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A Newly-Recognised Galactic Supernova Remnant with Shell-Type and Filled-Centre Features

Published online by Cambridge University Press:  12 April 2016

Peter J. Barnes  and
A.J. Turtle
Peter J. Barnes
Affiliation:
Astronomy Department, University of Illinois, 1011 West Springfield Ave., Urbana, Illinois 61801-3000, USA
A.J. Turtle
Affiliation:
School of Physics, University of Sydney, New South Wales 2006, Australia

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While the number of galactic supernova remnants (SNRs) now known is fairly large (>150), the subset among these that are known to resemble the Crab Nebula is still distressingly small, about 15 or so (Green, 1984). Thus any object that can be unambiguously included in this exclusive club forms a valuable addition to our knowledge of this class. We report here observations of a newly recognised nonthermal galactic object, G18.94-l.06, having all the hallmarks of the classical shell-type SNRs, while also appearing to have a filled-centre component located inside the shell. Among the known Crab-like remnants, about one third show this dual nature (Green, 1984). This diagnosis of G18.94-1.06 is supported mainly by the variations in spectral index α (Sν∝ να) across the source, as seen between the two observation frequencies, 408 MHz and 5.0 GHz.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 101: Supernova Remnants and the Interstellar Medium , 1988 , pp. 347 - 350
Copyright
Copyright © Cambridge University Press 1988

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