We introduce the Making Galaxies in a Cosmological Context (MaGICC) program
of smoothed particle hydrodynamics (SPH) simulations. We describe a parameter
study of galaxy formation simulations of an L* galaxy that uses early stellar
feedback combined with supernova feedback to match the stellar mass--halo mass
relationship. While supernova feedback alone can reduce star formation enough
to match the stellar mass--halo mass relationship, the galaxy forms too many
stars before z=2 to match the evolution seen using abundance matching. Our
early stellar feedback is purely thermal and thus operates in a fundamentally
different way than radiation pressure. The main effect of our implementation of
early stellar feedback is to preheat the interstellar medium so that supernovae
can drive outflows. The stronger feedback reduces the star formation efficiency
beyond what supernovae alone can accomplish. As a result of the early stellar
feedback, simulations produce a disk galaxy with a flat rotation curve, an
exponential surface brightness profile that are also able to match a wide range
of disk scaling relationships. The disk forms from the inside-out with an
increasing exponential scale length as the galaxy evolves. Overall, early
stellar feedback helps to simulate galaxies that match observational results at
low and high redshifts.
Description
[1208.0002] Making Galaxies in a Cosmological Context: The Need for Early Stellar Feedback
%0 Generic
%1 stinson2012making
%A Stinson, G.
%A Brook, C.
%A Macciò, A. V.
%A Wadsley, J.
%A Quinn, T. R.
%A Couchman, H. M. P.
%D 2012
%K feedback galaxy simulation stellar
%T Making Galaxies in a Cosmological Context: The Need for Early Stellar
Feedback
%U http://arxiv.org/abs/1208.0002
%X We introduce the Making Galaxies in a Cosmological Context (MaGICC) program
of smoothed particle hydrodynamics (SPH) simulations. We describe a parameter
study of galaxy formation simulations of an L* galaxy that uses early stellar
feedback combined with supernova feedback to match the stellar mass--halo mass
relationship. While supernova feedback alone can reduce star formation enough
to match the stellar mass--halo mass relationship, the galaxy forms too many
stars before z=2 to match the evolution seen using abundance matching. Our
early stellar feedback is purely thermal and thus operates in a fundamentally
different way than radiation pressure. The main effect of our implementation of
early stellar feedback is to preheat the interstellar medium so that supernovae
can drive outflows. The stronger feedback reduces the star formation efficiency
beyond what supernovae alone can accomplish. As a result of the early stellar
feedback, simulations produce a disk galaxy with a flat rotation curve, an
exponential surface brightness profile that are also able to match a wide range
of disk scaling relationships. The disk forms from the inside-out with an
increasing exponential scale length as the galaxy evolves. Overall, early
stellar feedback helps to simulate galaxies that match observational results at
low and high redshifts.
@misc{stinson2012making,
abstract = {We introduce the Making Galaxies in a Cosmological Context (MaGICC) program
of smoothed particle hydrodynamics (SPH) simulations. We describe a parameter
study of galaxy formation simulations of an L* galaxy that uses early stellar
feedback combined with supernova feedback to match the stellar mass--halo mass
relationship. While supernova feedback alone can reduce star formation enough
to match the stellar mass--halo mass relationship, the galaxy forms too many
stars before z=2 to match the evolution seen using abundance matching. Our
early stellar feedback is purely thermal and thus operates in a fundamentally
different way than radiation pressure. The main effect of our implementation of
early stellar feedback is to preheat the interstellar medium so that supernovae
can drive outflows. The stronger feedback reduces the star formation efficiency
beyond what supernovae alone can accomplish. As a result of the early stellar
feedback, simulations produce a disk galaxy with a flat rotation curve, an
exponential surface brightness profile that are also able to match a wide range
of disk scaling relationships. The disk forms from the inside-out with an
increasing exponential scale length as the galaxy evolves. Overall, early
stellar feedback helps to simulate galaxies that match observational results at
low and high redshifts.},
added-at = {2012-08-02T08:56:18.000+0200},
author = {Stinson, G. and Brook, C. and Macciò, A. V. and Wadsley, J. and Quinn, T. R. and Couchman, H. M. P.},
biburl = {https://www.bibsonomy.org/bibtex/27121d724521642d3055b8e01ea83f374/miki},
description = {[1208.0002] Making Galaxies in a Cosmological Context: The Need for Early Stellar Feedback},
interhash = {c9bfb28e58bd9b39c7da93bfce7be75a},
intrahash = {7121d724521642d3055b8e01ea83f374},
keywords = {feedback galaxy simulation stellar},
note = {cite arxiv:1208.0002Comment: Comments welcome; 12 pages, 11 figures, submitted MNRAS, movies at http://www.mpia.de/~stinson/magicc},
timestamp = {2012-08-02T08:56:18.000+0200},
title = {Making Galaxies in a Cosmological Context: The Need for Early Stellar
Feedback},
url = {http://arxiv.org/abs/1208.0002},
year = 2012
}