Seeking the Ultraviolet Ionizing Background at z~ 3 with the Keck Telescope

Details Seeking the Ultraviolet Ionizing Background at z~ 3 with the Keck Telescope Seeking the Ultraviolet Ionizing Background at z~ 3 with the Keck Telescope

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.6104b&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #61.04; Bulletin of the American Astronomical Society, Vol. 30, p.1336

Astronomy and Astrophysics

Astronomy

Scientific paper

We describe an ongoing experiment to search for the metagalactic Lyman-continuum background at z ~ 3. We are obtaining one of the deepest optical spectra ever, using Keck/LRIS to search for the fluorescent Ly-alpha emission from the population of clouds whose absorption produces the higher column density component of the Ly-alpha forest in quasar spectra (Lyman limit systems). Our preliminary study (Bunker, Marleau & Graham 1998, astro-ph/808111) placed a 3sigma upper bound on the mean intensity of the ionizing background at the Lyman limit of J_{nu0 } < 2x 10(-21) erg s(-1) cm(-2) Hz(-1) sr(-1) for 2.7

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