Lyman α absorption beyond the disc of simulated spiral galaxies

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Date

2020

Journal Title

Journal ISSN

Volume Title

Publisher

Oxford University Press

Abstract

We present an analysis of the origin and properties of the circumgalactic medium (CGM) in a suite of 11 cosmological zoom simulations resembling present-day spiral galaxies. On average the galaxies retain about 50 per cent of the cosmic fraction in baryons, almost equally divided into disc (interstellar medium) gas, cool CGM gas and warm-hot CGM gas. At radii smaller than 50 kpc the CGM is dominated by recycled warm-hot gas injected from the central galaxy, while at larger radii it is dominated by cool gas accreted on to the halo.

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Keywords

Line: profiles, Circumstellar matter, Galaxy: formation, Quasars: absorption lines

Citation

Dave´, R. et al. (2020). Lyman α absorption beyond the disc of simulated spiral galaxies. Monthly Notices of the Royal Astronomical Society, 496(1), 152–168