期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 506, 期 2, 页码 2753-2765出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab1817
关键词
instrumentation: interferometer; galaxies: evolution; galaxies: groups: individual; radio lines: galaxies
资金
- South African Research Chairs Initiative of the Department of Science and Innovation and National Research Foundation [77948]
- South African Radio Astronomy Observatory (SARAO)
- ESO programme [179.A2005, 179.A-2006]
- FIRST program from Japanese Cabinet Office
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS)
- Japan Science and Technology Agency (JST)
- Toray Science Foundation
- NAOJ
- Kavli IPMU
- KEK
- ASIAA
- Princeton University
- STFC consolidated grant [ST/S000488/1]
- South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation
- Glasstone Foundation
- STFC Ernest Rutherford Fellowship [ST/T003596/1]
- Bundesministerium fur Bildung und Forschung (BMBF) [05A20WM4]
- UK Science and Technology Facilities Council [ST/S000488/1, ST/N000919/1]
- Oxford Hintze Centre for Astrophysical Surveys from the Hintze Family Charitable Foundation
- MINECO/FEDER, UE [AYA2015-65973-C3-1-R, RTI2018-096228-B-C31]
- State Agency for Research of the Spanish Ministry of Science, Innovation and Universities through the `Center of Excellence SeveroOchoa' award [SEV-2017-0709]
- Inter-University Institute for Data Intensive Astronomy (IDIA)
- STFC [ST/S000488/1] Funding Source: UKRI
The study presents the serendipitous discovery of a galaxy group in the XMM-LSS field with rich gas content and galaxies with morphologies influenced by the environment. The group is suggested to be in the early stages of its assembly.
We present the serendipitous discovery of a galaxy group in the XMM-LSS field with MIGHTEE Early Science observations. 20 galaxies are detected in HI in this z similar to 0.044 group, with a 3 sigma column density sensitivity of N-HI = 1.6 x 10(20) cm(-2). This group has not been previously identified, despite residing in a well-studied extragalactic legacy field. We present spatially resolved HI total intensity and velocity maps for each of the objects which reveal environmental influence through disturbed morphologies. The group has a dynamical mass of log(10)(M-dyn/M-circle dot) = 12.32, and is unusually gas-rich, with an HI-to-stellar mass ratio of log(10)(f(HI*)) = -0.2, which is 0.7 dex greater than expected. The group's high HI content, spatial, velocity, and identified galaxy type distributions strongly suggest that it is in the early stages of its assembly. The discovery of this galaxy group is an example of the importance of mapping spatially resolved HI in a wide range of environments, including galaxy groups. This scientific goal has been dramatically enhanced by the high sensitivity, large field-of-view, and wide instantaneous bandwidth of the MeerKAT telescope.
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