A deep, narrow J-band search for proto-galactic Lyman Alpha emission at redshifts z~9

Astronomy and Astrophysics – Astrophysics

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11 pages, accepted MNRAS. Please note that the automatic postscript generation may result in a corrupted postscript file. Plea

Scientific paper

10.1111/j.1365-2966.2005.08755.x

We present a deep, narrow J-band search for proto--galactic Lyman Alpha emission at redshifts z~9. We combine an exceptionally deep image of the Hubble Deep Field South, obtained using a narrow band filter centred on the wavelength 1.187 microns using the VLT/ISAAC facility, with existing deep, broad band images covering optical to near infrared wavelengths. We search for z~9 Lyman Alpha emitting galaxies displaying a significant narrow band excess relative to the Js-band that are undetected at optical wavelengths. We detect no sources consistent with this criterion to the 90% point source flux limit of the NB image, F_{NB} = 3.28 x 10^{-18} ergs/s/cm2. The survey selection function indicates that we have sampled a volume of approximately 340 h^{-3} Mpc^3 to a Lyman Alpha emission luminosity of 10^{43} h^{-2} ergs/s. We conclude by considering the potential implications for the physics of the high--redshift universe.

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