Galaxy Zoo: the interplay of quenching mechanisms in the group environment★

Smethurst, Rebecca; Lintott, Chris; Bamford, Steven P.; Hart, Ray L.; Kruk, Sandor; Masters, Karen L.; Nichol, R. C.; Simmons, Brooke

doi:10.1093/mnras/stx973

Cited by 51 publications

(49 citation statements)

References 200 publications

(273 reference statements)

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“…Together, these results motivate a complex picture of galaxy evolution wherein internal mechanisms scaling with stellar mass and mechanisms scaling with environment work in tandem to transform blue, star-forming galaxies to red and quiescent ones (e.g. van den Bosch et al 2008;Peng et al 2010Peng et al , 2012Woo et al 2013;Smethurst et al 2017). This evolutionary picture is supported by the fact that the total amount of stellar mass in red sequence galaxies has roughly doubled since z=1 (e.g.…”

Section: Introductionmentioning

confidence: 89%

Red Misfits in the Sloan Digital Sky Survey: properties of star-forming red galaxies

Evans

Parker

Roberts

2018

Monthly Notices of the Royal Astronomical Society

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We study Red Misfits, a population of red, star-forming galaxies in the local Universe. We classify galaxies based on inclination-corrected optical colours and specific star formation rates derived from the Sloan Digital Sky Survey Data Release 7. Although the majority of blue galaxies are star-forming and most red galaxies exhibit little to no ongoing star formation, a small but significant population of galaxies (∼11 per cent at all stellar masses) are classified as red in colour yet actively star-forming. We explore a number of properties of these galaxies and demonstrate that Red Misfits are not simply dusty or highly-inclined blue cloud galaxies or quiescent red galaxies with poorly-constrained star formation. The proportion of Red Misfits is nearly independent of environment and this population exhibits both intermediate morphologies and an enhanced likelihood of hosting an AGN. We conclude that Red Misfits are a transition population, gradually quenching on their way to the red sequence and this quenching is dominated by internal processes rather than environmentally-driven processes. We discuss the connection between Red Misfits and other transition galaxy populations, namely S0's, red spirals and green valley galaxies.

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Section: Introductionmentioning

confidence: 89%

Red Misfits in the Sloan Digital Sky Survey: properties of star-forming red galaxies

Evans

Parker

Roberts

2018

Monthly Notices of the Royal Astronomical Society

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“…Alternatively, different environmentally-dependent processes have the same timescales and eventual results, either individually or when acting in combination (see e.g. Smethurst et al 2017).…”

Section: Environmentmentioning

confidence: 99%

Galaxy and Mass Assembly (GAMA): Morphological transformation of galaxies across the green valley

Bremer

Phillipps

Kelvin

et al. 2018

Monthly Notices of the Royal Astronomical Society

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We explore constraints on the joint photometric and morphological evolution of typical low redshift galaxies as they move from the blue cloud through the green valley and onto the red sequence. We select GAMA survey galaxies with 10.25 < log(M * /M ) < 10.75 and z < 0.2 classified according to their intrinsic u * − r * colour. From single component Sérsic fits, we find that the stellar mass-sensitive K−band profiles of red and green galaxy populations are very similar, while g−band profiles indicate more disk-like morphologies for the green galaxies: apparent (optical) morphological differences arise primarily from radial mass-to-light ratio variations. Two-component fits show that most green galaxies have significant bulge and disk components and that the blue to red evolution is driven by colour change in the disk. Together, these strongly suggest that galaxies evolve from blue to red through secular disk fading and that a strong bulge is present prior to any decline in star formation. The relative abundance of the green population implies a typical timescale for traversing the green valley ∼ 1 − 2 Gyr and is independent of environment, unlike that of the red and blue populations. While environment likely plays a rôle in triggering the passage across the green valley, it appears to have little effect on time taken. These results are consistent with a green valley population dominated by (early type) disk galaxies that are insufficiently supplied with gas to maintain previous levels of disk star formation, eventually attaining passive colours. No single event is needed quench their star formation.

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“…Star formation (SF) quenching is higher for more massive galaxies, and increases at fixed stellar mass with environmental density (given either by local density or halo mass) as becomes evident from the strong correlations of the fractions of quiescent galaxies with stellar mass, environment and halo-centric radius, found both locally (Wetzel et al 2012) and at high redshift (Peng et al 2010;Muzzin et al 2012;Lin et al 2014;Jian et al 2017;Kawinwanichakij et al 2017). Besides, the way in which red and quiescent fractions vary with environment and stellar mass are different for central and satellite galaxies (Weinmann et al 2006;Wetzel et al 2012;Kovač et al 2014;Darvish et al 2017;Smethurst et al 2017;Wang et al 2017).…”

mentioning

confidence: 99%

Semi-analytic galaxies – I. Synthesis of environmental and star-forming regulation mechanisms

Cora

Vega-Martínez

Hough

et al. 2018

Monthly Notices of the Royal Astronomical Society

128

153

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We present results from the semi-analytic model of galaxy formation sag applied on the MultiDark simulation MDPL2. sag features an updated supernova (SN) feedback scheme and a robust modelling of the environmental effects on satellite galaxies. This incorporates a gradual starvation of the hot gas halo driven by the action of ram pressure stripping (RPS), that can affect the cold gas disc, and tidal stripping (TS), which can act on all baryonic components. Galaxy orbits of orphan satellites are integrated providing adequate positions and velocities for the estimation of RPS and TS. The star formation history and stellar mass assembly of galaxies are sensitive to the redshift dependence implemented in the SN feedback model. We discuss a variant of our model that allows to reconcile the predicted star formation rate density at z 3 with the observed one, at the expense of an excess in the faint end of the stellar mass function at z = 2. The fractions of passive galaxies as a function of stellar mass, halo mass and the halo-centric distances are consistent with observational measurements. The model also reproduces the evolution of the main sequence of star forming central and satellite galaxies. The similarity between them is a result of the gradual starvation of the hot gas halo suffered by satellites, in which RPS plays a dominant role. RPS of the cold gas does not affect the fraction of quenched satellites but it contributes to reach the right atomic hydrogen gas content for more massive satellites (M 10 10 M ).

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Galaxy Zoo: the interplay of quenching mechanisms in the group environment★

Cited by 51 publications

References 200 publications

Red Misfits in the Sloan Digital Sky Survey: properties of star-forming red galaxies

Red Misfits in the Sloan Digital Sky Survey: properties of star-forming red galaxies

Galaxy and Mass Assembly (GAMA): Morphological transformation of galaxies across the green valley

Semi-analytic galaxies – I. Synthesis of environmental and star-forming regulation mechanisms

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