Chanchaiworawit, K.; Guzmán, R.; Rodríguez Espinosa, J. M.; Castro-Rodríguez, N.; Salvador-Solé, E.; Calvi, R.; Gallego, J.; Herrero, A.; Manrique, A.; Marín-Franch, A.; Mas-Hesse, J. M.; Aretxaga, I.; Carrasco, E.; Terlevich, E.; Terlevich, R.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 469, Issue 3, p.2646-2661
Description
We present the results of our search near the end of the Reionization
Epoch for faint galaxies. This has been done using very deep OSIRIS
images obtained at the Gran Telescopio Canarias (GTC). Our observations
focus around two close, massive Lyman α emitters (LAEs) at
redshift 6.5, discovered in the SXDS field within a large-scale
overdense region. The total GTC observing time in three medium band
filters (F883w35, F913w25 and F941w33) is over 34 h covering 7.0 ×
8.5 arcmin2 (or ˜30 000 Mpc3 at z = 6.5). In
addition to the two spectroscopically confirmed LAEs in the field, we
have identified 45 other LAE candidates. The preliminary luminosity
function derived from our observations, assuming a spectroscopic
confirmation success rate of 2/3 as in previous surveys, suggests this
area is about 2 times denser than the general field galaxy population at
z = 6.5. If confirmed spectroscopically, our results will imply the
discovery of one of the earliest protoclusters in the Universe, which
will evolve to resemble the most massive galaxy clusters today.
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