Search results for "NGC 6946"

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8.4GHz VLBI observations of SN2004et in NGC6946

2007

We report on 8.4GHz Very Long Baseline Interferometry (VLBI) observations of the type II-P supernova SN2004et in the spiral galaxy NGC 6946, made on 20 February 2005 (151 days after explosion). The Very Large Array (VLA) flux density was 1.23$\pm$0.07 mJy, corresponding to an isotropic luminosity at 8.4GHz of (4.45$\pm$0.3)$\times10^{25}$ erg s$^{-1}$ Hz$^{-1}$ and a brightness temperature of (1.3$\pm$0.3)$\times10^{8}$ K. We also provide an improved source position, accurate to about 0.5 mas in each coordinate. The VLBI image shows a clear asymmetry. From model fitting of the size of the radio emission, we estimate a minimum expansion velocity of 15,700$\pm$2,000 km s$^{-1}$. This velocity…

media_common.quotation_subjectFOS: Physical sciencesIndividualAstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICAAstrophysicsAsymmetryLuminositylaw.inventionlawVery-long-baseline interferometryNGC 6946media_commonPhysicsSpiral galaxyImage (category theory)Astrophysics (astro-ph)Astronomy and AstrophysicsGalaxiesStars:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]SynchrotronSupernovaRadio continuumSupernovaeSpace and Planetary ScienceBrightness temperatureGalaxies ; Individual ; NGC 6946 ; Radio continuum ; Stars ; Supernovae ; SN 2004etUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogoniaSN 2004et:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]
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