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The high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering

Pilipenko, S V; Kovalev, Y. Y.; Andrianov, A S; Bach, Uwe; Buttaccio, S; Cassaro, P; Cimo, G; Edwards, P. G.; Gawronski, M P; Gurvits, L I.; Hovatta, T; Jauncey, David

Description

The high brightness temperatures, Tb ≳ 1013 K, detected in several active galactic nuclei by RadioAstron space VLBI observations challenge theoretical limits. Refractive scattering by the interstellar medium may affect such measurements. We quantify the scattering properties and the sub-mas scale source parameters for the quasar B0529+483. Using RadioAstron correlated flux density measurements at 1.7, 4.8, and 22 GHz on projected baselines up to 240 000 km we find two characteristic angular...[Show more]

dc.contributor.authorPilipenko, S V
dc.contributor.authorKovalev, Y. Y.
dc.contributor.authorAndrianov, A S
dc.contributor.authorBach, Uwe
dc.contributor.authorButtaccio, S
dc.contributor.authorCassaro, P
dc.contributor.authorCimo, G
dc.contributor.authorEdwards, P. G.
dc.contributor.authorGawronski, M P
dc.contributor.authorGurvits, L I.
dc.contributor.authorHovatta, T
dc.contributor.authorJauncey, David
dc.date.accessioned2019-04-21T07:13:09Z
dc.date.available2019-04-21T07:13:09Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/160552
dc.description.abstractThe high brightness temperatures, Tb ≳ 1013 K, detected in several active galactic nuclei by RadioAstron space VLBI observations challenge theoretical limits. Refractive scattering by the interstellar medium may affect such measurements. We quantify the scattering properties and the sub-mas scale source parameters for the quasar B0529+483. Using RadioAstron correlated flux density measurements at 1.7, 4.8, and 22 GHz on projected baselines up to 240 000 km we find two characteristic angular scales in the quasar core, about 100 and 10 μas. Some indications of scattering substructure are found. Very high brightness temperatures, Tb ≥ 1013 K, are estimated at 4.8 and 22 GHz even taking into account the refractive scattering. Our findings suggest a clear dominance of the particle energy density over the magnetic field energy density in the core of this quasar.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherBlackwell Publishing Ltd
dc.rightsThe Authors
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleThe high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume474
dc.date.issued2018
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationu4485658xPUB2223
local.type.statusPublished Version
local.contributor.affiliationPilipenko, S V, Russian Academy of Sciences
local.contributor.affiliationKovalev, Y. Y., Astro Space Center of Lebedev Physical Institut
local.contributor.affiliationAndrianov, A S, Lebedev Physical Institute
local.contributor.affiliationBach, Uwe, Max Planck Institute for Radio Astronomy
local.contributor.affiliationButtaccio, S, National Institute for Astrophysics (INAF)
local.contributor.affiliationCassaro, P, National Institute for Astrophysics (INAF)
local.contributor.affiliationCimo, G, Netherlands Institute for Radio Astronomyu
local.contributor.affiliationEdwards, P. G., CSIRO Astronomy and Space Science
local.contributor.affiliationGawronski, M P, Nicolaus Copernicus University
local.contributor.affiliationGurvits, L I., Joint Institute for VLBI ERIC
local.contributor.affiliationHovatta, T, University of Turku
local.contributor.affiliationJauncey, David, College of Science, ANU
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage3523
local.bibliographicCitation.lastpage3534
local.identifier.doi10.1093/mnras/stx2991
local.identifier.absseo970101 - Expanding Knowledge in the Mathematical Sciences
dc.date.updated2019-03-12T07:33:21Z
local.identifier.scopusID2-s2.0-85040240019
local.identifier.thomsonID000424347900049
dcterms.accessRightsOpen Access
dc.provenanceJournal: Monthly Notices of the Royal Astronomical Society (ISSN: 0035-8711, ESSN: 1365-2966) RoMEO: This is a RoMEO green journal Paid OA: A paid open access option is available for this journal. Author's Pre-print: green tick author can archive pre-print (ie pre-refereeing) Author's Post-print: green tick author can archive post-print (ie final draft post-refereeing) Publisher's Version/PDF: green tick author can archive publisher's version/PDF
CollectionsANU Research Publications

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