Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..380...11k&link_type=abstract
At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys ASP Conference Series, Vol. 380, proceedings o
Astronomy and Astrophysics
Astronomy
Scientific paper
We report our extensive search for Lyα emitters (LAEs) at z=6.5 in the Subaru Deep Field (SDF). We carried out spectroscopic observations with Subaru/Keck to identify LAEs that were selected by narrow-band excess at 920nm. Now we have 17 spectroscopically confirmed LAEs at z=6.5. Based on this spectroscopic sample, complemented by a photometric sample of 58 LAEs, we have derived a more accurate Lyα luminosity function (LF) of LAEs at z=6.5, which reveals an apparent deficit at the bright end, with L^* being ˜ 0.75 mag fainter than that observed at z=5.7. The difference has 3σ significance, which is reduced to 2σ when cosmic variance is taken into account. The decline of the Lyα LF implies the cosmic neutral fraction x_H I=0.45 based on a theoretical IGM model, although this predicted value is strongly model dependent.
The LF of the rest-frame UV continuum of the LAE sample at z=6.5, which is not sensitivive to the neutral IGM, is almost consistent with that of LAEs at z=5.7 and i-dropouts at z˜6, even at their bright ends. This result may imply that the reionization of the universe has not been completed at z=6.5.
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