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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00003630naa a2200397 4500
001oai:research.chalmers.se:f8f206ef-6ce1-4283-83fb-a495096ed58a
003SwePub
008171007s2011 | |||||||||||000 ||eng|
0247 a https://doi.org/10.1088/0004-637X/740/2/952 DOI
0247 a https://research.chalmers.se/publication/1476482 URI
040 a (SwePub)cth
041 a engb eng
042 9 SwePub
072 7a art2 swepub-publicationtype
072 7a ref2 swepub-contenttype
1001 a Batejat, Fabien,d 1979u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)em1fabat
2451 0a Resolution of the Compact Radio Continuum Sources in Arp220
264 1c 2011
338 a electronic2 rdacarrier
520 a 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.
650 7a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng
653 a ISM: supernova remnants
653 a galaxies: individual (Arp220)
653 a galaxies: starburst
7001 a Conway, John,d 1963u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)jconway
7001 a Hurley, Rossa,d 1981u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)rossa
7001 a Parra Barraza, Rodrigo,d 1974u European Southern Observatory Santiago4 aut0 (Swepub:cth)rodpar
7001 a Diamond, Philipu Commonwealth Scientific and Industrial Research Organisation (CSIRO)4 aut
7001 a Lonsdale, Colinu Massachusetts Institute of Technology (MIT)4 aut
7001 a Lonsdale, Carolu National Radio Astronomy Observatory4 aut
7102 a Chalmers tekniska högskolab European Southern Observatory Santiago4 org
7730 t Astrophysical Journalg 740:2q 740:2x 1538-4357x 0004-637X
8564 u http://publications.lib.chalmers.se/records/fulltext/local_147648.pdfx primaryx freey FULLTEXT
8564 8u https://doi.org/10.1088/0004-637X/740/2/95
8564 8u https://research.chalmers.se/publication/147648

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