Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..309j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 1, 1983, p. 309-319. Research supported by the California Space I
Astronomy and Astrophysics
Astronomy
8
Astrometry, Gamma Ray Astronomy, Gamma Ray Bursts, Radiation Sources, Astronomical Models, Diffuse Radiation, Distance
Scientific paper
The possibility of observable H-alpha produced by gamma-ray burst optical radiation reacting with a neutral hydrogen ambient medium is investigated. The ionization structure surrounding galactic bursts is determined by the hydrogen ionizing luminosity, LI, and geometric dilution when the ambient number density, NH is not greater than about 15 per cu cm. A model describing the H-alpha fluence is derived and evaluated for representative LI and NH. The predicted fluence histories and their accessibility to ground-based observations are discussed. Bursts with LI not less than 7 x 10 to the 37th ergs and distances Rs not greater than 500 pc may be observable several times per year, but the unknown relation between burst gamma-ray and optical luminosities makes rate estimation difficult. Optical bursts are classified into three groups based on the production of H-alpha flux within (group 1), in the vicinity of (group 2), or beyond (group 3) the total ionization zone radius, RI.
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