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These observations add to the so-far limited number of UDGs with resolved H\u2009i data. The targets are from contrasting non-cluster environments: UDG-B1 is projected in the outskirts of Hickson Compact Group 25 and Secco-dI-2 (SdI-2) is an isolated UDG. These UDGs also have contrasting effective radii with Re of 3.7\u00a0kpc (similar to the Milky Way) and 1.3\u00a0kpc, respectively. SdI-2 has an unusually large $\\frac{M_{\\rm H\\,{\\small I}}}{M_*}$ ratio \u00a0=\u00a028.9, confirming a previous single dish H\u2009i observation. Both galaxies display H\u2009i morphological and kinematic signatures consistent with a recent tidal interaction, which is also supported by observations from other wavelengths, including optical spectroscopy. Within the limits of the observations\u2019 resolution our analysis indicates that SdI-2 is dark matter dominated within its H\u2009i radius and this is also likely to be the case for UDG-B1. Our study highlights the importance of high spatial and spectral resolution H\u2009i observations for the study of the dark matter properties of UDGs.<\/jats:p>","DOI":"10.1093\/mnras\/stab390","type":"journal-article","created":{"date-parts":[[2021,2,10]],"date-time":"2021-02-10T03:49:17Z","timestamp":1612928957000},"page":"3953-3964","source":"Crossref","is-referenced-by-count":7,"title":["Resolved H\u00a0<scp>i<\/scp> in two ultra-diffuse galaxies from contrasting non-cluster environments"],"prefix":"10.1093","volume":"503","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3746-4859","authenticated-orcid":false,"given":"T C","family":"Scott","sequence":"first","affiliation":[{"name":"Institute of Astrophysics and Space Sciences (IA), Rua das Estrelas, P-4150-762 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7432-5225","authenticated-orcid":false,"given":"Chandreyee","family":"Sengupta","sequence":"additional","affiliation":[{"name":"Purple Mountain Observatory, No. 8 Yuanhua Road, Qixia District, Nanjing 210034, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2321-8657","authenticated-orcid":false,"given":"P","family":"Lagos","sequence":"additional","affiliation":[{"name":"Institute of Astrophysics and Space Sciences (IA), Rua das Estrelas, P-4150-762 Porto, Portugal"}]},{"given":"Aeree","family":"Chung","sequence":"additional","affiliation":[{"name":"Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea"}]},{"given":"O Ivy","family":"Wong","sequence":"additional","affiliation":[{"name":"CSIRO Astronomy\u00a0& Space Science, PO Box 1130, Bentley, WA 6102, Australia"},{"name":"ICRAR-M468, University of Western Australia, Crawley, WA 6009, Australia"},{"name":"ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Australia"}]}],"member":"286","published-online":{"date-parts":[[2021,2,11]]},"reference":[{"key":"2022021101034274800_bib1","doi-asserted-by":"publisher","first-page":"L51","DOI":"10.1093\/mnrasl\/slw055","volume":"459","author":"Amorisco","year":"2016","journal-title":"MNRAS"},{"key":"2022021101034274800_bib2","first-page":"99","volume":"61","author":"Baars","year":"1977","journal-title":"A&A"},{"key":"2022021101034274800_bib3","doi-asserted-by":"crossref","first-page":"018","DOI":"10.1088\/1475-7516\/2016\/01\/018","volume":"2016","author":"Baushev","year":"2016","journal-title":"J. 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