Computer Science
Scientific paper
Aug 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970natur.227..582m&link_type=abstract
Nature, Volume 227, Issue 5258, pp. 582-583 (1970).
Computer Science
1
Scientific paper
MANY recent studies1-8 of the continuum spectra of discrete radio sources have provided examples of sources with ``opaque'' microwave spectra, in which the flux density has a maximum at a frequency greater than 3 GHz. At least two classes of object have such spectra: compact extragalactic sources, frequently identified3,6,9 with quasi-stellar objects or nuclei of galaxies, and galactic HII regions with high electron densities1. The extragalactic objects are thought to be sources of synchrotron radiation within which the relativistic plasma is opaque at microwave frequencies; some exhibit radio variability which can be explained by an expanding optically thick synchrotron source10. The galactic sources are thought to be optically thick emitters of bremsstrahlung radiation; a nonthermal mechanism11 has also been proposed for these objects. The source VRO 42.22.01 (BL Lac) may be an example of a third class characterized by rapid microwave variability. It is uncertain whether this object is a star with a faint diffuse envelope2 or an extragalactic source for which the line of sight is coincidentally close to the galactic plane.
Bridle Alan H.
MacDonell D. G.
No associations
LandOfFree
Opaque Radio Sources near the Galactic Equator does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Opaque Radio Sources near the Galactic Equator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Opaque Radio Sources near the Galactic Equator will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1851463