Rigging dark haloes: Why is hierarchical galaxy formation consistent with the inside-out build-up of thin discs?

C. Pichon, D. Pogosyan, T. Kimm, A. Slyz, J. Devriendt, Y. Dubois

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

State-of-the-art hydrodynamical simulations show that gas inflow through the virial sphere of dark matter haloes is focused (i.e. has a preferred inflow direction), consistent (i.e. its orientation is steady in time) and amplified (i.e. the amplitude of its advected specific angular momentum increases with time). We explain this to be a consequence of the dynamics of the cosmic web within the neighbourhood of the halo, which produces steady, angular momentum rich, filamentary inflow of cold gas. On large scales, the dynamics within neighbouring patches drives matter out of the surrounding voids, into walls and filaments before it finally gets accreted on to virialized dark matter haloes. As these walls/filaments constitute the boundaries of asymmetric voids, they acquire a net transverse motion, which explains the angular momentum rich nature of the later infall which comes from further away. We conjecture that this large-scale driven consistency explains why cold flows are so efficient at building up high-redshift thin discs inside out.

Original languageEnglish
Pages (from-to)2493-2507
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume418
Issue number4
DOIs
Publication statusPublished - 2011 Dec 1

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rigging
galactic evolution
angular momentum
halos
inflow
void
voids
dark matter
filaments
cold gas
gas
gases
simulation
cold

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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Rigging dark haloes : Why is hierarchical galaxy formation consistent with the inside-out build-up of thin discs? / Pichon, C.; Pogosyan, D.; Kimm, T.; Slyz, A.; Devriendt, J.; Dubois, Y.

In: Monthly Notices of the Royal Astronomical Society, Vol. 418, No. 4, 01.12.2011, p. 2493-2507.

Research output: Contribution to journalArticle

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