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

R. J. Weymann | Zendy; S. N. Vogel | Zendy; Sylvain Veilleux | Zendy; Harland W. Epps | Zendy

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

Author(s) -

R. J. Weymann,

S. N. Vogel,

Sylvain Veilleux,

Harland W. Epps

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/323205

Subject(s) - ionizing radiation , redshift , physics , background radiation , astrophysics , intergalactic travel , lyman limit , limit (mathematics) , radiation , range (aeronautics) , astronomy , galaxy , intergalactic medium , optics , nuclear physics , irradiation , materials science , mathematics , composite material , mathematical analysis

We report a new Fabry-Perot search for Halpha emission from the intergalacticcloud HI 1225+01 in an attempt to measure the low redshift ionizing backgroundradiation. We set a new 2 sigma upper limit on Halpha emission of 8 mR (5 x10^{-20} ergs cm^{-2} s^{-1} arcsec^{-2}). Conversion of this limit to limitson the strength of the ionizing background requires knowledge of the ratio ofthe projected to total surface area of this cloud, which is uncertain. Wediscuss the plausible range of this ratio, and within this range find that thestrength of the ionizing backround is in the lower range of, but consistentwith, previous observational and theoretical estimates.Comment: 46 pages including 9 figures (7 ps, 2 gif

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