AGN feedback in ellipticals

Daniel ThomasUniversity of Portsmouth

from spectra and SEDs

Schawinski et al (2007, MNRAS, astro-ph/0709.3015)

Kevin Schawinski (Oxford)Marc Sarzi (Hertfordshire)Claudia Maraston (Portsmouth)Sugata Kaviraj (Oxford)Seok-Joo Joo (Yonsei)Sukyoung Yi (Yonsei)Joseph Silk (Oxford)

Daniel Thomas - AGN feedback in early-type galaxies

Downsizing

Nelan et al 2005; Bernardi et al 2006

Thomas et al 2005

Radio mode

De Lucia et al 2006

AGN feedback Quasar mode

Croton et al 2005

Daniel Thomas - AGN feedback in early-type galaxies

Requirements1. Large sample w/o bias against star formation or AGN

2. Emission line diagnostics

3. 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

Schawinski, Thomas et al, MNRAS, in press

MOSES 16,000 ellipticals 32,000 spirals 0.05<z<0.1, r < 16.8 3-d density estimator Emission line diagnostics Stellar populations

Daniel Thomas - AGN feedback in early-type galaxies

Separating star formation from AGN

Baldwin et al 1981; Kewley et al 2001; Kauffmann et al 2003

Star forming

Transition

Seyfert

LINER

Daniel Thomas - AGN feedback in early-type galaxies

AGN feedback in action

Schawinski et al (2007)

Star forming Transition Seyfert LINER Passive

Daniel Thomas - AGN feedback in early-type galaxies

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

Downsizingo Suppression of late star formation in ellipticalso AGN feedback in galaxy formation models

MOSESo Ellipticals from SDSSo Derive recent star formation historyo Inclusion of (Lick) absorption features helpso Use chemical evolution

Evidence for AGN feedback in ellipticalso Evolutionary sequence SF-AGN-quiescenceo Time span > 500 Myr