BALLOON-BORNE MEASUREMENTS OF THE SN 1987A HARD X-RAY CONTINUUM

摘要

SN 1987A hard X-ray continuum spectra obtained on 1987 October 29, 1988 April 9-10, and 1988 November 11 from balloon-flight measurements are presented. The spectra, spanning the energy range from 25 keV to 300 keV, have been analyzed using a detector response matrix inversion technique that converts the spectra from counts s~(-1) cm~2 keV to photons s~(-1) cm~2 keV allowing direct comparison with theoretical models. The results indicate that the bulk of the ~(56)Co is mixed moderately through the inner regions of the supernova envelope but they do not preclude the mixing of a small amount of the ~(56)Co farther out into the envelope necessary to account for the observed ~(56)Co line fluxes. The effect of the ratio ~(57)Co to ~(56)Co on the 1988 November 11 continuum spectrum is discussed.