Radio Dispersion as a Diagnostic of Gamma-Ray Burst Distances

Details Radio Dispersion as a Diagnostic of Gamma-Ray Burst Distances Radio Dispersion as a Diagnostic of Gamma-Ray Burst Distances

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...417l..25p&link_type=abstract

Astrophysical Journal Letters v.417, p.L25

Astronomy and Astrophysics

Astronomy

30

Cosmology: Dark Matter, Gamma Rays: Bursts, Ism: General, Methods: Observational, Radiation Mechanisms: Miscellaneous

Scientific paper

If gamma-ray bursts sources emit even a small fraction of their energy in the radio spectrum, dispersion measurements of this emission would determine the distance to the source and thereby greatly constrain theoretical models. If a GRB is at z ~ 1, or is beyond the Galactic center and in the Galactic plane, the signal at low frequencies (~25 MHz) will be delayed by ~1 hr, which is enough time to allow a radio telescope to be pointed toward the GRB location. Such a measurement could detect a GRB with L_Radio_/Lgamma-ray_ >~ 10^-7^, while an observation at higher frequencies could detect a GRB with L_R/Lgamma >~ 10^-8^, both of which are much more sensitive than the current upper limit of L_R_/Lgamma <~ 10^-3.5^. A dispersion measurement for an extragalactic GRB would also observe for the first time the intergalactic plasma, which may be the dominant form of baryonic matter in the universe.

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