Angular Momentum Accretion onto Disc Galaxies

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Throughout the Hubble time, gas makes its way from the intergalactic medium into galaxies fuelling their star formation and promoting their growth. One of the key properties of the accreting gas is its angular momentum, which has profound implications for the evolution of, in particular, disc galaxies. Here, we discuss how to infer the angular momentum of the accreting gas using observations of present-day galaxy discs. We first summarize evidence for ongoing inside-out growth of star forming discs. We then focus on the chemistry of the discs and show how the observed metallicity gradients can be explained if gas accretes onto a disc rotating with a velocity 20 - 30% lower than the local circular speed. We also show that these gradients are incompatible with accretion occurring at the edge of the discs and flowing radially inward. Finally, we investigate gas accretion from a hot corona with a cosmological angular momentum distribution and describe how simple models of rotating coronae guarantee the inside-out growth of disc galaxies.
Originele taal-2English
TitelAstronomy in Focus - XXX
RedacteurenM. T. Lago
UitgeverijCambridge University Press
StatusPublished - 3-mrt.-2020
EvenementAstronomy in Focus XXX: Volume 14 - Symposium A30 - August 2018 - Viena, Australia
Duur: 20-aug.-201831-aug.-2018

Publicatie series

NaamProceedings of the International Astronomical Union
UitgeverijInternational Astronomical Union
ISSN van geprinte versie1743-9213
ISSN van elektronische versie1743-9221


ConferenceAstronomy in Focus XXX

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