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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Mapping H i in the NGC 4636 Galaxy Group with FAST
Research in Astronomy and Astrophysics, Volume 22, No. 9, Article 095016, Year 2022
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Description
This paper presents data from a 21 cm H i emission drift scan observation of a field partially covering the NGC 4636 galaxy group with the Five-hundred meter Aperture Radio Telescope (FAST). We construct a pipeline to reduce the data, and use SoFiA for source finding. When not contaminated by Radio Frequency Interference (RFI), the FAST observations are capable of detecting all of the galaxies previously detected by the Arecibo Legacy Fast ALFA (ALFALFA) survey in the same region. Comparing to ALFALFA for the detections in common, the FAST data show consistent integrated spectra when the H i disks are spatially unresolved, and capture more flux when the H i disks are resolved. The FAST data further reveal 10 new detections in the region mutually covered with ALFALFA, and 18 new detections beyond the footprint of ALFALFA. All of the new detections have the matching optical counterparts. For the member galaxies of the NGC 4636 group, the detection limit of FAST is deeper by 0.4 dex in H i mass than that of the ALFALFA data. After correcting for the incompleteness caused by RFI contamination, we show that the H i detection rate of galaxies rises steeply with radius out to the virial radius of the group, and flattens beyond that. We also examine four spatially resolved galaxy systems with potential tidal interaction features in detail. Considering that the data have been taken during the “shared-risk” period before a major source of local RFI was eliminated, the results highlight the power of FAST in detecting extragalactic H i. © 2022. National Astronomical Observatories, CAS and IOP Publishing Ltd.
Authors & Co-Authors
Zuo, Pei
China, Beijing
Peking University
Australia, Perth
International Centre for Radio Astronomy Research
Wang, Jing
China, Beijing
Peking University
Staveley-Smith, L.
Australia, Perth
International Centre for Radio Astronomy Research
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Lin, Xuchen
China, Beijing
Peking University
For, Biqing
Australia, Perth
International Centre for Radio Astronomy Research
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Westmeier, Tobias
Australia, Perth
International Centre for Radio Astronomy Research
Wang, Jie
China, Beijing
Chinese Academy of Sciences
Spekkens, Kristine
Canada, Kingston
Royal Military College of Canada
Kilborn, Virginia A.
Australia, Hawthorn
Swinburne University of Technology
Wong, O. Ivy
Australia, Perth
International Centre for Radio Astronomy Research
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Li, D. H.
China, Beijing
Chinese Academy of Sciences
China, Hangzhou
Zhejiang Lab
Lee-Waddell, Karen
Australia, Perth
International Centre for Radio Astronomy Research
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Catinella, Barbara
Australia, Perth
International Centre for Radio Astronomy Research
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Ho, Luis C.
China, Beijing
Peking University
Koribalski, Baerbel S.
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Australia, Penrith
Western Sydney University
Lee, Bumhyun
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Zhu, Ming
China, Beijing
Chinese Academy of Sciences
Statistics
Citations: 3
Authors: 17
Affiliations: 10
Identifiers
Doi:
10.1088/1674-4527/ac7f86
ISSN:
16744527
Research Areas
Environmental
Study Design
Cross Sectional Study
Case-Control Study
Study Approach
Quantitative