First Results from the Large Area Lyman Alpha Survey

Details First Results from the Large Area Lyman Alpha Survey First Results from the Large Area Lyman Alpha Survey

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.2105r&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #21.05; Bulletin of the American Astronomical Society, Vol. 31, p.1405

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Young galaxies undergoing their first burst of star formation are expected to have strong Lyman-α emission, due to low metallicity and dust content. However, studies to date have found comparatively small samples of such objects. We have embarked on a major project to obtain a statistically useful sample of several hundred Lyman-α emitters at z 4.5 (the Large Area Lyman Alpha, or LALA, survey). We are using the 8k x 8k CCD Mosaic camera at the Kitt Peak National Observatory 4m Mayall telescope. To date, we have surveyed a total volume of 1.3 x 106 comoving Mpc^3 (H_0 =70, \Omega_m =0.2, \Lambda=0) to 5 \sigma flux limits of (1.8 to 2.6) \times 10^{-17} erg/cm^2 /s. We are finding an emission line object density of 9 deg-2 Angstroms-1 with narrowband flux between 2.6 and 5.2 x 10-17 erg/cm2/ s at wavelength \lambda \simeq 6640 Angstroms. Our first spectroscopic followup with the Keck 10m telescope implies that \sim 1/3 to 1/2 of these are z\approx 4.5 Lyman-\alpha emitters, and that the density of Lyman-\alpha emitters in this restricted flux range is \sim 4000 deg^{-2} (unit z)^{-1}, or \sim 9\times 10^{-4} Mpc^{-3}$ for our assumed cosmology.

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