Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4203s&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #42.03; Bulletin of the American Astronomical Society, Vol. 30, p.1311
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent observations of the Galactic Center region by the GRIS balloon-borne germanium spectrometer have determined that the diffuse 1.809 MeV emission resulting from the decay of (26) Al has an intrinsic width of 5.4 keV FWHM. This line width indicates that the (26) Al is either at a temperature of ~ 4.5x 10(8) K or it has a nonthermal velocity of ~ 500 km/s. Previous authors have suggested that for the (26) Al to remain at this large a velocity over its 10(6) year lifetime it must be trapped within dust grains in the ISM (see e.g. Naya et al. 1996, Chen et al. 1998). In this poster we discuss the results of our model for the initial acceleration of the (26) Al in dust grains as they exit their source, a Type II supernova, and their subsequent reacceleration in the ISM by ambient supernova remnant (SNR) shocks. Our results show that dust grains can be maintained at a velocity sufficient to explain the GRIS observation for ISM densities of ~ 0.2\ cm(-3) , dust grain sizes near 10(-5) cm, and distances between SNR shocks in the ISM of 100 - 200 pc.
Naya Juan E.
Sturner Steven J.
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