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THE FIRST GALAXY FORMATION MODEL WITH THE TP-AGB: BASIC REVISION OF THE MASS-LUMINOSITY RELATION. Obergurgl, December 13th 2009. Chiara Tonini. in collaboration with Claudia Maraston, Daniel Thomas (ICG) Julien Devriendt, Joe Silk (University of Oxford). THE GALAXY FORMATION MODEL.

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The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

THE FIRST GALAXY FORMATION MODEL WITH THE TP-AGB:

BASIC REVISION OF THE

MASS-LUMINOSITY RELATION

Obergurgl, December 13th 2009

Chiara Tonini

in collaboration with

Claudia Maraston, Daniel Thomas (ICG)

Julien Devriendt, Joe Silk (University of Oxford)


The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

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 z=35.59

Number of particles:

Galactic mass:

Semi-analytics

baryonic cooling onto disks

merger-driven morphology+secular evolution

star formation

feedback from Sne

metallicity evolution

AGN feedback

quenching of SF in satellites

dynamical friction, tidal stripping

dust

stellar populations spectra


The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

Input stellar population models: M05 vs PEGASE

TP-AGB

Maraston 2005 MNRAS 362, 799 (M05)


The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

Results

Theoretical colour-magnitude relation: very red!

CT, Maraston, Devriendt, Thomas & Silk, 2009 MNRAS 396L 36T


The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

Conselice et al. 2007

at same stellar mass

Results

Theoretical mass-luminosity relation

CT, Maraston, Devriendt, Thomas & Silk, 2009 MNRAS 396L 36T


The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

Monaco et al. 2007

Bower et al. 2006

Menci et al. 2006

Cole et al. 2000

Baugh et al. 2005

M05

PEGASE

TP-AGB

AGN FEEDBACK

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, arXiv:0910.0015, minor revs


The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

Comparison with data: samples

Excellent quality of photometry:

7 nearly-passively evolving galaxies at 1.4<z<2.7 (sp)

HUDF, singled out by BzK criterion, 4000A break

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 1.7<z<2.3 (sp)

GOODS-S, singled out by BzK criterion

Dickinson et al., in preparation

CT, Maraston, Thomas, Devriendt & Silk, arXiv:0910.0015, minor revs


The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

Stellar masses:

Model:

extinction curve: Calzetti

Comparison with data at z=2

Colour-magnitude relation --> mass, age and luminosity

Nearly-passive galaxies, ages ~0.2-2 Gyr

24 micron --> measured dust signal is low

CT, Maraston, Thomas, Devriendt & Silk, arXiv:0910.0015, minor revs


The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

extinction curve: Calzetti

Comparison with data at z=2

Star-forming galaxies

Colour-magnitude relation

CT, Maraston, Thomas, Devriendt & Silk, arXiv:0910.0015, minor revs


The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

Comparison with data at z=2

Star-forming galaxies, colour-magnitude relation

Other effects than TP-AGB; nebular emission

CT, Maraston, Thomas, Devriendt & Silk, arXiv:0910.0015, minor revs


The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

Comparison with data at z=2

Star-forming galaxies

Colour-colour relation --> stellar populations

CT, Maraston, Thomas, Devriendt & Silk, arXiv:0910.0015, minor revs


The first galaxy formation model with the tp agb basic revision of the mass luminosity relation

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, arXiv:0910.0015, minor revs