THE FIRST GALAXY FORMATION MODEL WITH THE TP-AGB: BASIC REVISION OF THE MASS-LUMINOSITY RELATION
Chiara Tonini
Obergurgl, December 13th 2009
in collaboration with Claudia Maraston, Daniel Thomas (ICG)Julien Devriendt, Joe Silk (University of Oxford)
GALICS: GALaxies In Cosmological Simulations
Hybrid model: N-body + SAM
Box size: 150 Mpc Number of particles: from z=35.59 Galactic mass:
Hatton et al. 2003 MNRAS 343, 75
THE GALAXY FORMATION MODEL
Semi-analytics
baryonic cooling onto disksmerger-driven morphology+secular evolutionstar formationfeedback from Snemetallicity evolutionAGN feedbackquenching of SF in satellitesdynamical friction, tidal strippingdust stellar populations spectra
Input stellar population models: M05 vs PEGASE
Maraston 2005 MNRAS 362, 799 (M05)
TP-AGB
Theoretical colour-magnitude relation: very red!
CT, Maraston, Devriendt, Thomas & Silk, 2009 MNRAS 396L 36T
Results
Theoretical mass-luminosity relation
CT, Maraston, Devriendt, Thomas & Silk, 2009 MNRAS 396L 36T
Results
at same stellar mass
Conselice et al. 2007
Results Theoretical K-band luminosity function
De Lucia & Blaizot 2007 Bower et al.
2006
Monaco et al.
2007 Menci et al.
2006 Cole et al. 2000 Baugh et al.
2005 M05PEGASE
TP-AGB
AGN FEEDBACK
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
Comparison with data: samples
7 nearly-passively evolving galaxies at 1.4<z<2.7 (sp)HUDF, singled out by BzK criterion, 4000A breakEarly-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
Excellent quality of photometry:
CT, Maraston, Thomas, Devriendt & Silk, arXiv:0910.0015, minor revs
Comparison with data at z=2 Colour-magnitude relation --> mass, age and luminosityNearly-passive galaxies, ages ~0.2-2 Gyr24 micron --> measured dust signal is low
CT, Maraston, Thomas, Devriendt & Silk, arXiv:0910.0015, minor revs
extinction curve: Calzetti
Stellar masses:
Model:
Star-forming galaxies
CT, Maraston, Thomas, Devriendt & Silk, arXiv:0910.0015, minor revs
extinction curve: Calzetti
Colour-magnitude relation
Comparison with data at z=2
Comparison with data at z=2 Star-forming galaxies, colour-magnitude relationOther effects than TP-AGB; nebular emission
CT, Maraston, Thomas, Devriendt & Silk, arXiv:0910.0015, minor revs
Colour-colour relation --> stellar populations
CT, Maraston, Thomas, Devriendt & Silk, arXiv:0910.0015, minor revs
Star-forming galaxies
Comparison with data at z=2
Conclusions
The model reproduces high redshift galaxy dataRed 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
“Red & Dead” galaxies are alive!!!
CT, Maraston, Thomas, Devriendt & Silk, arXiv:0910.0015, minor revs
