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- W1664978369 abstract "A series of observations of the Galactic Center 511 keV electron‐positron annihilation line spanning a decade has begun to severely constrain theoretical ideas concerning the nature of the source. The fluxes reported range from (4.18±1.56)±10−3γ/cm2−s to less than 0.7±10−3γ/cm2−s (2σ upper limit). Data from high‐resolution germanium spectrometers show a narrow (1.6 keV;+0.9,−1.6 keV), unredshifted (E = 510.9±0.25 keV) emission feature which varies in intensity by a factor of up to three, in six months or less. The combined results show that, in addition to any possible spatially extended component, a significant fraction of the emission must come from one or a few sources with size r≲1018cm, temperature T≲105 K, and typical luminosity ≊1037 ergs s−1. Simple models indicate the mass M of any compact central object is M < 109M⊙. There is a strong need for continued monitoring of the variations of this source." @default.
- W1664978369 created "2016-06-24" @default.
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- W1664978369 date "1982-01-01" @default.
- W1664978369 modified "2023-09-25" @default.
- W1664978369 title "Observations of gamma-ray line emission from the Galactic Center region" @default.
- W1664978369 doi "https://doi.org/10.1063/1.33499" @default.
- W1664978369 hasPublicationYear "1982" @default.
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