ALMA-JELLY II. Constraining the radial profiles of the quenching timescales in ram-pressure-stripped galaxies
Year: 2026
Type: preprint
Abstract: We investigate the environmental quenching histories and spatial progression of ram-pressure stripping in 11 galaxies in the nearby Coma, Norma, and A1367 clusters. As part of the ALMA-JELLY large program, we combine high-sensitivity VLT/MUSE integral-field spectroscopy with ultraviolet-to-far-infrared photometry in 37 spatially resolved disc apertures. The sample spans $\log(M_*/\mathrm{M}\odot)\sim7.5-10.5$ and includes galaxies undergoing active or recent ram-pressure stripping, identified through prominent H$α$ or UV tails. We use Bayesian spectrophotometric modelling with exponentially declining star-formation histories and show with mock data that combining spectra and photometry breaks parameter degeneracies and improves quenching-age constraints. All galaxies show quenched outer discs and relatively old ($\lesssim1$ Gyr) stellar populations. Massive galaxies ($\log(M_*/\mathrm{M}_\odot)>9.5$) exhibit clear outside-in quenching: inner regions quench about 500 Myr later than their outskirts. The small scatter in quenching age with distance from the truncation radius, despite differences in environment and stripping geometry, points to a common evolutionary sequence. Low-mass and dwarf galaxies instead show weak radial gradients, with quenching occurring more rapidly, typically within 300 Myr.
Source: arXiv (Cornell University)
Authors: Infurna, Roberto P., Fossati, Matteo, Boselli, Alessandro, Fumagalli, Michele, Kenney, Jeffrey D. P., Jáchym, Pavel, Sun, Ming, Brinks, Elias, Combes, Françoise, da Silva, Patricia, Grossová, Romana, Gwyn, Stephen, Hosogi, Kokoro, Ignesti, Alessandro, Koda, Jin, Palouš, Jan, Pichette, Nathanael, Ranasinghe, Sujith, Scott, Tom C., Souchereau, Harrison J., Tiwari, Juhi, Vollmer, Bernd, Werner, Norbert, Yagi, Masafumi
Institutions: University of Milano-Bicocca, Brera Astronomical Observatory, Centre National de la Recherche Scientifique, Aix-Marseille Université, Osservatorio Astronomico di Cagliari, National Institute for Astrophysics, Trieste Astronomical Observatory, Yale University, Czech Academy of Sciences, Astronomical Institute, University of Alabama in Huntsville, University of Hertfordshire, Collège de France, Université Paris Sciences et Lettres, Observatoire de Paris, Sorbonne Université, Canada–France–Hawaii Telescope, University of Wisconsin–Milwaukee, Stony Brook University, University of Calgary, Institute of Astrophysics and Space Sciences, Observatoire astronomique de Strasbourg, Université de Strasbourg, Masaryk University, National Astronomical Observatory of Japan
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, National Aeronautics and Space Administration, Alfred P. Sloan Foundation, California Institute of Technology, Space Telescope Science Institute, Indian Space Research Organisation, Grantová Agentura České Republiky, Korea Astronomy and Space Science Institute, Centre National de la Recherche Scientifique, National Science and Technology Council, Jet Propulsion Laboratory, National Institutes of Natural Sciences
OpenAlex ID: W7213353696