Large Area Lyman Alpha survey: finding young galaxies at z=4.5

Details Large Area Lyman Alpha survey: finding young galaxies at z=4.5 Large Area Lyman Alpha survey: finding young galaxies at z=4.5

2001-02-08

arxiv.org/abs/astro-ph/0102140v1

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure, To appear in ``Gas and Galaxy Evolution,'' eds. J.E. Hibbard, M.P. Rupen, & J.H. van Gorkom, ASP Conference

Scientific paper

Strong Lyman-alpha emission is a signpost of young stars and the absence of dust and thus indicates young galaxies. To find such a population of young galaxies at z=4.5 we started the Large Area Lyman Alpha survey (LALA). This survey achieves an unprecedented combination of volume and sensitivity by using narrow-band filters on a large format (36x36 square-arcminutes) camera on the 4 meter telescope at KPNO. The volume density and star-formation contribution of the Lyman-alpha emitters at z=4.5 is comparable to that of Lyman break galaxies. With many candidates and a few spectroscopic confirmations in hand we discuss what the properties of Ly-alpha emitters imply for galaxy and star formation in the early universe.

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