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  • Batejat, Fabien,1979Chalmers tekniska högskola,Chalmers University of Technology (author)

Resolution of the Compact Radio Continuum Sources in Arp220

  • Article/chapterEnglish2011

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  • 2011
  • electronicrdacarrier

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  • LIBRIS-ID:oai:research.chalmers.se:f8f206ef-6ce1-4283-83fb-a495096ed58a
  • https://doi.org/10.1088/0004-637X/740/2/95DOI
  • https://research.chalmers.se/publication/147648URI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • We 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 L ∝ D–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.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Conway, John,1963Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jconway (author)
  • Hurley, Rossa,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)rossa (author)
  • Parra Barraza, Rodrigo,1974European Southern Observatory Santiago(Swepub:cth)rodpar (author)
  • Diamond, PhilipCommonwealth Scientific and Industrial Research Organisation (CSIRO) (author)
  • Lonsdale, ColinMassachusetts Institute of Technology (MIT) (author)
  • Lonsdale, CarolNational Radio Astronomy Observatory (author)
  • Chalmers tekniska högskolaEuropean Southern Observatory Santiago (creator_code:org_t)

Related titles

  • In:Astrophysical Journal740:21538-43570004-637X

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