AGN feedback in ellipticals from spectra and SEDs
AGN feedback in ellipticals from spectra and SEDs Daniel Thomas University of Portsmouth Kevin Schawinski (Oxford) Marc Sarzi (Hertfordshire) Claudia Maraston (Portsmouth) Sugata Kaviraj (Oxford) Seok-Joo (Yonsei) Sukyoung Yi (Yonsei) Joseph Silk (Oxford) Schawinski et al (2007, MNRAS, astro-ph/0709. 3015) Daniel Thomas - AGN feedback in early-type galaxies
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 1. Large sample w/o bias against star formation or AGN 2. Emission line diagnostics 3. Resolve recent star formation history Ø TP-AGB Ø Absorption indices Ø Element ratio effects TMB Daniel Thomas - AGN feedback in early-type galaxies Eisenstein et al 2003
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 Seyfert LINER Star Transition forming 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 Schawinski et al (2007) Daniel Thomas - AGN feedback in early-type galaxies LINER Passive
Recent star formation history K. Schawinski (2007) 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 ü Downsizing o Suppression of late star formation in ellipticals o AGN feedback in galaxy formation models ü MOSES o Ellipticals from SDSS o Derive recent star formation history o Inclusion of (Lick) absorption features helps o Use chemical evolution ü Evidence for AGN feedback in ellipticals o Evolutionary sequence SF-AGN-quiescence o Time span > 500 Myr Daniel Thomas - AGN feedback in early-type galaxies
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