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      Quenching, bursting, and galaxy shapes: colour transformation as a function of morphology

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          ABSTRACT

          Different mechanisms for quenching star formation in galaxies are commonly invoked in the literature, but the relative impact of each one at different cosmic epochs is still unknown. In particular, the relation between these processes and morphological transformation remains poorly understood. In this work, we measure the effectiveness of changes in star formation rates by analysing a new parameter, the Star Formation Acceleration (SFA), as a function of galaxy morphology. This methodology is capable of identifying both bursting and quenching episodes that occurred in the preceding 300 Myr. We use morphological classification catalogues based on Deep Learning techniques. Our final sample has ∼14 200 spirals and ∼2500 ellipticals. We find that elliptical galaxies in the transition region have median shorter quenching time-scales (τ < 1 Gyr) than spirals (τ ≥ 1 Gyr). This result conforms to the scenario in which major mergers and other violent processes play a fundamental role in galaxy evolution for most ellipticals, not only quenching star formation more rapidly but also playing a role in morphological transformation. We also find that ∼two-thirds of galaxies bursting in the green valley in our sample are massive spirals ($M_\star \ge 10^{11.0}\, \mathrm{M}_\odot$) with signs of disturbance. This is in accordance with the scenario where low-mass galaxies are losing their gas in an interaction with a massive galaxy: while the former is quenching, the last is being refueled and going through a burst, showing signs of recent interaction.

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          Dust extinction of the stellar continua in starburst galaxies: The ultraviolet and optical extinction law

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            Galaxy bimodality due to cold flows and shock heating

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              Stellar population synthesis at the resolution of 2003

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                Author and article information

                Contributors
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                Journal
                Monthly Notices of the Royal Astronomical Society
                Oxford University Press (OUP)
                0035-8711
                1365-2966
                January 2022
                December 02 2021
                January 2022
                December 02 2021
                November 10 2021
                : 509
                : 3
                : 3889-3903
                Affiliations
                [1 ]Observatório do Valongo, Universidade Federal do Rio de Janeiro, Ladeira do Pedro Antônio, 43 - Centro, Rio de Janeiro - RJ 20080-090, Brazil
                [2 ]European Southern Observatory, Karl-Schwarzschild-Straße 2, D-85748 Garching bei München, Germany
                [3 ]NAT-Universidade Cruzeiro do Sul / Universidade Cidade de São Paulo, Rua Galvão Bueno, 868, 01506-000 São Paulo, SP, Brazil
                [4 ]Instituto Nacional de Pesquisas Espaciais/MCT, 12227-010, São José dos Campos, SP, Brazil
                [5 ]NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA
                [6 ]Center for Space Science and Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
                [7 ]Department of Physics, University of Maryland Baltimore County, Baltimore, MD 21250, USA
                [8 ]Cahill Center for Astrophysics, California Institute of Technology, 1216 East California Boulevard, Pasadena, CA 91125, USA
                Article
                10.1093/mnras/stab3230
                3aa27cc2-f308-4edc-bb34-cecd05db246e
                © 2021

                https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model

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