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GASP XXIV. The history of abruptly quenched galaxies in clusters

The study of cluster post starburst galaxies gives useful insights on the physical processes quenching the star formation in the most massive environments. Exploiting the MUSE data of the GAs Stripping Phenomena in galaxies (GASP) project, we characterise the quenching history of 8 local cluster gal...

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Published in:	arXiv.org 2020-03
Main Authors:	Vulcani, B, Fritz, J, Poggianti, B M, Bettoni, D, Franchetto, A, Moretti, A, Gullieuszik, M, Yaffe, Y L, Biviano, A, Radovich, M, Mingozzi, M
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Language:	English
Subjects:	Emission spectra Galactic clusters Galactic evolution Kinematics Line spectra Luminosity Morphology Quenching Ram pressure Star & galaxy formation Star formation Starburst galaxies Stellar age Stripping
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creator	Vulcani, B Fritz, J Poggianti, B M Bettoni, D Franchetto, A Moretti, A Gullieuszik, M Yaffe, Y L Biviano, A Radovich, M Mingozzi, M
description	The study of cluster post starburst galaxies gives useful insights on the physical processes quenching the star formation in the most massive environments. Exploiting the MUSE data of the GAs Stripping Phenomena in galaxies (GASP) project, we characterise the quenching history of 8 local cluster galaxies that were selected for not showing emission lines in their fiber spectra. We inspect the integrated colors, the Hb rest frame equivalent widths (EW), star formation histories (SFHs) and luminosity-weighted age (LWA) maps finding no signs of current star formation throughout the disks of these early-spiral/S0 galaxies. All of them have been passive for at least 20 Myr, but their SF declined on different timescales. In most of them the outskirts reached undetectable SFRs before the inner regions (outside-in quenching). Our sample includes three post-starforming galaxies, two passive galaxies and three galaxies with intermediate properties. The first population shows blue colors, deep Hb in absorption (EW>>2.8A), young ages (8.8
doi_str_mv	10.48550/arxiv.2003.02274
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The history of abruptly quenched galaxies in clusters</title><source>Publicly Available Content (ProQuest)</source><creator>Vulcani, B ; Fritz, J ; Poggianti, B M ; Bettoni, D ; Franchetto, A ; Moretti, A ; Gullieuszik, M ; Yaffe, Y L ; Biviano, A ; Radovich, M ; Mingozzi, M</creator><creatorcontrib>Vulcani, B ; Fritz, J ; Poggianti, B M ; Bettoni, D ; Franchetto, A ; Moretti, A ; Gullieuszik, M ; Yaffe, Y L ; Biviano, A ; Radovich, M ; Mingozzi, M</creatorcontrib><description>The study of cluster post starburst galaxies gives useful insights on the physical processes quenching the star formation in the most massive environments. Exploiting the MUSE data of the GAs Stripping Phenomena in galaxies (GASP) project, we characterise the quenching history of 8 local cluster galaxies that were selected for not showing emission lines in their fiber spectra. We inspect the integrated colors, the Hb rest frame equivalent widths (EW), star formation histories (SFHs) and luminosity-weighted age (LWA) maps finding no signs of current star formation throughout the disks of these early-spiral/S0 galaxies. All of them have been passive for at least 20 Myr, but their SF declined on different timescales. In most of them the outskirts reached undetectable SFRs before the inner regions (outside-in quenching). Our sample includes three post-starforming galaxies, two passive galaxies and three galaxies with intermediate properties. The first population shows blue colors, deep Hb in absorption (EW>>2.8A), young ages (8.8<log(LW [yr])<9.2). Two of these galaxies show signs of a central SF enhancement before quenching. Passive galaxies have instead red colors, EW(Hb)<2.8A, ages in the range 9.2<log(LWA[yr])<10. Finally, the other galaxies are most likely in transition between a post starforming and passive phase, as they quenched in an intermediate epoch and have not lost all the star forming features yet. The outside-in quenching, the morphology and kinematics of the stellar component, along with the position of these galaxies within massive clusters (sigma_cl=550-950km/s) point to a scenario in which ram pressure stripping has removed the gas, leading to quenching. Only the three most massive galaxies might alternatively have entered the clusters already quenched. 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subjects	Emission spectra Galactic clusters Galactic evolution Kinematics Line spectra Luminosity Morphology Quenching Ram pressure Star & galaxy formation Star formation Starburst galaxies Stellar age Stripping
title	GASP XXIV. The history of abruptly quenched galaxies in clusters
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