Résumé / Abstract Seminaire_IAP
« Galaxies in the first billion years: the z = 6 - 12 Universe  »

James Dunlop
Royal Obs. Edinburgh (Edimbourg, Royaume-Uni)

The Hubble Space Telescope (HST) Ultra Deep Field 2012 (UDF12), Wide Field Camera 3 (WFC3) imaging was completed in late 2012, and provides the deepest ever imaging of the high-redshift Universe. By effectively doubling the depth of the Wide Field Camera 3 near-infrared imaging in the Hubble Ultra Deep Field, and providing imaging through an additional filter, these these new data hugely enhance our knowledge of the rest-frame UV properties of galaxies in the crucial redshift range z=7-10. I will present the key results from this programme, including the search for galaxies at z > 8.5, the best determination to date of the evolving galaxy luminosity function at z = 7 - 9, and the first unbiased measurements of the UV continuum slopes of galaxies at z=7 and z = 8. I will also compare these results with the predictions of the latest theoretical models of galaxy formation, and consider the implications for our understanding of cosmic reionization. Finally I will discuss planned deep ALMA mm observations of the HUDF, and briefly consider the prospects for further progress in our understanding of early galaxy formation with the new generation of near-infrared spectrographs, the James Webb Space telescope, and the E-ELT.
vendredi 18 octobre 2013 - 11:00
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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