THE FIRST GALAXY FORMATION MODEL WITH THE TPAGB

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THE FIRST GALAXY FORMATION MODEL WITH THE TP-AGB
SIMULATING RED GALAXIES IN THE YOUNG UNIVERSE
Unity of the Universe, July 1st 2009
Chiara Tonini
Marie Curie Excellent Grant UniMass (PI
Claudia Maraston)
in collaboration with Claudia Maraston, Daniel
Thomas (ICG) Julien Devriendt, Joe Silk
(University of Oxford)
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THE GALAXY FORMATION MODEL
GALICS
Hatton et al. 2003 MNRAS 343, 75
GALaxies In Cosmological Simulations
Hybrid model N-body SAM
Box size 150 Mpc
from z35.59
Number of particles
Galactic mass
Semi-analytics
baryonic cooling onto disks merger-driven
morphologysecular evolution star
formation feedback from Sne metallicity
evolution AGN feedback quenching of SF in
satellites dynamical friction, tidal
stripping dust stellar populations spectra
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Input stellar population models M05 vs PEGASE
TP-AGB
Maraston 2005 MNRAS 362, 799 (M05)
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Results
Theoretical colour-magnitude relation very red!
CT, Maraston, Devriendt, Thomas Silk, 2009
MNRAS 396L 36T
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Results
Theoretical mass-luminosity relation
CT, Maraston, Devriendt, Thomas Silk, 2009
MNRAS 396L 36T
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Results
Theoretical K-band luminosity function
De Lucia Blaizot 2007
The gap between the M05 (TP-AGB) and the PEGASE
(no TP-AGB) runs is comparable to the spread
induced by different recipes of AGN feedback
CT, Maraston, Thomas, Devriendt Silk, in
preparation
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Comparison with data samples
Excellent quality of photometry
7 nearly-passively evolving galaxies at 1.4ltzlt2.7
(sp)
HUDF, singled out by BzK criterion Early-type
morphology, not star-forming, not much dust, star
age 0.2-2 Gyr
Maraston et al. 2006 ApJ 652 85
95 star-forming galaxies at 1.7ltzlt2.3 (sp)
GOODS-S, singled out by BzK criterion
Dickinson et al., in preparation
CT, Maraston, Thomas, Devriendt Silk, in
preparation
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Comparison with data at z2
Colour-magnitude relation --gt mass, age and
luminosity Nearly-passive galaxies, ages 0.2-2
Gyr 24 micron --gt measured dust signal is low
CT, Maraston, Thomas, Devriendt Silk, in
preparation
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Comparison with data at z2
Star-forming galaxies
Colour-magnitude relation
CT, Maraston, Thomas, Devriendt Silk, in
preparation
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Comparison with data at z2
Star-forming galaxies
Colour-colour relation --gt stellar populations
CT, Maraston, Thomas, Devriendt Silk, in
preparation
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Conclusions
Red Dead galaxies are alive!!!
The model reproduces high redshift galaxy data
Red colours and high near-IR luminosities can be
reached in the models without invoking high ages,
large masses or large dust reddening both in
nearly-passive and star-forming galaxies
CT, Maraston, Thomas, Devriendt Silk, in
preparation
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