Diameter determinations of radio supernovae and the distance scale

  • Norbert Bartel
3. Radio Supernovae and Inference of Extragalactic Distance
Part of the Lecture Notes in Physics book series (LNP, volume 224)


A new method of determining extragalactic distances and inferring Ho is presented. The method combines the determinations of radial expansion velocities of supernovae via optical spectroscopy and the determinations of angular expansion velocities via Very Long Baseline Interfer ometry (VLBI). The data of two recent supernovae, SN 1979c in the galaxy M100 and SN 1980k in the galaxy NGC 6946, have been analyzed. We obtained an estimate of the distance, D, to M100 of 11.4αv ≲ D [Mpc] ≲ 24.4αv and a lower limit of the distance to NGC 6946 of D > 2.3αv [Mpc] with the factor av coupling the expansion velocities of the “radiosphere” and the photosphere and being most likely ≲ 1. These distances are equivalent to 100x,1' Ho [km s−1 Mpc−1] ≲ 40α v −1 and Ho < 230α v t-1 1 km s−1 Mpc−1 for the two measurements, respectively.


Expansion Velocity Brightness Distribution Angular Diameter Very Large Array Radio Radiation 
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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • Norbert Bartel
    • 1
  1. 1.Harvard-Smithsonian Center for AstrophysicsCambridgeUSA

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