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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
VLBI observations of the nearby type IIb supernova 2011dh
Astrophysical Journal, Volume 751, No. 2, Article 125, Year 2012
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Description
We report on phase-referenced very long baseline interferometry radio observations of the Type IIb supernova 2011dh, at times t = 83 days and 179 days after the explosion and at frequencies, respectively, of 22.2 and 8.4GHz. We detected SN 2011dh at both epochs. At the first epoch only an upper limit on SN 2011dh's angular size was obtained, but at the second epoch, we determine the angular radius of SN 2011dh's radio emission to be 0.25 ± 0.08 mas by fitting a spherical shell model directly to the visibility measurements. At a distance of 8.4Mpc, this angular radius corresponds to a time-averaged (since t = 0) expansion velocity of the forward shock of 21, 000 ± 7000kms -1. Our measured values of the radius of the emission region are in excellent agreement with those derived from fitting synchrotron self-absorbed models to the radio spectral energy distribution, providing strong confirmation for the latter method of estimating the radius. We find that SN 2011dh's radius evolves in a power-law fashion, with Rt 0.92 ± 0.10. © 2012. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Bietenholz, Michael F.
South Africa, Krugersdorp
Hartebeesthoek Radio Astronomy Observatory
Canada, Toronto
York University
Brunthaler, Andreas
Germany, Bonn
Max Planck Institute for Radio Astronomy
United States, Socorro
National Radio Astronomy Observatory Socorro
Soderberg, Alicia M.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Krauss, Miriam I.
United States, Socorro
National Radio Astronomy Observatory Socorro
Zauderer, Bevin Ashley
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Bartel, Norbert
Canada, Toronto
York University
Chomiuk, Laura B.
United States, Socorro
National Radio Astronomy Observatory Socorro
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Rupen, Michael P.
United States, Socorro
National Radio Astronomy Observatory Socorro
Statistics
Citations: 29
Authors: 8
Affiliations: 5
Identifiers
Doi:
10.1088/0004-637X/751/2/125
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Environmental