2003•The Astrophysical JournalOpen access

TheReuven Ramaty High Energy Solar Spectroscopic ImagerObservation of the 1809 keV Line from Galactic26Al

David M. Smith

Abstract

Observations of the central radian of the Galaxy by the Reuven Ramaty High Energy Solar Spectroscopic Imager ( RHESSI ) have yielded a high-resolution measurement of the 1809 keV line from 26 Al, detected at 11 σ significance in 9 months of data. The RHESSI result for the width of the cosmic line is 2.03 keV FWHM. The best-fit line width of 5.4 keV FWHM reported by Naya et al. using the Gamma-Ray Imaging Spectrometer balloon instrument is rejected with high confidence.

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Key concepts: Physics, Spectrometer, Full width at half maximum, Line (geometry), Astrophysics, Cosmic ray, Gamma ray, Resolution (logic)