Searching for massive galaxy progenitors with GMASS (Galaxy Mass Assembly ultradeep Spectroscopic Survey) (a progress report) Andrea Cimatti (INAF-Arcetri) M. Bolzonella (INAF-Bologna), P. Cassata (INAF-Milano), E. Daddi (NOAO), M. Dickinson (NOAO), A. Franceschini (Uni-Padova), C. Halliday (INAF-Arcetri), J. Kurk (MPIA), C. Mancini (Uni-Firenze), M. Mignoli (INAF-Bologna), L. Pozzetti (INAF-Bologna), A. Renzini (INAF-Padova), G. Rodighiero (Uni- Padova), P. Rosati (ESO), G. Zamorani (INAF-Bologna)
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Searching for massive galaxy progenitors with GMASS (Galaxy Mass Assembly ultradeep Spectroscopic Survey) (a progress report) Andrea Cimatti (INAF-Arcetri)
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Searching for massive galaxy progenitors with
GMASS (Galaxy Mass Assembly ultradeep Spectroscopic Survey)
(a progress report)
Andrea Cimatti (INAF-Arcetri)
M. Bolzonella (INAF-Bologna), P. Cassata (INAF-Milano), E. Daddi (NOAO), M. Dickinson (NOAO), A. Franceschini (Uni-Padova), C. Halliday (INAF-Arcetri), J. Kurk (MPIA), C. Mancini (Uni-Firenze), M. Mignoli (INAF-Bologna), L. Pozzetti (INAF-Bologna), A. Renzini (INAF-Padova), G. Rodighiero (Uni-Padova), P. Rosati (ESO), G. Zamorani (INAF-Bologna)
z ~ 0 0 < z < 1 1 < z < 2
The emerging picture
“Downsizing” evolutionary pattern (Cowie et al. 1996)
(supported by several other results, e.g. FP, SSFR, …)
Thomas et al. 2005Bundy et al. 2006
Cimatti et al. 2004McCarthy et al. 2004Saracco et al. 2005Daddi et al. 2005
Passive or weakly star-formingOld stars (1-3 Gyr)Massive (log M_stars = 10.9 – 11.2 Msun, Chabrier IMF)Low levels of specific SFR Early-type morphology
Star-formingLow mass blue systems (log M_stars ~ 10 Msun)
Red systems with large mass (log M_stars ~ 11+)and strong star formation (50-100 Msun/yr)Red more because of age than dust extinctionHigh specific star formationSolar metallicity from UV photospheric features (Halliday et al.)Strong morphological K-correctionStar formation located mostly in outer regions
“Transition” phase leading to an old/massive ETG ?
Mid-Infrared colours: the bulk of the sources are consistent with a population of starbursts at z~2-3
Are we looking at a mixed population ?
Short summary
GMASS is designed to investigate the physical mechanisms leadingto the formation and mass assembly of massive early-type galaxies
In the redshift range of 1.5 < z < 3, GMASS is unveiling co-existingpopulations of old, passive, massive early-type galaxies up to z~2and massive starbursts probably experiencing their dominant phaseof star formation and mass assembly
Population of IRAC galaxies with no optical and sometimes near-IR counterparts: old systems + AGN at z>6 or extreme dusty starbursts ?
Have a look at Claire Halliday’s and Jaron Kurk’s posters and STAY TUNED !