A New Observational Upper Limit to the Low Redshift Ionizing Background Radiation

Details A New Observational Upper Limit to the Low Redshift Ionizing Background Radiation A New Observational Upper Limit to the Low Redshift Ionizing Background Radiation

2001-07-27

arxiv.org/abs/astro-ph/0107534v1

Astrophysical Journal (Vol. 561, No. 2, November 10, 2001 issue)

Astronomy and Astrophysics

Astrophysics

46 pages including 9 figures (7 ps, 2 gif)

Scientific paper

10.1086/323205

We report a new Fabry-Perot search for Halpha emission from the intergalactic cloud HI 1225+01 in an attempt to measure the low redshift ionizing background radiation. We set a new 2 sigma upper limit on Halpha emission of 8 mR (5 x 10^{-20} ergs cm^{-2} s^{-1} arcsec^{-2}). Conversion of this limit to limits on the strength of the ionizing background requires knowledge of the ratio of the projected to total surface area of this cloud, which is uncertain. We discuss the plausible range of this ratio, and within this range find that the strength of the ionizing backround is in the lower range of, but consistent with, previous observational and theoretical estimates.

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