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Home Search Quick Search Advanced Fulltext Browse Collections Persons My eDoc Session History Login Name: Password: Documentation Help Support Wiki Direct access to document ID:	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 The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.