Computer Science – Databases
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1156..241m&link_type=abstract
THE LOCAL BUBBLE AND BEYOND II: Proceedings of the International Conference. AIP Conference Proceedings, Volume 1156, pp. 241-2
Computer Science
Databases
Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc., Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus, Mass Loss And Stellar Winds, Supernovae, Galactic Center, Bar, Circumnuclear Matter, And Bulge
Scientific paper
We present Suzaku observations of the North Polar Spur (NPS), a region of enhanced soft X-ray and radio emission projected above the plane of the Galaxy, likely produced by combined supernovae and stellar winds from the nearby Sco-Cen OB association. The exceptional sensitivity and spectral resolution of the Suzaku/XIS below 1 keV allow unprecedented probing of low-energy spectral lines, and we have detected highly-ionized nitrogen toward the NPS for the first time. The best-fit emission model implies a hot (kT~0.3 keV), CIE plasma with an enhanced nitrogen abundance ratio of N/O = 4.0-0.5+0.4 solar. This N abundance is best explained by enrichment from stellar material that has been processed by AGB stars undergoing the CNO cycle. Due to the time required to develop AGB stars, we conclude that this enhancement cannot be caused by the Sco-Cen OB association, but may result from a previous enrichment episode in the solar neighborhood.
Bautz Mark W.
Miller Eric D.
Tsunemi Hiroshi
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