Gravitationally redshifted gamma rays and neutron star masses

Details Gravitationally redshifted gamma rays and neutron star masses Gravitationally redshifted gamma rays and neutron star masses

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216l..63b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 216, Sept. 1, 1977, p. L63-L65.

Astronomy and Astrophysics

Astrophysics

2

Gamma Rays, Gravitational Effects, Neutron Stars, Pulsars, Red Shift, Stellar Mass, Binary Stars, Crab Nebula, Equations Of State, Line Spectra, Stellar Models, X Ray Sources

Scientific paper

Gravitationally redshifted gamma-ray lines emitted from the surface of pulsars and compact X-ray sources are discussed as constraints on neutron-star masses. A recent tentatively identified line at 400 (+ or -1) keV in the direction of the Crab Nebula, presumably due to positron annihilation on the pulsar surface, gives a mass in the range from 1.3 to 1.94 solar masses for a wide range of recent equations of state. The possibility of further restricting this range using gamma-ray spectroscopy of compact X-ray sources in close binary systems is suggested, and its possible importance in eliminating some models of neutron stars is discussed.

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