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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/112624
Gran Telescopio Canarias observations of an overdense region of Lyman α emitters at z = 6.5
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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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CHANCHAIWORAWIT, K., et al. Gran Telescopio Canarias observations of an overdense region of Lyman α emitters at z = 6.5. Monthly Notices of the Royal Astronomical Society. 2017. Vol. 469, num. 2646-2661. ISSN 0035-8711. [consulted: 14 of October of 2026]. Available at: https://hdl.handle.net/2445/112624