The SAMI Galaxy Survey: Quenching of Star Formation in Clusters III. Ram-Pressure-Affected Galaxy Populations

Author(s): Oğuzhan Çakır, Matt S. Owers, Luca Cortese, Mina Pak, Gabriella Quattropani, Stefania Barsanti, Julia J. Bryant, Warrick J. Couch, Scott M. Croom, Pratyush K. Das, Jon S. Lawrence, Yifan Mai, Andrei Ristea, Sebastian F. Sánchez, Sarah Sweet, Jesse van de Sande, Glenn van de Ven, Sukyoung K. Yi
Abstract: Cluster environments influence galaxy evolution by curtailing star formation activity, notably through ram-pressure stripping (RPS). In this study, using spatially resolved spectroscopic data from the SAMI Galaxy Survey, we identify galaxies undergoing or recently affected by RPS in eight nearby clusters ($0.029 < z < 0.058$), through a visual classification scheme based on the ionised gas ($\rm Hα+ [NII]λ6584$) morphologies, split into unperturbed, asymmetric, and truncated. The projected phase-space analysis shows that asymmetric galaxies are found in a narrow region in cluster-centric distance ($\rm 0.1 < R/R_{200} < 0.6$) and have a larger dispersion in line-of-sight velocity ($σ(|v_{pec}|)_\mathrm{Asym} = 0.71^{+0.09}_{-0.07}\ σ_{200}$) compared to the truncated and unperturbed samples. In terms of star formation activity, RPS candidates yield a much steeper resolved star-forming main sequence (rSFMS; $Σ_\mathrm{SFR} - Σ_\ast$) relation compared to the unperturbed counterparts, primarily emerging from having lower $Σ_\mathrm{SFR}$ values for the low mass density regime, with the steepest gradient deriving from the truncated sample. Moreover, radial star formation profiles reveal that star formation in RPS candidates is suppressed in the outskirts relative to unperturbed galaxies and is more prominent for the truncated sample. In contrast, central ($\rm r/r_{eff}
Organisation(s): Department of Astrophysics
Journal: Publications of the Astronomical Society of Australia
ISSN: 1323-3580
Publication date: 02-2026
Peer reviewed: Yes
Austrian Fields of Science 2012: 103003 Astronomy, 103004 Astrophysics
Keywords
Portal url: https://ucrisportal.univie.ac.at/en/publications/5c72a77b-b327-4a92-b4d8-f9143e7abfd3

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