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Title:
A new look at the north Polar Spur
Authors:
Heiles, C.; Chu, Y.-H.; Troland, T. H.; Reynolds, R. J.; Yegingil, I.
Affiliation:
AA(California, University, Berkeley, Calif.), AB(California, University, Berkeley, Calif.), AC(California, University, Berkeley, Calif.), AD(Wisconsin, University, Madison, Wis.)
Publication:
Astrophysical Journal, Part 1, vol. 242, Dec. 1, 1980, p. 533-540. (ApJ Homepage)
Publication Date:
12/1980
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Interstellar Gas, Milky Way Galaxy, Nebulae, Radio Sources (Astronomy), Astronomical Models, Centimeter Waves, Gas Ionization, Supernova Remnants, X Ray Sources
DOI:
10.1086/158487
Bibliographic Code:
1980ApJ...242..533H

Abstract

The North Polar Spur (NPS) consists of the H I shell on the outside and the radio continuum shell RC NPS containing ionized gas and a region of diffuse X-ray enhancement. It was found that the parallel component of the magnetic field in the RC NPS is greater than 1.2 Gauss, and the electron density is below 0.4/cu cm. The ionization of the gas in RC NPS may be caused by hot stars inside the NPS or by X-ray emission; relativistic electrons are confined in Alfven waves by thy ionized gas. The model explains several features of the RC NPS including its forming only a portion of a complete loop adjacent to the H I NPS.

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