and $\sim$26% are as blue as normal star-forming galaxies, which is suggestive of young UDGs that are still in formation. Interestingly, we find that one UDG linked with HCG 95 is a gas-rich galaxy with H I mass $1.1\times 10^9{M}_{\odot }$ detected by the Very Large Array, and has a stellar mass of $M_{\star }\sim 1.8\times 10^8$ $M_{\odot }$. This indicates that UDGs at least partially overlap with the population of nearly dark galaxies found in deep H I surveys. Our results show that the high abundance of blue UDGs in the HCG 95 field is favored by the environment of poor galaxy clusters residing in H I-rich large-scale structures.

Published in ApJ

References in corpus (12)

• Forty-Seven Milky Way-Sized, Extremely Diffuse Galaxies in the Coma Cluster
• NIHAO XI: Formation of Ultra-Diffuse Galaxies by outflows
• A High Stellar Velocity Dispersion and ~100 Globular Clusters for the Ultra Diffuse Galaxy Dragonfly 44
• Geometry of Star-Forming Galaxies from SDSS, 3D-HST and CANDELS
• Extensive Globular Cluster Systems Associated with Ultra Diffuse Galaxies in the Coma Cluster
• The Dragonfly Nearby Galaxies Survey. II. Ultra diffuse galaxies near the elliptical galaxy NGC 5485
• The nearest ultra diffuse galaxy: UGC2162
• (Almost) Dark HI Sources in the ALFALFA Survey: The Intriguing Case of HI1232+20
• Redshift, metallicity and size of two extended dwarf Irregular galaxies. A link between dwarf Irregulars and Ultra Diffuse Galaxies?
• Pattern recognition in the ALFALFA.70 and Sloan Digital Sky Surveys: A catalog of $\sim$ 500,000 HI gas fraction estimates based on artificial neural networks
• Stellar Systems in the direction of the Hickson Compact Group 44 - I. Low Surface Brightness Galaxies
• Faint Dwarf Galaxies in Hickson Compact Group 90

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