Redshifts derived from gamma-ray burst spectra are inconclusive

Details Redshifts derived from gamma-ray burst spectra are inconclusive Redshifts derived from gamma-ray burst spectra are inconclusive

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336..367k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 1, 1989, p. 367-375.

Astronomy and Astrophysics

Astrophysics

8

Gamma Ray Bursts, Neutron Stars, Positron Annihilation, Red Shift, Annihilation Reactions, Emission Spectra, Line Spectra, Stellar Magnetic Fields, Stellar Rotation, Thermal Plasmas

Scientific paper

If the reported large widths of the 'annihilation' features in gamma-ray burst spectra are real, the inferred value of the redshift can be as high as z = 0.8, depending on the emission mechanism. A model is presented in which a broad annihilation line peaking at 400 keV corresponds to a Doppler blueshift of the emitting region of z = -0.3. The prevalent view that the observed line centers of burst annihilation features imply emission from the surface of a nonrotating neutron star is not supported by the available data. However, emission from rapidly rotating neutron stars is a viable possibility.

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