Résumé / Abstract Seminaire_IAP
« Surveying the star-forming galaxy population at z ~ 1.6 in COSMOS with Subaru/FMOS »

John Silverman
Institute for the Physics and Mathematics of the Universe (IPMU) (Kashiwa, Japon)

The advent of multi-object near-infrared spectroscopic facilities is enabling large efforts to study the properties of high-redshift galaxies at the peak (z ~ 2) of the cosmic star-formation history of the Universe. We report on our effort to use the Fiber Multi-Object Spectrograph (FMOS) on Subaru to acquire the first sample reaching over one thousand galaxies with accurate redshifts from NIR spectra having a resolution (R~2000) that cleanly identifies key diagnostic emission lines (Halpha, Hbeta, [OIII], [NII]), typically used for studying the ISM of galaxies at low redshift. Based on this sample, we present results on their star formation rates that indicate a clear “main sequence”, chemical enrichment, ionization conditions and dust properties. With the multi-wavelength resources available in COSMOS and followup ALMA observations, we can also address whether outflows are driven by internal processes and how efficient gas is being converted into stars for galaxies with heightened star formation likely related to mergers. Finally, the high target density allows us to characterize their environments and detect the likely progenitors of nearby massive clusters.
vendredi 19 septembre 2014 - 11:00
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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