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Quenching in cosmic sheets: Tracing the impact of large scale structure collapse on the evolution of Dwarf galaxies

Pasha, Imad, Mandelker, Nir, van den Bosch, Frank C., Springel, Volker and van de Voort, Freeke ORCID: 2023. Quenching in cosmic sheets: Tracing the impact of large scale structure collapse on the evolution of Dwarf galaxies. Monthly Notices of the Royal Astronomical Society 520 (2) , pp. 2692-2708. 10.1093/mnras/stac3776

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Dwarf galaxies are thought to quench primarily due to environmental processes most typically occurring in galaxy groups and clusters or around single, massive galaxies. However, at earlier epochs, (5 < z < 2), the collapse of large scale structure (forming Zel’dovich sheets and subsequently filaments of the cosmic web) can produce volume-filling accretion shocks which elevate large swaths of the intergalactic medium (IGM) in these structures to a hot (T > 106 K) phase. We study the impact of such an event on the evolution of central dwarf galaxies (5.5 < log M* < 8.5) in the field using a spatially large, high resolution cosmological zoom simulation which covers the cosmic web environment between two protoclusters. We find that the shock-heated sheet acts as an environmental quencher much like clusters and filaments at lower redshift, creating a population of quenched, central dwarf galaxies. Even massive dwarfs which do not quench are affected by the shock, with reductions to their sSFR and gas accretion. This process can potentially explain the presence of isolated quenched dwarf galaxies, and represents an avenue of pre-processing, via which quenched satellites of bound systems quench before infall.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 3 February 2023
Date of Acceptance: 15 December 2022
Last Modified: 03 May 2023 07:55

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