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

Owers, Matt S.; Hudson, Michael J.; Oman, Kyle A.; Bland-Hawthorn, Joss; Brough, Sarah; Bryant, Julia J.; Cortese, Luca; Couch, Warrick J.; Croom, S. M.; Sande, Jesse van de; Federrath, Christoph; Groves, Brent; Hopkins, A. M.; Lawrence, Jon; Lorente, Nuria P. F.; McDermid, Richard M.; Medling, Anne M.; Richards, Samuel N.; Scott, Nicholas; Taranu, Dan S.; Welker, Charlotte; Yi, Sukyoung K.

doi:10.3847/1538-4357/ab0201

Cited by 93 publications

(85 citation statements)

References 191 publications

(301 reference statements)

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“…They show a range of kinematic properties: from dispersion-dominated kinematics reminiscent of quiescent galaxies (and consistent with the outcome of mergers; Hiner & Canalizo 2015) to rotation-supported systems (e.g. Norton et al 2001;Pracy et al 2013;Owers et al 2019). Chen et al (2019) find that stellar kinematics depend on the location of the PSB regions within the target galaxy.…”

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confidence: 69%

Inverse stellar population age gradients of post-starburst galaxies at z = 0.8 with LEGA-C

D’Eugenio

Wel

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We use deep, spatially resolved spectroscopy from the LEGA-C Survey to study radial variations in the stellar population of 17 spectroscopically-selected post-starburst (PSB) galaxies. We use spectral fitting to measure two Lick indices, HδA and Fe4383, and find that, on average, PSB galaxies have radially decreasing HδA and increasing Fe4383 profiles. In contrast, a control sample of quiescent, non-PSB galaxies in the same mass range shows outwardly increasing HδA and decreasing Fe4383. The observed gradients are weak (≈−0.2Å/Re), mainly due to seeing convolution. A two-SSP model suggests intrinsic gradients are as strong as observed in local PSB galaxies (≈−0.8Å/Re). We interpret these results in terms of inside-out growth (for the bulk of the quiescent population) vs star formation occurring last in the centre (for PSB galaxies). At z ≈ 0.8, central starbursts are often the result of gas-rich mergers, as evidenced by the high fraction of PSB galaxies with disturbed morphologies and tidal features (40%). Our results provide additional evidence for multiple paths to quiescence: a standard path, associated with inside-out disc formation and with gradually decreasing star-formation activity, without fundamental structural transformation, and a fast path, associated with centrally-concentrated starbursts, leaving an inverse age gradient and smaller half-light radius.

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confidence: 69%

Inverse stellar population age gradients of post-starburst galaxies at z = 0.8 with LEGA-C

D’Eugenio

Wel

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…Rowlands et al (2018) have used data from MaNGA to derive Star Formation Histories (SFHs) of different galaxy subpopulations finding that PSB regions are more common outside of the galaxy center, are preferentially found in asymmetric galaxies, and have lower gas-phase metallicity than other regions, consistent with interactions triggering starbursts and driving low-metallicity gas into regions at <1.5 effective radii. Owers et al (2019) used the Sydney-AAO Multiobject Integral field spectrograph Galaxy Survey (SAMI, Bryant et al 2015) data to characterise the rare (∼2% of galaxies with log(M * /M ) > 10) population of galaxies showing PSB features in more than 10% of their spectra. These galaxies are more frequent in clusters than in the low-density environments, representing 15% and 2% of non-passive galaxies, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Conversely, in low density environments the PSB signal is spread across the galaxies. The Owers et al (2019) study is the only one explicitly focused on cluster galaxies. 1 Also based on the analysis of the location of these galaxies within their clusters, they concluded that the galaxies recently entered the clusters and are currently being quenched by ram pressure stripping.…”

Section: Introductionmentioning

confidence: 99%

GASP XXIV. The History of Abruptly Quenched Galaxies in Clusters

Vulcani

Fritz²,

Poggianti

et al. 2020

ApJ

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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, and the Hβ rest frame equivalent widths (EW), star formation histories (SFHs) and luminosityweighted 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 Hβ in absorption (EW>>2.8Å), young ages (8.8< log(LWA[yr]) <9.2). Two of these galaxies show signs of a central SF enhancement before quenching. Passive galaxies have instead red colors, EW(Hβ)<2.8 A, 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 (σ cl = 550-950 km s −1 ) 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. These galaxies are therefore at the final stage of the rapid evolution galaxies undergo when they enter the cluster environment.

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“…From studies of galaxies that are actively being quenched (e.g. Koch et al 2012;Poggianti et al 2017;Jaffé et al 2018;Owers et al 2019;Zabel et al 2019) we can identify signatures of the different quenching mechanisms in terms of differing timescales and spatial distributions for the shut-down of star formation (e.g. Schaefer et al 2019).…”

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confidence: 99%

The SAMI–Fornax Dwarfs Survey I: sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies

Scott

Eftekhari

Peletier

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Dwarf ellipticals are the most common galaxy type in cluster environments, however the challenges associated with their observation mean their formation mechanisms are still poorly understood. To address this, we present deep integral field observations of a sample of 31 low-mass (107.5 < M⋆ < 109.5 M⊙) early-type galaxies in the Fornax cluster with the SAMI instrument. For 21 galaxies our observations are sufficiently deep to construct spatially resolved maps of the stellar velocity and velocity dispersion — for the remaining galaxies we extract global velocities and dispersions from aperture spectra only. From the kinematic maps we measure the specific stellar angular momentum λR of the lowest mass dE galaxies to date. Combining our observations with early-type galaxy data from the literature spanning a large range in stellar mass, we find that λR decreases towards lower stellar mass, with a corresponding increase in the proportion of slowly rotating galaxies in this regime. The decrease of λR with mass in our sample dE galaxies is consistent with a similar trend seen in somewhat more massive spiral galaxies from the CALIFA survey. This suggests that the degree of dynamical heating required to produce dEs from low-mass starforming progenitors may be relatively modest, and consistent with a broad range of formation mechanisms.

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

Cited by 93 publications

References 191 publications

Inverse stellar population age gradients of post-starburst galaxies at z = 0.8 with LEGA-C

Inverse stellar population age gradients of post-starburst galaxies at z = 0.8 with LEGA-C

GASP XXIV. The History of Abruptly Quenched Galaxies in Clusters

The SAMI–Fornax Dwarfs Survey I: sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies

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