The most intense hard x -ray source in the confused region in Scorpius has been identified as 4U1700-37 ( = HD153919). Observations extending over three binary periods in 1978 September were carried out with the high energy x-ray spectrometer on OSO-8. The 3.4-day modulation is seen above 20 keV with the intensity during eclipse being consistent with zero flux. The photonnumber spectrum from 20 to 150 keV is well represented by a single power law with a photonnumber spectral index of -2.77 ± 0.35 or by a thermal bremsstrahlung spectrum with kT = 27 (+15,-7) keV. The counting rate above 20 keV outside of eclipse shows no evidence for the 96.8-min x -ray modulation previously reported at lower energies. Despite the difficulties that exist in reconciling both the lack of periodic modulation in the emitted x-radiation and the orbital dynamics of the system with our currently accepted theories of the evolution and physical properties of neutron stars, the observed properties of 4U 1700-37 are all consistent with the source being a spherically accreting neutron star rather than a black hole.
We describe ways in which one can test the idea that the temperature parameter relevant for the description of the thermal-like emission spectra observed in hadronic collisions is related to the very large transverse relative acceleration that occurs between projectile and target in the course of these collisions through k T = a/27r. As a consequence, the typical temperature should increase with a decrease in the typical impact parameter, and also significant fluctuations should occur in the temperature, on an event-byevent basis. We perform the first analysis of data to look for such fluctuations, and we find an indication that they are present in antiproton annihilation reactions.
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