MeerKAT H i Observations of Low Surface Brightness/Ultradiffuse Galaxy Candidates Projected around Two Southern Loose Groups
Year: 2025
Type: article
Abstract: A large catalog of low surface brightness galaxies (LSBGs) from the Dark Energy Survey showed significant clustering around nearby galaxy groups and clusters. Using the HIPASS survey, we tried to determine the redshift of a subsample of these LSBGs and determine whether they were members of the groups they were projected near, but this was hampered by HIPASS’s high spectral rms. This Letter reports on MeerKAT H i observations to determine the redshifts of 52 LSBG candidates projected in the vicinity of two groups from our previous HIPASS study. The main goal is to investigate and ascertain whether these LSBGs are genuine group members. H i was detected with MeerKAT and redshifts were determined for only five of the 52 candidates within a velocity range of ±2500 km s−1 of their respective group velocities. All five H i detections were blue LSBGs, and two of them were confirmed to be ultradiffuse galaxies (UDGs). Both these UDGs were group members, while the other three detections were either foreground or background galaxies. In this Letter we explore scenarios that can explain the 90% nondetection. MeerKAT’s excellent sensitivity allows us to conclude that the majority of the nondetected candidates, particularly the blue galaxies, are not group members but lie at higher redshifts. However, this still leaves the open question of why Tanoglidis LSBG candidates, in particular the red ones, appear to be clustered in projection around nearby groups.
Institutions: North-West University, Purple Mountain Observatory, Institute of Astrophysics and Space Sciences, Zhejiang Lab, The University of Sydney, Seoul National University, University of Science and Technology of China, Chinese Academy of Sciences, Rhodes University, Max Planck Institute for Radio Astronomy, Commonwealth Scientific and Industrial Research Organisation, The University of Western Australia, International Centre for Radio Astronomy Research, Stellenbosch University, Universidad Andrés Bello, Tata Institute of Fundamental Research, National Centre for Radio Astrophysics, Xi’an Jiaotong-Liverpool University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,400
Funders: National Aeronautics and Space Administration, California Institute of Technology, National Research Foundation, Department of Science and Technology, Ministry of Science and Technology, India, Department of Atomic Energy, Government of India, National Natural Science Foundation of China, Bundesministerium für Bildung und Forschung, Chinese Academy of Sciences, National Research Foundation of Korea, Ministero degli Affari Esteri e della Cooperazione Internazionale, Xi’an Jiaotong-Liverpool University, Universidade do Porto, Ministry of Science and ICT, South Korea, Agencia Nacional de Investigación y Desarrollo, Jet Propulsion Laboratory, Science and Engineering Research Board, Fundação para a Ciência e a Tecnologia
Awards: Verbundprojekt 05A2017 - D-MeerKAT: Ein deutscher Beitrag zur Weiterentwicklung der Radioastronomie im Zentimeterwellenlängenbereich.Teilprojekt 3, G1148616821, G1483381719, G1927318017, G2129434930, G2255229624, G4193112251, G4319291905, G4427969018, G4504417286, G528320682, TWELVE BILLION YEARS THAT TRANSFORMED GALAXIES INTO WHAT THEY ARE TODAY: GALAXY EVOLUTION IN HIGH-DENSITY ENVIRONMENTS ACROSS TIME, G8167270756, G8331929895, G8532133479, G8864335727
OpenAlex ID: W4410136380