Sökning: onr:"swepub:oai:research.chalmers.se:f8f206ef-6ce1-4283-83fb-a495096ed58a" >
Resolution of the C...
Resolution of the Compact Radio Continuum Sources in Arp220
-
- Batejat, Fabien, 1979 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Conway, John, 1963 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Hurley, Rossa, 1981 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
-
visa fler...
-
- Parra Barraza, Rodrigo, 1974 (författare)
- European Southern Observatory Santiago
-
- Diamond, Philip (författare)
- Commonwealth Scientific and Industrial Research Organisation (CSIRO)
-
- Lonsdale, Colin (författare)
- Massachusetts Institute of Technology (MIT)
-
- Lonsdale, Carol (författare)
- National Radio Astronomy Observatory
-
visa färre...
-
(creator_code:org_t)
- 2011
- 2011
- Engelska.
-
Ingår i: Astrophysical Journal. - 1538-4357 .- 0004-637X. ; 740:2
- Relaterad länk:
-
http://publications.... (primary) (free)
-
visa fler...
-
https://doi.org/10.1...
-
https://research.cha...
-
visa färre...
Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- ISM: supernova remnants
- galaxies: individual (Arp220)
- galaxies: starburst
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas
- Av författaren/redakt...
-
Batejat, Fabien, ...
-
Conway, John, 19 ...
-
Hurley, Rossa, 1 ...
-
Parra Barraza, R ...
-
Diamond, Philip
-
Lonsdale, Colin
-
visa fler...
-
Lonsdale, Carol
-
visa färre...
- Om ämnet
-
- NATURVETENSKAP
-
NATURVETENSKAP
-
och Fysik
-
och Astronomi astrof ...
- Artiklar i publikationen
-
Astrophysical Jo ...
- Av lärosätet
-
Chalmers tekniska högskola