AGN feedback in ellipticals

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Presentation transcript:

AGN feedback in ellipticals from spectra and SEDs Kevin Schawinski (Oxford) Marc Sarzi (Hertfordshire) Claudia Maraston (Portsmouth) Sugata Kaviraj (Oxford) Seok-Joo Joo (Yonsei) Sukyoung Yi (Yonsei) Joseph Silk (Oxford) Daniel Thomas University of Portsmouth Schawinski et al (2007, MNRAS, astro-ph/0709.3015)

Downsizing De Lucia et al 2006 Thomas et al 2005 AGN feedback Quasar mode Croton et al 2005 Radio mode Nelan et al 2005; Bernardi et al 2006 Daniel Thomas - AGN feedback in early-type galaxies

Requirements Large sample w/o bias against star formation or AGN Emission line diagnostics Resolve recent star formation history TP-AGB Absorption indices Element ratio effects Eisenstein et al 2003 TMB Daniel Thomas - AGN feedback in early-type galaxies

MOrphologically Selected Ellipticals from SDSS MOSES 16,000 ellipticals 32,000 spirals 0.05<z<0.1, r < 16.8 3-d density estimator Emission line diagnostics Stellar populations Schawinski, Thomas et al, MNRAS, in press Daniel Thomas - AGN feedback in early-type galaxies

Separating star formation from AGN Star forming Transition Seyfert LINER Baldwin et al 1981; Kewley et al 2001; Kauffmann et al 2003 Daniel Thomas - AGN feedback in early-type galaxies

AGN feedback in action Star forming Transition Seyfert LINER Passive Schawinski et al (2007) Daniel Thomas - AGN feedback in early-type galaxies

Recent star formation history K. Schawinski (2007) Absorption indices help Daniel Thomas - AGN feedback in early-type galaxies

Evidence for evolutionary sequence Daniel Thomas - AGN feedback in early-type galaxies

The timeline of AGN feedback Daniel Thomas - AGN feedback in early-type galaxies

Implications for theory Springel et al 2005 Daniel Thomas - AGN feedback in early-type galaxies

Summary Downsizing Suppression of late star formation in ellipticals AGN feedback in galaxy formation models MOSES Ellipticals from SDSS Derive recent star formation history Inclusion of (Lick) absorption features helps Use chemical evolution Evidence for AGN feedback in ellipticals Evolutionary sequence SF-AGN-quiescence Time span > 500 Myr Daniel Thomas - AGN feedback in early-type galaxies