Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..379...47o&link_type=abstract
Cosmic Frontiers ASP Conference Series, Vol. 379, proceedings of the conference held 31 July-4 August 2006 at Durham University,
Other
10
Scientific paper
Observational studies of z ≳ 6 galaxies are important to understand cosmic reionization and the early stage of galaxy formation. We present our recent results for z ≳ 6 galaxies found by Subaru surveys. The Lyα luminosity function (LF) of Ly α emitters (LAEs) evolves in Lyα luminosity from z=5.7 to 6.6. This evolution of Lyα LF is likely explained by the reionization of the Universe at z˜ 6, since the UV LF of LAEs does not change from z=5.7 to 6.6. On the other hand, bright dropout galaxies show a significant deficit at z˜ 6. The number density of dropouts continues to decrease probably up to z=7-8. It may be a hint for the hierarchical mass assembly of galaxies. We then introduce our on-going studies for z ≳ 7 galaxies with Subaru/Suprime-Cam and the new instrument, MOIRCS, which has unique capabilities in deep and wide-field near-infrared observations. These on-going studies will address the issues in reionization and galaxy formation with intrinsically-bright z ≳ 7 galaxies, which compliments the recent searches for high-z galaxies with gravitational lensing.
Ichikawa Takashi
Ouchi Masami
Shimasaku Kazuhiro
Tokoku Chihiro
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