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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The first VLBI image of the young, oxygen-rich supernova remnant in NGC 4449
Monthly Notices of the Royal Astronomical Society, Volume 409, No. 4, Year 2010
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Description
We report on sensitive 1.4-GHz VLBI radio observations of the unusually luminous supernova remnant SNR 4449-1 in the galaxy NGC 4449, which gave us the first well-resolved image of this object. The remnant's radio morphology consists of two approximately parallel bright ridges, suggesting similarities to the barrel shape seen for many older Galactic supernova remnants or possibly to SN 1987A. The angular extent of the remnant is 65 × 40 mas, corresponding to (3.7 × 2.3) × 1018-(D/3.8-Mpc) cm. We also present a new, high signal-to-noise ratio optical spectrum. By comparing the remnant's linear size to the maximum velocities measured from optical lines, as well as using constraints from historical images, we conclude that the supernova explosion occurred between -1905 and 1961, likely around 1940. The age of the remnant is therefore likely -70-yr. We find that SNR 4449-1's shock wave is likely still interacting with the circumstellar rather than interstellar medium. © 2010 The Authors. Journal compilation © 2010 RAS.
Authors & Co-Authors
Bietenholz, Michael F.
Canada, Toronto
York University
Saudi Arabia, Krugersdrop
Hartebeesthoek Radio Observatory
Bartel, Norbert
Canada, Toronto
York University
Milisavljevic, Danny
United States, Hanover
Dartmouth College
Fesen, Robert A.
United States, Hanover
Dartmouth College
Challis, Peter M.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Kirshner, Robert P.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Statistics
Citations: 14
Authors: 6
Affiliations: 4
Identifiers
Doi:
10.1111/j.1365-2966.2010.17402.x
ISSN:
00358711
e-ISSN:
13652966