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Resolution of the C...
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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
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electronicrdacarrier
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LIBRIS-ID:oai:research.chalmers.se:f8f206ef-6ce1-4283-83fb-a495096ed58a
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https://doi.org/10.1088/0004-637X/740/2/95DOI
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https://research.chalmers.se/publication/147648URI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
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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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Conway, John,1963Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jconway
(author)
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Hurley, Rossa,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)rossa
(author)
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Parra Barraza, Rodrigo,1974European Southern Observatory Santiago(Swepub:cth)rodpar
(author)
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Diamond, PhilipCommonwealth Scientific and Industrial Research Organisation (CSIRO)
(author)
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Lonsdale, ColinMassachusetts Institute of Technology (MIT)
(author)
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Lonsdale, CarolNational Radio Astronomy Observatory
(author)
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Chalmers tekniska högskolaEuropean Southern Observatory Santiago
(creator_code:org_t)
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In:Astrophysical Journal740:21538-43570004-637X
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Conway, John, 19 ...
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