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THE FIRST GALAXY FORMATION MODEL WITH THE TP-AGB: BASIC REVISION OF THE MASS-LUMINOSITY RELATION

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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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slide1

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)

slide2

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

slide3

Input stellar population models: M05 vs PEGASE

TP-AGB

Maraston 2005 MNRAS 362, 799 (M05)

slide4

Results

Theoretical colour-magnitude relation: very red!

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

slide5

Conselice et al. 2007

at same stellar mass

Results

Theoretical mass-luminosity relation

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

slide6

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

slide7

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

slide8

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

slide9

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

slide10

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

slide11

Comparison with data at z=2

Star-forming galaxies

Colour-colour relation --> stellar populations

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

slide12

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

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