Search for z~7 Ly-alpha emitters with Suprime-Cam at the Subaru Telescope

Abstract

We report a search for z=7 Ly-alpha emitters (LAEs) using a custom-made Narrow-Band filter, centered at 9755 Angstroms, with the instrument Suprime-Cam installed at the Subaru telescope. We observed two different fields and obtained two sample of 7 Ly-alpha emitters of which 4 are robust in each field. We are covering the luminosity range of 9.10^{42} - 2.10^{43} erg/s in comoving volumes of ~ 4.10^{5} and 4.3.10^{5} Mpc^{3}. From this result, we derived possible z~7 Ly-alpha luminosity functions for the full samples and for a subsample of 4 objects in each field. We do not observe, in each case, any strong evolution between the z=6.5 and z~7 Ly-alpha luminosity functions. Spectroscopic confirmation for these candidate samples is required to establish a definitive measure of the luminosity function at z~7.

accepted for publication in ApJ

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• The Ly$\alpha$ Luminosity Function and Cosmic Reionization at $z\sim$ 7.0: a Tale of Two LAGER Fields
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• First Spectroscopic Confirmations of z ~ 7.0 Lya Emitting Galaxies in the LAGER Survey
• Observing the first galaxies
• Connecting Faint End Slopes of the Lyman-$\alpha$ emitter and Lyman-break Galaxy Luminosity Functions
• Lyman Alpha and MgII as Probes of Galaxies and their Environments
• What do observations of the Lyman-alpha fraction tell us about reionization?
• A Search for z=7.3 Lyα Emitters behind Gravitationally Lensing Clusters
• Design for the First Narrowband Filter for the Dark Energy Camera: Optimizing the LAGER Survey for z ~ 7 Galaxies
• Subaru FOCAS survey of z=7-7.1 Lyα emitters: a test for z >~ 7 Lyα photometric luminosity functions
• Filter Induced Bias in Lyα Emitter Surveys: A Comparison Between Standard and Tunable Filters. Gran Telescopio Canarias Preliminary Results
• Lyman break and UV-selected galaxies at $z\sim 1$ I. Stellar populations from ALHAMBRA survey
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• A Ly-alpha nebula at z~3.3