Three Lyα emitters at z ≈ 6: Early GMOS/gemini data from the GLARE project

Elizabeth R. Stanway, Karl Glazebrook, Andrew J. Bunker, Roberto G. Abraham, Isobel Hook, James Rhoads, Patrick J. McCarthy, Brian Boyle, Matthew Colless, David Crampton, Warrick Couch, Inger Jørgensen, Sangeeta Malhotra, Rick Murowinski, Kathy Roth, Sandra Savaglio, Zlatan Tsvetanov

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

Abstract

We report spectroscopic detection of three z ∼ 6 Lyα-emitting galaxies, in the vicinity of the Hubble Ultra Deep Field, from the early data of the Gemini Lyman Alpha at Reionisation Era (GLARE) project. Two objects, GLARE 3001 (z = 5.79) and GLARE 3011 (z = 5.94), are new detections and are fainter in z′ (z′AB = 26.37 and 27.15) than any Lyman break galaxy previously detected in Lyα. A third object, GLARE 1042 (z = 5.83), has previously been detected in line emission from the ground; we report here a new spectroscopic continuum detection. Gemini/GMOS-South spectra of these objects, obtained using nod and shuffle, are presented together with a discussion of their photometric properties. All three objects were selected for spectroscopy via the i-drop Lyman break technique, the two new detections from the GOODS version 1.0 imaging data. The red i′-z′ colors and high equivalent widths of these objects suggest a high-confidence z > 5 Lyα identification of the emission lines. This brings the total number of known z > 5 galaxies within 9′ of the Hubble Ultra Deep Field to four, of which three are at the same redshift (z = 5.8 within 2000 km s-1), suggesting the existence of a large-scale structure at this redshift.

Original languageEnglish (US)
Pages (from-to)L13-L16
JournalAstrophysical Journal
Volume604
Issue number1 II
DOIs
StatePublished - Mar 20 2004

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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