IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Effects of supernova feedback on the formation of galaxy discs
Autor/es:
SCANNAPIECO, C; TISSERA, PATRICIA B.; WHITE, S. D. M; SPRINGEL, V.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
Blackwell publications
Referencias:
Año: 2008 vol. 389 p. 1137 - 1149
ISSN:
0035-8711
Resumen:
We use cosmological simulations in order to study the effects of
supernova (SN) feedback on the formation of a Milky Way-type galaxy of
virial mass ~1012h-1Msolar. We analyse
a set of simulations run with the code described by Scannapieco et al.,
where we have tested our star formation and feedback prescription using
isolated galaxy models. Here, we extend this work by simulating the
formation of a galaxy in its proper cosmological framework, focusing on
the ability of the model to form a disc-like structure in rotational
support. We find that SN feedback plays a fundamental role in the
evolution of the simulated galaxy, efficiently regulating the
star-formation activity, pressurizing the gas and generating mass-loaded
galactic winds. These processes affect several galactic properties such
as final stellar mass, morphology, angular momentum, chemical
properties, and final gas and baryon fractions. In particular, we find
that our model is able to reproduce extended disc components with high
specific angular momentum and a significant fraction of young stars. The
galaxies are also found to have significant spheroids composed almost
entirely of stars formed at early times. We find that most combinations
of the input parameters yield disc-like components, although with
different sizes and thicknesses, indicating that the code can form discs
without fine-tuning the implemented physics. We also show how our model
scales to smaller systems. By analysing simulations of virial masses
109 and 1010h-1Msolar, we
find that the smaller the galaxy, the stronger the SN feedback effects.