Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21931107h&link_type=abstract
American Astronomical Society, AAS Meeting #219, #311.07
Mathematics
Logic
Scientific paper
Employing the hydrodynamics code Enzo, we perform adaptive mesh refinement (AMR) simulations to create and evolve a Milky-Way-mass disk galaxy in a larger cosmological environment. Using one set of initial conditions, we produce a series of runs where we systematically modify the star formation and stellar feedback models to investigate their effects on the dynamics of this galaxy by z = 0. Studying these results, we search for ways to avoid the spurious buildup of material in the core of the galaxy (i.e. the angular momentum problem) and for ways of producing realistic galactic outflows. The modifications made include: (i) spatial resolution, ranging from 1700 to 212 pc; (ii) an additional pressure component to ensure that the Jeans length is always resolved; (iii) low star formation efficiency, going down to 0.1%; (iv) fixed physical resolution as opposed to comoving resolution; (v) a supernova feedback model which injects thermal energy to the local cell; and (vi) a subgrid feedback model which suppresses cooling in the immediate vicinity of a star formation event. From these options, we find that only artificial cooling suppression has any impact on reducing the incidence of the angular momentum problem and producing a less-peaked rotation curve; however, even those runs which do not achieve flat rotation curves can produce outflows of metal-rich gas into the halo of this galactic system.
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