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 Chiara Tonini Obergurgl, December 13th 2009 collaboration with udia Maraston, Daniel Thomas (ICG) ien Devriendt, Joe Silk (University of Oxford)
description
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. - PowerPoint PPT Presentation
Transcript of 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
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
