Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..232..116t&link_type=abstract
Gamma-ray line astrophysics. AIP Conference Proceedings, Volume 232, pp. 116-122 (1991).
Astronomy and Astrophysics
Astrophysics
7
Gamma-Ray Sources, Gamma-Ray Bursts
Scientific paper
We report on measurements made during a balloon flight of the GRIS (Gamma-Ray Imaging Spectrometer) experiment over Alice Springs, Australia on 28-30 Oct. 1988. Two observations of the galactic plane were made at LII=0° and LII=335° of durations, 9.9 and 6.9 hr. respectively. 26Al gamma-ray line emission (1809 keV) was detected during both observations, although the latter was statistically marginal. For an assumed galactic longitude distribution similar to high-energy cosmic rays, the inferred fluxes at LII=0° are 4.2 (+1.9, -1.6)×10-4 cm-1 s-1 rad-1 (2.5 σ) and 5.4 (+2.9, -3.1)×10-4 cm-1 s-1 rad-1 (1.7 σ) for the two observations. The two observations are therefore consistent with the assumed high energy gamma-ray distribution, but they are consistent with other distributions as well. The marginal statistics of the observations combined with the broad field-of-view (40° effective FWHM) do not permit meaningful tests of the model distributions to be made. The data do, however, suggest that the 26Al emission is distributed over galactic longitude rather than confined to a point source.
Barthelmy Scott D.
Gehrels Neil
Leventhal Marvin
MacCallum Crawford
Teegarden Bonnard J.
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