AXIAL RATIO OF EDGE-ON SPIRAL GALAXIES AS A TEST FOR BRIGHT RADIO HALOS
Journal Article
·
· Astrophysical Journal Letters
- Physics Department, University of Richmond 28 Westhampton Way, Richmond, VA 23173 (United States)
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 and 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. (letters)
- OSTI ID:
- 22364455
- Journal Information:
- Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 799; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
Similar Records
Radio continuum morphology of spiral galaxies
Relationship between stellar population and radio continuum emission in spiral galaxies
Optical surface brightnesses and radio luminosities of galaxies
Journal Article
·
Wed Dec 31 23:00:00 EST 1975
· Annu. Rev. Astron. Astrophys.; (United States)
·
OSTI ID:7238457
Relationship between stellar population and radio continuum emission in spiral galaxies
Journal Article
·
Tue Mar 31 23:00:00 EST 1987
· Astrophys. J.; (United States)
·
OSTI ID:5869701
Optical surface brightnesses and radio luminosities of galaxies
Journal Article
·
Tue Mar 31 23:00:00 EST 1981
· Astrophysics (Engl. Transl.); (United States)
·
OSTI ID:5802905