The SAMI Galaxy Survey: Quenching of Star Formation in Clusters I. Transition Galaxies ...

• Main Authors: Owers, Matt S., Hudson, Michael J., Oman, Kyle A., Bland-Hawthorn, Joss, Brough, S., Bryant, Julia J., Cortese, Luca, Couch, Warrick, Croom, Scott M., van de Sande, Jesse, Federrath, Christoph, Groves, Brent, Hopkins, A. M., Lawrence, J. S., Lorente, Nuria P. F., McDermid, Richard M., Medling, Anne M., Richards, Samuel N., Scott, Nicholas, Taranu, Dan S., Welker, Charlotte, Yi, Sukyoung K.
• Format: Text
• Language: unknown
• Published: Swinburne 2024
• Subjects: sami
• Online Access: https://dx.doi.org/10.25916/sut.26250509; https://figshare.swinburne.edu.au/articles/journal_contribution/The_SAMI_Galaxy_Survey_Quenching_of_Star_Formation_in_Clusters_I_Transition_Galaxies/26250509

We use integral-field spectroscopy from the SAMI Galaxy Survey to identify galaxies that show evidence of recent quenching of star formation. The galaxies exhibit strong Balmer absorption in the absence of ongoing star formation in more than 10% of their spectra within the SAMI field of view. These Hd-strong (HDS) galaxies (HDSGs) are rare, making up only similar to 2% (25/1220) of galaxies with stellar mass log(M-*/M-circle dot) > 10. The HDSGs make up a significant fraction of nonpassive cluster galaxies (15%; 17/115) and a smaller fraction (2.0%; 8/387) of the nonpassive population in low-density environments. The majority (9/17) of cluster HDSGs show evidence of star formation at their centers, with the HDS regions found in the outer parts of the galaxy. Conversely, the HDS signal is more evenly spread across the galaxy for the majority (6/8) of HDSGs in low-density environments and is often associated with emission lines that are not due to star formation. We investigate the location of the HDSGs in ...