The North Polar Spur: Detection of Highly-Ionized Nitrogen Emission with Suzaku

Details The North Polar Spur: Detection of Highly-Ionized Nitrogen Emission with Suzaku The North Polar Spur: Detection of Highly-Ionized Nitrogen Emission with Suzaku

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0103m&link_type=abstract

American Astronomical Society, HEAD meeting #9, #1.03; Bulletin of the American Astronomical Society, Vol. 38, p.329

Astronomy and Astrophysics

Astronomy

Scientific paper

The North Polar Spur (NPS) is a region of enhanced soft X-ray and radio emission projected above the plane of the Galaxy, likely produced by a series of supernovae and stellar winds from a nearby OB association. Knowledge of the relative chemical abundances and plasma conditions within the NPS would constrain its formation. We present observations of the NPS using the X-ray Imaging Spectrometer (XIS) aboard the Suzaku X-ray satellite. The exceptional sensitivity and spectral resolution of the XIS below 1 keV allow unprecedented probing of low-energy spectral lines, including CVI (0.37 keV) and NVII (0.50 keV), and we have detected highly-ionized nitrogen toward the NPS for the first time. The best-fit emission model implies a hot (kT ˜ 0.25-0.3 keV), CIE plasma with depleted abundances of less than 0.5 solar, but an enhanced nitrogen abundance (N/O ˜ 3-5 solar). The temperature and total thermal energy of the gas suggest heating by one or more supernovae, while the enhanced nitrogen abundance is best explained by enrichment from stellar material that has been processed by the CNO cycle. This work is supported by NASA grant NNG05GM92G and funding from the Japan Society for the Promotion of Science (JSPS).

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