Deep Imaging of the HCG 95 Field. I. Ultra-diffuse Galaxies
Shi, Dong Dong; Zheng, Xian Zhong; Bin Zhao, Hai; Pan, Zhi Zheng; Li, Bin; Zou, Hu; Zhou, Xu; Guo, KeXin; An, Fang Xia; Bin Li, Yu
2017
发表期刊ASTROPHYSICAL JOURNAL
卷号846期号:1页码:26-
摘要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(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 similar to 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 x 10(9) M-circle dot detected by the Very Large Array, and has a stellar mass of M-star similar to 1.8 x 10(8) M-circle dot. 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.
语种英语
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/17471
专题中国科学院紫金山天文台研究生部_学生文章
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Shi, Dong Dong,Zheng, Xian Zhong,Bin Zhao, Hai,et al. Deep Imaging of the HCG 95 Field. I. Ultra-diffuse Galaxies[J]. ASTROPHYSICAL JOURNAL,2017,846(1):26-.
APA Shi, Dong Dong.,Zheng, Xian Zhong.,Bin Zhao, Hai.,Pan, Zhi Zheng.,Li, Bin.,...&Bin Li, Yu.(2017).Deep Imaging of the HCG 95 Field. I. Ultra-diffuse Galaxies.ASTROPHYSICAL JOURNAL,846(1),26-.
MLA Shi, Dong Dong,et al."Deep Imaging of the HCG 95 Field. I. Ultra-diffuse Galaxies".ASTROPHYSICAL JOURNAL 846.1(2017):26-.
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