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Is the surface brightness spectrum of the coma cluster radio halo inverted

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dc.contributor.authorDennison, B.en
dc.contributor.departmentPhysicsen
dc.date.accessed2014-05-08en
dc.date.accessioned2014-05-14T17:03:34Zen
dc.date.available2014-05-14T17:03:34Zen
dc.date.issued1986-04en
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.en
dc.description.sponsorshipNSF INT 8412419, AST 811786en
dc.description.sponsorshipVirginia Techen
dc.description.sponsorshipOnsala Space Observatoryen
dc.description.sponsorshipFulbright Foundationen
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..251Den
dc.identifier.issn0004-6361en
dc.identifier.urihttp://hdl.handle.net/10919/48019en
dc.identifier.urlhttp://adsabs.harvard.edu/full/1986A%26A...159..251Den
dc.language.isoen_USen
dc.publisherEDP SCIENCESen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectastronomy & astrophysicsen
dc.titleIs the surface brightness spectrum of the coma cluster radio halo inverteden
dc.title.serialAstronomy & Astrophysicsen
dc.typeArticle - Refereeden

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