| Title | Deep Imaging of the HCG 95 Field. I. Ultra-diffuse Galaxies |
| Authors | 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 |
| Affiliation | Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Peoples R China. Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China. Chinese Acad Sci South Amer Ctr Astron, China Chile Joint Ctr Astron, Camino EI Observat 1515, Santiago, Chile. Chinese Acad Sci, Key Lab Planetary Sci, 2 West Beijing Rd, Nanjing 210008, Peoples R China. Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China. Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China. Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China. Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China. Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China. Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Peoples R China. Shi, DD (reprint author), Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China. |
| Keywords | galaxies: evolution galaxies: groups: individual (HCG 95) galaxies: structure SURFACE BRIGHTNESS GALAXIES HICKSON COMPACT-GROUPS FAINT DWARF GALAXIES LOCAL UNIVERSE VIRGO CLUSTER CATALOG HI ENVIRONMENT LUMINOSITY POPULATION |
| Issue Date | 2017 |
| Publisher | ASTROPHYSICAL JOURNAL |
| Citation | ASTROPHYSICAL JOURNAL.2017,846(1). |
| 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(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. |
| URI | http://hdl.handle.net/20.500.11897/471187 |
| ISSN | 0004-637X |
| DOI | 10.3847/1538-4357/aa8327 |
| Indexed | SCI(E) |
| Appears in Collections: | 科维理天文与天体物理研究所 |
