Global energetics: fossil memory (metals) vs ... - David Elbaz

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Galaxies J1 - David Elbaz Fond diffus extragalactique Page 18
IRAS : 57 cm The far infrared Universe: from Spitzer to Herschel ISO : 60 cm Spitzer : 85 cm Discovery of luminous IR galaxies, >90% of light in IR Dominate the bright-end of the luminosity function Mostly major mergers… NEW ISSUES HAVE APPEARED on galaxy formation/evolution: • violent vs quiescent star formation (SFR-M*,…): duty cycle ? • origin of the « IR downsizing » : internal/external ? • does the environment trigger or quench SF ? Or none ? • are the CIRB/metals-SFR-M*densities consistent ? Space density of LIRGs x70 at z~1 They dominate the SFR density at z>0.7 Extrapolation to far IR bulk of the IR background / LIRGs • Stacking in far IR resolve peak IR bkg • Increasing density LIRGs/ULIRGs up to z~2 • Large Sp fraction • Trace large-scale structures in formation • identify missing Compton Thick AGN Herschel: 350 cm David Elbaz 19
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Page 3 and 4: En réalité les « métaux » sont
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Global energetics: fossil memory (metals) vs ... - David Elbaz

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