Three Lyman-alpha Emitters at z approx 6: Early GMOS/Gemini Data from the GLARE Project

Details Three Lyman-alpha Emitters at z approx 6: Early GMOS/Gemini Data from the GLARE Project Three Lyman-alpha Emitters at z approx 6: Early GMOS/Gemini Data from the GLARE Project

2003-12-17

arxiv.org/abs/astro-ph/0312459v2

Astrophys.J.604:L13-L16,2004

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures. Revised to match accepted version

Scientific paper

10.1086/383523

We report spectroscopic detection of three z~6 Lyman-alpha 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 Lyman-alpha. 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-S spectra of these objects, obtained using nod & 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 v1.0 imaging data. The red i'-z' colors and high equivalent widths of these objects suggest a high-confidence z>5 Lyman-alpha identification of the emission lines. This brings the total number of known z>5 galaxies within 9 arcmin of the Hubble Ultra Deep Field to four, of which three are at the same redshift (z=5.8 within 2000 km/s suggesting the existence of a large-scale structure at this redshift.

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