Deep Imaging of the HCG 95 Field.I.Ultra-diffuse Galaxies
Dongdong Shi (1), Xianzhong Zheng (1), Haibin Zhao (1), Zhizheng Pan, (1), Bin Li (1), Hu Zou (2), Xu Zhou (2), Kexin Guo (3), Fangxia An (1),, Yubin Li (4) ((1) PMO, (2) NAOC, (3) PKU, (4) YNAO)

TL;DR
This study identifies 89 ultra-diffuse galaxy candidates in a specific field, revealing their diverse properties and environmental influences, including a gas-rich example, advancing understanding of UDG formation and distribution.
Contribution
First comprehensive detection and characterization of UDG candidates in the HCG 95 field, highlighting their properties and environmental dependence.
Findings
Approximately 50-60 true UDGs identified.
Some UDGs are as blue as star-forming galaxies.
Discovery of a gas-rich UDG with significant H I mass.
Abstract
We present a detection of 89 candidates of ultra-diffuse galaxies (UDGs) in a 4.9 degree field centered on the Hickson Compact Group 95 (HCG 95) using deep - and -band images taken with the Chinese Near Object Survey Telescope. This field contains one rich galaxy cluster (Abell 2588 at =0.199) and two poor clusters (Pegasus I at =0.013 and Pegasus II at =0.040). The 89 candidates are likely associated with the two poor clusters, giving about 50 60 true UDGs with a half-light radius kpc and a central surface brightness mag arcsec. Deep '-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 color, and 26% are as blue as…
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