The UV Ionizing Background at Z ~= 3 with the Keck Telescope

Details The UV Ionizing Background at Z ~= 3 with the Keck Telescope The UV Ionizing Background at Z ~= 3 with the Keck Telescope

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.598g&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

We describe a deep long-slit emission line search for redshifted Lyalpha at 2.7 < z < 4.1. We constrain the fluorescent Lyalpha emission from the Lyalpha forest clouds. The null results of our initial spectroscopy with Keck/LRIS place the strongest limit to date on the ambient flux of Lyman continuum photons at z = 3. Our 3 sigma upper bound on the mean intensity of the ionizing background at the Lyman limit is Jnu0 < 2 times 10 ^{-21} erg s^{-1} cm^{-2} Hz^{-1} sr^{-1}, assuming Lyman limit systems have typical radii of 70 kpc. We are currently undertaking deeper integrations to improve our sensitivity by a factor of three, which will reach the ionizing UV background expected due to the integrated light of known quasars at z ~= 3.

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