NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T02:02:41 PDT
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For refcode 2015ApJ...799L..10S:
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Copyright by American Astronomical Society. Reproduced by permission
2015ApJ...799L..10S Axial Ratio of Edge-On Spiral Galaxies as a Test for Bright Radio Halos Singal, J.; Kogut, A.; Jones, E.; Dunlap, H. Abstract. We use surface brightness contour maps of nearby edge-on spiral galaxies to determine whether extended bright radio halos are common. In particular, we test a recent model of the spatial structure of the diffuse radio continuum by Subrahmanyan & Cowsik which posits that a substantial fraction of the observed high-latitude surface brightness originates from an extended Galactic halo of uniform emissivity. Measurements of the axial ratio of emission contours within a sample of normal spiral galaxies at 1500 MHz and below show no evidence for such a bright, extended radio halo. Either the Galaxy is atypical compared to nearby quiescent spirals or the bulk of the observed high-latitude emission does not originate from this type of extended halo. Key words: Galaxy: halo, radio continuum: galaxies
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