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Enhanced SFR in galaxy pairs and mergers from IR-bright galaxies in GEMS

Enhanced SFR in galaxy pairs and mergers from IR-bright galaxies in GEMS. Aday Robaina Rapisarda (Yes, two surnames) Lago di Como, Italy 28-3-2007. Looking for mergers (nothing to do with the talk title). In the local universe, everybody agrees on their classifications. Random one.

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Enhanced SFR in galaxy pairs and mergers from IR-bright galaxies in GEMS

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  1. Enhanced SFR in galaxy pairs and mergers from IR-bright galaxies in GEMS Aday Robaina Rapisarda (Yes, two surnames) Lago di Como, Italy 28-3-2007

  2. Looking for mergers (nothing to do with the talk title) • In the local universe, everybody agrees on their classifications. Random one Antennae M101

  3. What about the far ones? Let’s say z>0.5

  4. Automatic Classifiers: Concentration and Asymmetry Early types (0<A<0.5) Late types (0.35<A<1.1)

  5. Strange guys A>0.7 • Automated classifiers designed to imitate human eye • Tested on close galaxy samples (Fried catalogue) • Work reasonably well on isolated galaxies, but…

  6. What about this? I don’t know and they don´t explain

  7. Enhanced Star Formation in Interactions (Approaching the end of the talk) Local universe High redshift Lambas et al. 2003 Lin et al. 2006

  8. GEMS Results • New statistical approach (no need for 2-point correlation function) • Clear enhancement in close pairs and mergers • Averaged SFR in pairs defined • Error bars minimized due to the new approach (not too bad compared with spectroscopic surveys) • Results will improve with the STAGES dataset

  9. Merger Fraction in 24μm Sample • Merger fraction clearly increases with TIR luminosity • 20% TIR luminosity in strong mergers • 30% TIR luminosity in interactions • Mergers 2.09 times brighter than “normal” pairs Rapid decline in the CSFH is not due to a merger evolution (more restrictive results than in Bell et al. 2005)

  10. Blue-Rose-Ring Galaxy • LIRG • Starburst • X-ray • Spectacular Morphology

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