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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 709688.0, MPI für Astronomie / Publikationen_mpia
The role of cold flows and reservoirs in galaxy formation with strong feedback
Authors:Woods, R. M.; Wadsley, J.; Couchman, H. M. P.; Stinson, G.; Shen, S.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Monthly Notices of the Royal Astronomical Society
Volume:442
Issue / Number:1
Start Page:732
End Page:740
Audience:Not Specified
Abstract / Description:We examine gas accretion and subsequent star formation in representative galaxies from the McMaster Unbiased Galaxy Simulations. Accreted gas is bimodal with a natural temperature division at 105 K, near the peak of the cooling curve. Cold-mode accretion dominates inflows at early times, creating a peak in total accretion at redshift z = 2-4 and declining exponentially below z ˜ 2. Hot-mode accretion peaks near z = 1-2 and declines gradually. Hot-mode exceeds cold-mode accretion at z ˜ 1.8 for all four galaxies rather than when the galaxy reaches a characteristic mass. Cold-mode accretion can fuel immediate star formation, while hot-mode accretion preferentially builds a large, hot gas reservoir in the halo. Late-time star formation relies on reservoir gas accreted 2-8 Gyr prior. Thus, the reservoir allows the star formation rate to surpass the current overall gas accretion rate. Stellar feedback cycles gas from the interstellar medium back into the hot reservoir. Stronger feedback results in more gas cycling, gas removal in a galactic outflow and less star formation overall, enabling simulations to match the observed star formation history. For lower mass galaxies in particular, strong feedback can delay the star formation peak to z = 1-2 from the accretion peak at z = 2-4.
Free Keywords:methods: numerical; galaxies: evolution; galaxies: formation; cosmology: theory
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stu895
URL:http://cdsads.u-strasbg.fr/abs/2014MNRAS.442..732W
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