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dc.contributor.authorBatejat, Fabien
dc.contributor.authorConway, John E.
dc.contributor.authorHurley, Rossa
dc.contributor.authorParra, Rodrigo
dc.contributor.authorDiamond, Philip J.
dc.contributor.authorLonsdale, Colin John
dc.contributor.authorLonsdale, Carol J.
dc.date.accessioned2015-03-12T14:44:06Z
dc.date.available2015-03-12T14:44:06Z
dc.date.issued2011-10
dc.date.submitted2011-05
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.urihttp://hdl.handle.net/1721.1/95974
dc.description.abstractWe present 2 cm and 3.6 cm wavelength very long baseline interferometry images of the compact radio continuum sources in the nearby ultra-luminous infrared galaxy Arp220. Based on their radio spectra and variability properties, we confirm these sources to be a mixture of supernovae (SNe) and supernova remnants (SNRs). Of the 17 detected sources we resolve 7 at both wavelengths. The SNe generally only have upper size limits. In contrast all the SNRs are resolved with diameters ≥0.27 pc. This size limit is consistent with them having just entered their Sedov phase while embedded in an interstellar medium (ISM) of density 104 cm–3. These objects lie on the diameter-luminosity correlation for SNRs (and so also on the diameter-surface brightness relation) and extend these correlations to very small sources. The data are consistent with the relation LvpropD –9/4. Revised equipartition arguments adjusted to a magnetic field to a relativistic particle energy density ratio of 1% combined with a reasonable synchrotron-emitting volume filling factor of 10% give estimated magnetic field strengths in the SNR shells of ~15-50 mG. The SNR shell magnetic fields are unlikely to come from compression of ambient ISM fields and must instead be internally generated. We set an upper limit of 7 mG for the ISM magnetic field. The estimated energy in relativistic particles, 2%-20% of the explosion kinetic energy, is consistent with estimates from models that fit the IR-radio correlation in compact starburst galaxies.en_US
dc.description.sponsorshipEuropean Commission (EU Framework 6 Marie Curie Early Stage Training Programme under contract number MEST-CT-2005-19669 “ESTRELA.”)en_US
dc.description.sponsorshipSwedish Research Council (VR research grant)en_US
dc.language.isoen_US
dc.publisherInstitute of Physics/American Astronomical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1088/0004-637x/740/2/95en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceAmerican Astronomical Societyen_US
dc.titleRESOLUTION OF THE COMPACT RADIO CONTINUUM SOURCES IN Arp220en_US
dc.typeArticleen_US
dc.identifier.citationBatejat, Fabien, John E. Conway, Rossa Hurley, Rodrigo Parra, Philip J. Diamond, Colin J. Lonsdale, and Carol J. Lonsdale. “RESOLUTION OF THE COMPACT RADIO CONTINUUM SOURCES IN Arp220.” The Astrophysical Journal 740, no. 2 (October 4, 2011): 95. © 2011 American Astronomical Society.en_US
dc.contributor.departmentHaystack Observatoryen_US
dc.contributor.mitauthorLonsdale, Colin Johnen_US
dc.relation.journalAstrophysical Journalen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsBatejat, Fabien; Conway, John E.; Hurley, Rossa; Parra, Rodrigo; Diamond, Philip J.; Lonsdale, Colin J.; Lonsdale, Carol J.en_US
mit.licensePUBLISHER_POLICYen_US


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