Migration of Nearby Spirals Tom Hughes AGN feedback or Environmental effects? Supervisors: Luca Cortese, Jonathan Davies astro-ph:0903.3574.

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Presentation transcript:

Migration of Nearby Spirals Tom Hughes AGN feedback or Environmental effects? Supervisors: Luca Cortese, Jonathan Davies astro-ph:

Migration of galaxies Blue Red What drives the migration? Borch et al, 2006 Wyder et al, 2007 Red Blue

AGN Feedback Martin et al, 2007 ESO/NASA/APEX But not well understood in spirals!

Environmental Effects Chung et al, 2007 H.Crowl T. Tal / J. Kenney

Herschel Reference Survey Mpc K sTot 12 mag b > +55 º A B < 0.2 Total sample of 454 galaxies (171 ETGs LTGs) Complete in NUV and H band imaging, HI 21cm, and optical spectroscopy ESA/AOES/HST

Colour-mass distribution Hughes & Cortese, MNRAS in press

Colour-mass distribution Hughes & Cortese, MNRAS in press

AGN-hosts and HI deficiency Hughes & Cortese, MNRAS in press Red circles: AGN Cyan circles: SF + AGN Green circles: HI Def > 0.5

High vs. low densities Migrating galaxies are mainly gas deficient, cluster spirals Hughes & Cortese, MNRAS in press

Red colour Low gas-fraction Some star-forming galaxies outside the blue sequence have normal Gas-fraction. No clear HI truncation. Different mechanisms at work? VIVA survey WHISP survey

Summary AGN feedback-quenching link can t be assumed from nuclear activity-colour correlation Migrating galaxies are mainly HI deficient, cluster spirals Environmental mechanisms appear responsible for driving migration Still need to understand evolution of red, gas- rich systems astro-ph: