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dc.contributorVirginia Tech
dc.contributor.authorDennison, B.
dc.date.accessioned2014-05-14T17:03:34Z
dc.date.available2014-05-14T17:03:34Z
dc.date.issued1986-04
dc.identifier.citationDennison, B., "Is the surface brightness spectrum of the coma cluster radio halo inverted," A&A 159, 251-254 (1986). http://adsabs.harvard.edu/full/1986A%26A...159..251D
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/10919/48019
dc.description.abstractComparison of published maps of the Coma Cluster radio halo at 430 and 1400 MHz (Hanisch, 1980) reveals that the spectrum of the surface brightness is inverted or flat over most of the extent of the 1400 MHz diffuse emission. This is very unusual for a highly extended source thought to emit via the synchrotron mechanism. Various explanations are considered, including a relatively flat electron-energy spectrum, free-free emission, emission by numerous compact sources, as well as instrumental effects. Constraints provided by searches for the Sunyaev-Zel'dovich effect tend to disqualify explanations (including free-free emission) in which the flat surface brightness spectrum continues to microwave frequencies. Verification of the high surface brightness at 1400 MHz is required.
dc.description.sponsorshipNSF INT 8412419, AST 811786
dc.description.sponsorshipVirginia Tech
dc.description.sponsorshipOnsala Space Observatory
dc.description.sponsorshipFulbright Foundation
dc.language.isoen_US
dc.publisherEDP SCIENCES
dc.subjectastronomy & astrophysics
dc.titleIs the surface brightness spectrum of the coma cluster radio halo inverted
dc.typeArticle
dc.identifier.urlhttp://adsabs.harvard.edu/full/1986A%26A...159..251D
dc.date.accessed2014-05-08
dc.title.serialAstronomy & Astrophysics


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