NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Flash photoionization of gamma-ray burst environmentsThe H-alpha line emission that a flash-photoionized region emits is calculated. Archival transients, as well as various theoretical predictions, suggest that there may be significant ionizing flux. The limits on the line flux which might be observable indicate that the density must be fairly high for the recombination radiation to be observable. The intense burst radiation is insufficient to melt the dust which will be present in such a dense medium. This dust may attenuate the observable line emission, but does not attenuate the ionizing radiation before it ionizes the neutral medium surrounding the burst source. The dust can also produce a light echo. If there are indeed gamma-ray bursts in dense clouds, then it is possible that the burst was triggered by Bondi-Hoyle accretion from the dense medium, although it is unlikely on statistical grounds that all bursts occur in clouds.
Document ID
19920040733
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Band, David L.
(California, University La Jolla, United States)
Hartmann, Dieter H.
(Clemson University SC, United States)
Date Acquired
August 15, 2013
Publication Date
February 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 386
ISSN: 0004-637X
Subject Category
Space Radiation
Funding Number(s)
CONTRACT_GRANT: NAS8-36081
CONTRACT_GRANT: NAG5-1578
Distribution Limits
Public
Copyright
Other
No Preview Available