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Deep Imaging of the HCG 95 Field. I. Ultra-diffuse Galaxies
Shi, Dong Dong1,2; Zheng, Xian Zhong1,2,3; Bin Zhao, Hai1,4; Pan, Zhi Zheng1; Li, Bin1,4; Zou, Hu5; Zhou, Xu5; Guo, KeXin6; An, Fang Xia1; Li YB(李宇斌)7,8,9; Shi, Dong Dong(Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Peoples R China)
发表期刊ASTROPHYSICAL JOURNAL
2017-09-01
卷号846期号:1
DOI10.3847/1538-4357/aa8327
产权排序第7完成单位
收录类别SCI
关键词Galaxies: Evolution Galaxies: Groups: Individual (Hcg 95) Galaxies: Structure
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.
项目资助者National Basic Research Program of China (973 Program)(2013CB834900) ; National Natural Science Foundation of China(U1331110) ; Chinese Academy of Sciences (CAS)
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000408687300003
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SURFACE BRIGHTNESS GALAXIES ; HICKSON COMPACT-GROUPS ; FAINT DWARF GALAXIES ; LOCAL UNIVERSE ; VIRGO CLUSTER ; CATALOG ; HI ; ENVIRONMENT ; LUMINOSITY ; POPULATION
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11890
专题高能天体物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Shi, Dong Dong(Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Peoples R China)
作者单位1.Purple Mountain Observatory, Chinese Academy of Sciences, 2 West Beijing Road, Nanjing 210008, China
2.School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei 230026, China
3.Chinese Academy of Science South America Center for Astronomy, China-Chile Joint Center for Astronomy, Camino EI Observatorio #1515, Las Condes, Santiago, Chile
4.Key Laboratory of Planetary Sciences, Chinese Academy of Sciences, 2 West Beijing Road, Nanjing 210008, China
5.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
6.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
7.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China
8.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China
9.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China
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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).
APA Shi, Dong Dong.,Zheng, Xian Zhong.,Bin Zhao, Hai.,Pan, Zhi Zheng.,Li, Bin.,...&Shi, Dong Dong.(2017).Deep Imaging of the HCG 95 Field. I. Ultra-diffuse Galaxies.ASTROPHYSICAL JOURNAL,846(1).
MLA Shi, Dong Dong,et al."Deep Imaging of the HCG 95 Field. I. Ultra-diffuse Galaxies".ASTROPHYSICAL JOURNAL 846.1(2017).
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