Stellar age gradients and inside-out star formation quenching in galaxy bulges

Breda, Iris; Papaderos, P.; Gomes, J. M.; Vı́lchez, J. M.; Ziegler, B.; Hirschmann, Michaela; Cardoso, Leandro S. M.; Lagos, P.; Buitrago, F.

doi:10.1051/0004-6361/201937193

Cited by 25 publications

(22 citation statements)

References 90 publications

(88 reference statements)

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“…In addition, the entire nuclear disc would be formed at the same time, either through star formation or the violent re-distribution of existing stars. In both cases, one would expect to find flat age profiles, in contrast to the observations presented here (see Breda et al 2020, for a detailed account of radial age profiles in galaxy bulges).…”

Section: Nuclear Discs In the Global Context Of Secular Evolutioncontrasting

confidence: 98%

Inside-out formation of nuclear discs and the absence of old central spheroids in barred galaxies of the TIMER survey

Bittner

Sánchez‐Blázquez

Gadotti

et al. 2020

A&A

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The centres of disc galaxies host a variety of structures built via both internal and external processes. In this study, we constrain the formation and evolution of these central structures, in particular, nuclear rings and nuclear discs, by deriving maps of mean stellar ages, metallicities, and [α/Fe] abundances. We use observations obtained with the MUSE integral-field spectrograph for the TIMER sample of 21 massive barred galaxies. Our results indicate that nuclear discs and nuclear rings are part of the same physical component, with nuclear rings constituting the outer edge of nuclear discs. All nuclear discs in the sample are clearly distinguished based on their stellar population properties. As expected in the picture of bar-driven secular evolution, nuclear discs are younger, more metal-rich, and exhibit lower [α/Fe] enhancements, as compared to their immediate surroundings. Moreover, nuclear discs exhibit well-defined radial gradients, with ages and metallicities decreasing, and [α/Fe] abundances increasing with radius out to the nuclear ring. Often, these gradients show no breaks from the edge of the nuclear disc up through the centre, suggesting that these structures extend to the very centres of galaxies. We argue that continuous (stellar) nuclear discs may form from a series of bar-built (initially gas-rich) nuclear rings that expand in their radius as the bar evolves. In this picture, nuclear rings are simply the (often) star-forming outer edge of nuclear discs. Finally, by combining our results with those taken from a accompanying kinematic study, we do not find evidence for the presence of large, dispersion-dominated components in the centres of these galaxies. This could be a result of quiet merger histories, despite the large galaxy masses, or, perhaps, due to high angular momentum and strong feedback processes preventing the formation of these kinematically hot components.

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Section: Nuclear Discs In the Global Context Of Secular Evolutioncontrasting

confidence: 98%

Inside-out formation of nuclear discs and the absence of old central spheroids in barred galaxies of the TIMER survey

Bittner

Sánchez‐Blázquez

Gadotti

et al. 2020

A&A

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“…MacArthur et al 2004;García-Benito et al 2017;Fraser-McKelvie et al 2018). Interestingly, the transition from positive to negative age gradients at ∼ 10 10 M similarly occurs for observed late-type galaxies (Breda & Papaderos 2018;Breda et al 2020). The apparent outside-in formation of dwarf galaxies may be due to stellar diffusion, mergers or stellar feedback heating the orbits of old stars (e.g.…”

Section: Inner/outer Age Differencessupporting

confidence: 74%

“…(< 10 10 M ) predominantly showing "outside-in" formation (e.g. Pérez et al 2013;Fraser-McKelvie et al 2018;Breda et al 2020) and high-mass galaxies (> 10 10 M ) showing "inside-out" formation (e.g. MacArthur et al 2004;García-Benito et al 2017;Fraser-McKelvie et al 2018).…”

Section: Inner/outer Age Differencesmentioning

confidence: 99%

“…Unlike their higher-mass counterparts, low-mass galaxies (𝑀 * 10 10 M ; in all environments) generally show flat (self-similar formation) or positive ("outside-in" formation) colour, age and sSFR profiles (e.g. van Zee 2001;MacArthur et al 2004;Pérez et al 2013;González Delgado et al 2014;Liu et al 2016Liu et al , 2017Nelson et al 2016;Wang et al 2017;Breda & Papaderos 2018;Fraser-McKelvie et al 2018;Breda et al 2020;Domínguez Sánchez et al 2020). Signatures of outside-in formation in dwarf galaxies may plausibly be due to stellar diffusion (Papaderos et al 2002), or mergers (Benítez-Llambay et al 2016) or feedback from star formation (Graus et al 2019) heating the orbits of old stars to the large radii.…”

Section: Introductionmentioning

confidence: 99%

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The age gradients of galaxies in EAGLE: outside-in quenching as the origin of young bulges in cluster galaxies

Pfeffer,

Bekki,

Couch

et al. 2022

Preprint

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Many disc galaxies in clusters have been found with bulges of similar age or younger than their surrounding discs, at odds with field galaxies of similar morphology and their expected inside-out formation. We use the EAGLE simulations to test potential origins for this difference in field and cluster galaxies. We find, in agreement with observations, that on average disc-dominated field galaxies in the simulations have older inner regions, while similar galaxies in groups and clusters have similarly aged or younger inner regions. This environmental difference is a result of outside-in quenching of the cluster galaxies. Prior to group/cluster infall, galaxies of a given present-day mass and morphology exhibit a similar evolution in their specific star formation rate (sSFR) profiles. Post-infall, the outer sSFRs of group and cluster galaxies significantly decrease due to interstellar medium stripping, while the central sSFR remains similar to field galaxies. Field disc galaxies instead generally retain radially increasing sSFR profiles. Thus, field galaxies continue to develop negative age gradients (younger discs), while cluster galaxies instead develop positive age gradients (younger bulges).

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“…Evidence for inside-out quenching being the dominant quenching mode has been suggested by other works (Lin et al 2017 ;Bluck et al 2020 ;Breda et al 2020 ;Brownson et al 2020 ). Such analyses have been in particular possible due to the emergence of large IFU galaxy surv e ys.…”

Section: Resolved Relationssupporting

confidence: 56%

MASCOT: an ESO–ARO legacy survey of molecular gas in nearby SDSS-MaNGA galaxies – I. First data release, and global and resolved relations between H2 and stellar content

Wylezalek

Cicone

Belfiore

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We present the first data release of the MaNGA-ARO Survey of CO Targets (MASCOT), an ESO Public Spectroscopic Survey conducted at the Arizona Radio Observatory (ARO). We measure the CO(1-0) line emission in a sample of 187 nearby galaxies selected from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey that has obtained integral field unit (IFU) spectroscopy for a sample of ∼ 10,000 galaxies at low redshift. The main goal of MASCOT is to probe the molecular gas content of star-forming galaxies with stellar masses >109.5 M⊙ and with associated MaNGA IFU observations and well-constrained quantities like stellar masses, star formation rates and metallicities. In this paper we present the first results of the MASCOT survey, providing integrated CO(1-0) measurements that cover several effective radii of the galaxy and present CO luminosities, CO kinematics, and estimated H2 gas masses. We observe that the decline of galaxy star formation rate with respect to the star formation main sequence (SFMS) increases with the decrease of molecular gas and with a reduced star formation efficiency, in agreement with results of other integrated studies. Relating the molecular gas mass fractions with the slope of the stellar age gradients inferred from the MaNGA observations, we find that galaxies with lower molecular gas mass fractions tend to show older stellar populations close to the galactic center, while the opposite is true for galaxies with higher molecular gas mass fractions, providing tentative evidence for inside-out quenching.

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Stellar age gradients and inside-out star formation quenching in galaxy bulges

Cited by 25 publications

References 90 publications

Inside-out formation of nuclear discs and the absence of old central spheroids in barred galaxies of the TIMER survey

Inside-out formation of nuclear discs and the absence of old central spheroids in barred galaxies of the TIMER survey

The age gradients of galaxies in EAGLE: outside-in quenching as the origin of young bulges in cluster galaxies

MASCOT: an ESO–ARO legacy survey of molecular gas in nearby SDSS-MaNGA galaxies – I. First data release, and global and resolved relations between H2 and stellar content

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