期刊
ASTROPHYSICAL JOURNAL
卷 843, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa6dff
关键词
galaxies: evolution; galaxies: formation; galaxies: halos; hydrodynamics; methods: numerical
资金
- HST [AR-12836]
- NSF [AST-1412836, AST-1517491]
- NASA [NNX15AB22G]
- STScI grant [HST-AR-14293.001-A, HST-GO-14268.022-A]
- Spin(e) grant of the French Agence Nationale de la Recherche [ANR-13-BS05-0005]
- Alfred P. Sloan Research Fellowship
- NASA ATP Grant [NNX14AH35G]
- NSF Collaborative Research Grant [1411920]
- NSF CAREER grant [1455342]
- European Research Council under the European Community's Seventh Framework Programme (FP7) via the ERC Advanced Grant STARLIGHT: Formation of the First Stars [339177]
- BIS
- STFC
- Adrian Beecroft
- Oxford Martin School
- National Science Foundation [CNS-0958379, CNS-0855217, ACI-1126113]
- City University of New York High Performance Computing Center at the College of Staten Island
- GRTI grant [CT04AGR15001]
- Physics Division of the U.S. Army Research Office [64775-PH-REP]
- [HST-GO-14268.026-A]
- Direct For Mathematical & Physical Scien [1518291] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1153335] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [1518291] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1312888, 1412153] Funding Source: National Science Foundation
We investigate angular momentum acquisition in Milky Way-sized galaxies by comparing five high resolution zoom-in simulations, each implementing identical cosmological initial conditions but utilizing different hydrodynamic codes: Enzo, Art, Ramses, Arepo, and Gizmo-PSPH. Each code implements a distinct set of feedback and star formation prescriptions. We find that while many galaxy and halo properties vary between the different codes (and feedback prescriptions), there is qualitative agreement on the process of angular momentum acquisition in the galaxy's halo. In all simulations, cold filamentary gas accretion to the halo results in similar to 4 times more specific angular momentum in cold halo gas (lambda(cold.) greater than or similar to 0.1) than in the dark matter halo. At z > 1, this inflow takes the form of inspiraling cold streams that are co-directional in the halo of the galaxy and are fueled, aligned, and kinematically connected to filamentary gas infall along the cosmic web. Due to the qualitative agreement among disparate simulations, we conclude that the buildup of high angular momentum halo gas and the presence of these inspiraling cold streams are robust predictions of Lambda Cold Dark Matter galaxy formation, though the detailed morphology of these streams is significantly less certain. A growing body of observational evidence suggests that this process is borne out in the real universe.
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