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The role of gas infall in the evolution of disc galaxies

Diaz, Ngeles I.; Molla, Mercedes; Lopez-Sanchez, Angel-R.; Mollá, Mercedes; Díaz, Ángeles I.; Gibson, Brad K.; Cavichia, Oscar; López-Sánchez, Ángel R.

Authors

Ngeles I. Diaz

Mercedes Molla

Angel-R. Lopez-Sanchez

Mercedes Mollá

Ángeles I. Díaz

Oscar Cavichia

Ángel R. López-Sánchez

Abstract

Spiral galaxies are thought to acquire their gas through a protracted infall phase resulting in the inside-out growth of their associated discs. For field spirals, this infall occurs in the lower density environments of the cosmic web. The overall infall rate, as well as the galactocentric radius at which this infall is incorporated into the star-forming disc, plays a pivotal role in shaping the characteristics observed today. Indeed, characterising the functional form of this spatio-temporal infall in-situ is exceedingly difficult, and one is forced to constrain these forms using the present day state of galaxies with model or simulation predictions. We present the infall rates used as input to a grid of chemical evolution models spanning the mass spectrum of discs observed today. We provide a systematic comparison with alternate analytical infall schemes in the literature, including a first comparison with cosmological simulations. Identifying the degeneracies associated with the adopted infall rate prescriptions in galaxy models is an important step in the development of a consistent picture of disc galaxy formation and evolution.

Journal Article Type Article
Publication Date Oct 21, 2016
Journal Monthly notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 462
Issue 2
Pages 1329-1340
Institution Citation Mollá, M., Díaz, Á. I., Gibson, B. K., Cavichia, O., & López-Sánchez, Á. R. (2016). The role of gas infall in the evolution of disc galaxies. Monthly notices, containing papers, abstracts of papers, and reports of the proceedings of the Society, 462(2), (1329-1340). doi:10.1093/mnras/stw1723. ISSN 0035-8711
DOI https://doi.org/10.1093/mnras/stw1723
Keywords Galaxies : formation; Galaxies : discs; Galaxies : gas
Publisher URL http://mnras.oxfordjournals.org/content/462/2/1329
Copyright Statement © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Additional Information This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Copyright Statement
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society



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