English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Gas accretion and galactic fountain flows in the Auriga cosmological simulations: angular momentum and metal redistribution

Grand, R. J. J., van de Voort, F., Zjupa, J., Fragkoudi, F., Gómez, F. A., Kauffmann, G., et al. (2019). Gas accretion and galactic fountain flows in the Auriga cosmological simulations: angular momentum and metal redistribution. Monthly Notices of the Royal Astronomical Society, 490(4), 4786-4803. doi:10.1093/mnras/stz2928.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0005-C0CE-A Version Permalink: http://hdl.handle.net/21.11116/0000-0005-C0CF-9
Genre: Journal Article

Files

show Files
hide Files
:
Gas accretion and galactic fountain flows in the Auriga cosmological simulations angular momentum and metal redistribution.pdf (Any fulltext), 9MB
 
File Permalink:
-
Name:
Gas accretion and galactic fountain flows in the Auriga cosmological simulations angular momentum and metal redistribution.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Grand, Robert J. J.1, Author              
van de Voort, Freeke1, Author              
Zjupa, Jolanta, Author
Fragkoudi, Francesca2, Author              
Gómez, Facundo A., Author
Kauffmann, Guinevere3, Author              
Marinacci, Federico, Author
Pakmor, Rüdiger4, Author              
Springel, Volker2, Author              
White, Simon D. M.2, Author              
Affiliations:
1Galaxy Formation, Cosmology, MPI for Astrophysics, Max Planck Society, ou_159878              
2Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              
3Cosmology, MPI for Astrophysics, Max Planck Society, ou_159876              
4Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

Content

show
hide
Free keywords: -
 Abstract: Using a set of 15 high-resolution magnetohydrodynamic cosmological simulations of Milky Way formation, we investigate the origin of the baryonic material found in stars at redshift zero. We find that roughly half of this material originates from subhalo/satellite systems and half is smoothly accreted from the intergalactic medium. About 90 per cent of all material has been ejected and re-accreted in galactic winds at least once. The vast majority of smoothly accreted gas enters into a galactic fountain that extends to a median galactocentric distance of ∼20 kpc with a median recycling time-scale of ∼500 Myr. We demonstrate that, in most cases, galactic fountains acquire angular momentum via mixing of low angular momentum, wind-recycled gas with high angular momentum gas in the circumgalactic medium (CGM). Prograde mergers boost this activity by helping to align the disc and CGM rotation axes, whereas retrograde mergers cause the fountain to lose angular momentum. Fountain flows that promote angular momentum growth are conducive to smooth evolution on tracks quasi-parallel to the disc sequence of the stellar mass-specific angular momentum plane, whereas retrograde minor mergers, major mergers, and bar-driven secular evolution move galaxies towards the bulge sequence. Finally, we demonstrate that fountain flows act to flatten and narrow the radial metallicity gradient and metallicity dispersion of disc stars, respectively. Thus, the evolution of galactic fountains depends strongly on the cosmological merger history and is crucial for the chemodynamical evolution of Milky-Way-sized disc galaxies.

Details

show
hide
Language(s):
 Dates: 2019-10-18
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stz2928
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Monthly Notices of the Royal Astronomical Society
  Other :
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: OXFORD : OXFORD UNIV PRESS
Pages: - Volume / Issue: 490 (4) Sequence Number: - Start / End Page: 4786 - 4803 Identifier: ISSN: 0035-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470