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Predictions for the angular dependence of gas mass flow rate and metallicity in the circumgalactic medium

Péroux, Céline, Nelson, Dylan, van de Voort, Freeke ORCID:, Pillepich, Annalisa, Marinacci, Federico, Vogelsberger, Mark and Hernquist, Lars 2020. Predictions for the angular dependence of gas mass flow rate and metallicity in the circumgalactic medium. Monthly Notices of the Royal Astronomical Society 499 (2) , 2462–2473. 10.1093/mnras/staa2888

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We use cosmological hydrodynamical simulations to examine the physical properties of the gas in the circumgalactic media (CGM) of star-forming galaxies as a function of angular orientation. We utilize TNG50 of the IllustrisTNG project, as well as the EAGLE simulation to show that observable properties of CGM gas correlate with azimuthal angle, defined as the galiocentric angle with respect to the central galaxy. Both simulations are in remarkable agreement in predicting a strong modulation of flow rate direction with azimuthal angle: inflow is more substantial along the galaxy major axis, while outflow is strongest along the minor axis. The absolute rates are noticeably larger for higher (⁠log(M⋆/M⊙)∼10.5⁠) stellar mass galaxies, up to an order of magnitude compared to M˙≲1 M⊙ yr−1 sr−1 for log(M⋆/M⊙)∼9.5 objects. Notwithstanding the different numerical and physical models, both TNG50 and EAGLE predict that the average metallicity of the CGM is higher along the minor versus major axes of galaxies. The angular signal is robust across a wide range of galaxy stellar mass 8.5

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Additional Information: PDF added in accordance with publisher's polices at:
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 10 November 2020
Date of Acceptance: 16 September 2020
Last Modified: 05 May 2023 09:57

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