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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; Bin Li, Yu7,8,9
2017-09-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume846Issue:1Pages:16
Corresponding AuthorShi, Dong Dong(ddshi@pmo.ac.cn)
AbstractWe 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.
Keywordgalaxies: evolution galaxies: groups: individual (HCG 95) galaxies: structure
DOI10.3847/1538-4357/aa8327
WOS KeywordSURFACE BRIGHTNESS GALAXIES ; HICKSON COMPACT-GROUPS ; FAINT DWARF GALAXIES ; LOCAL UNIVERSE ; VIRGO CLUSTER ; CATALOG ; HI ; ENVIRONMENT ; LUMINOSITY ; POPULATION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000408687300003
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22665
Collection中国科学院紫金山天文台
Corresponding AuthorShi, Dong Dong
Affiliation1.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China
3.Chinese Acad Sci South Amer Ctr Astron, China Chile Joint Ctr Astron, Camino EI Observat 1515, Santiago, Chile
4.Chinese Acad Sci, Key Lab Planetary Sci, 2 West Beijing Rd, Nanjing 210008, Peoples R China
5.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
6.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
7.Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China
8.Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China
9.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
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):16.
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),16.
MLA Shi, Dong Dong,et al."Deep Imaging of the HCG 95 Field. I. Ultra-diffuse Galaxies".ASTROPHYSICAL JOURNAL 846.1(2017):16.
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