Transcript seminario di fisica - Scuola Normale Superiore

SEMINARIO DI COSMOLOGIA
Giovedì 3 Marzo 2016
ore 12:00
Scuola Normale Superiore
Pisa
Aula Marie Curie
Giuseppe Murante
( INAF-Trieste Observatory)
terrà un seminario dal titolo:
“Simulating disk galaxies with a novel sub-grid
prescription ”
Abstract:
I will introduce the problem of numerical galaxy formation in a cosmological context, giving a short
review of the current state of the art. I will then show results of cosmological simulations of disk galaxies
where star formation and stellar feedback are described using our MUlti Phase Particle Integrator
(MUPPI) model. This description is based on a simple multi-phase model of the interstellar medium at
unresolved scales, where mass and energy flows among the components are explicitly followed by solving
a system of ordinary differential equations. Thermal energy from SNe is injected into the local hot phase,
so as to avoid that it is promptly radiated away. A kinetic feedback prescription generates the massive
outflows needed to avoid the over-production of stars. We obtain spiral galaxies with small bulge-overtotal stellar mass ratios, extended stellar and gas disks, flat rotation curves and realistic values of stellar
masses. Star formation rates follow the observed Schmidt-Kennicutt relation. Stars kinematically
belonging to the bulge form early, while disk stars show a clear inside-out formation pattern and mostly
form after redshift z=2. Results are found to be remarkably stable against resolution. I will then
shorty describe the application of our prescription to cosmological volumes, and the future developments
of our scheme.
Tutti gli interessati sono invitati a partecipare.
Classe di Scienze Matematiche e Naturali
Piazza dei Cavalieri, 7
56126 Pisa-Italy
tel: +39 050 509111
fax: +39 050 563513
29/02/2016