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Resolution of the C...
Resolution of the Compact Radio Continuum Sources in Arp220
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- Batejat, Fabien, 1979 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Conway, John, 1963 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Hurley, Rossa, 1981 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Parra Barraza, Rodrigo, 1974 (author)
- European Southern Observatory Santiago
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- Diamond, Philip (author)
- Commonwealth Scientific and Industrial Research Organisation (CSIRO)
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- Lonsdale, Colin (author)
- Massachusetts Institute of Technology (MIT)
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- Lonsdale, Carol (author)
- National Radio Astronomy Observatory
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(creator_code:org_t)
- 2011
- 2011
- English.
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In: Astrophysical Journal. - 1538-4357 .- 0004-637X. ; 740:2
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Abstract
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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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- ISM: supernova remnants
- galaxies: individual (Arp220)
- galaxies: starburst
Publication and Content Type
- art (subject category)
- ref (subject category)
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Batejat, Fabien, ...
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Conway, John, 19 ...
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Hurley, Rossa, 1 ...
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Parra Barraza, R ...
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Diamond, Philip
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Lonsdale, Colin
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Lonsdale, Carol
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Astrophysical Jo ...
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Chalmers University of Technology