Discovery of a galaxy at redshift 6.96 and its implications on galaxy formation era

Details Discovery of a galaxy at redshift 6.96 and its implications on galaxy formation era Discovery of a galaxy at redshift 6.96 and its implications on galaxy formation era

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20913206i&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #132.06; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We found a Lyman alpha emitter at redshift z=6.96 in the Subaru Deep Field. A SuprimeCam imaging survey with 15 hours total exposure through a narrowband filter (centered at 973nm with FWHM of 22nm) yielded 41, 533 objects down to NB973=24.9 at 5 sigma detection. Photometric comparison of their NB973 magnitudes with those in B, V, R, i’, and z’ bands resulted in isolating only two objects with significant excess in NB973 band. Follow-up FOCAS spectroscopy of the brighter object, IOK-1, showed a clear Lyman alpha emission with typical skewed profile at 968.2nm, indicating its redshift at z=6.964, thus making this object the most distant galaxy spectroscopically confirmed.
The number of detected Lyman alpha emitters at redshift 7 is only 1/6-1/3 of what we expected from the number density at redshift 6.6 in the same field. The decline of the number density of Lyman alpha emitters from redshift 5.7, through 6.6, to 7.0 appears to be a systematic feature and similar result was reported also from HST NICMOS imaging survey for candidate galaxies at z 7-8 by Bouwens and Illingworth (2006). These results imply 1) the cosmic re-ionization was not completed at z 7 and Lyman alpha photons were attenuated by remaining intergalactic neutral hydrogen and/or 2) the universe at z 7 was still too young to bring up massive luminous galaxies

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