Issue |
A&A
Volume 408, Number 1, September II 2003
|
|
---|---|---|
Page(s) | 187 - 192 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20030853 | |
Published online | 17 November 2003 |
G107.5-1.5, a new SNR discovered through its highly polarized radio emission
National Research Council of Canada, Herzberg Institute of Astrophysics, Dominion Radio Astrophysical Observatory, PO Box 248, Penticton, British Columbia, V2A 6J9, Canada
Department of Physics and Astronomy, The University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4 Canada
Corresponding author: roland.kothes@nrc-cnrc.gc.ca
Received:
12
March
2003
Accepted:
4
June
2003
A new highly polarized shell-type supernova remnant (SNR) has
been discovered in the Canadian Galactic Plane Survey (CGPS).
The only part of the remnant visible in radio continuum is a thin
shell segment sitting on top of diffuse emission. The curvature of this
segment indicates a much larger object which is not detectable in
our observations most likely due to an imhomogenous ambient medium.
A comparison
of 408 MHz and 1420 MHz continuum emission reveals a spectral index
of (
), typical for a shell-type
SNR. The polarized intensity averaged over the object is 50% of the
total intensity, and the peak fractional polarization is close to the theoretical
maximum, making this remnant the most highly polarized SNR known.
At the projected centre of the radio shell is the
unidentified X-ray point source 1RXS J225203.8+574249 which could
be the neutron star left behind by the supernova explosion or its pulsar
wind nebula. From the
low rotation measure and possibly related
features
a distance of about 1.1 kpc is proposed. At this distance
the radius of G107.5-1.5 is about 6 pc.
The morphology and the
structure of the ambient neutral
hydrogen around the SNR suggests that this supernova remnant is in a
late stage of evolution.
Key words: ISM: individual objects: G107.5-1.5 / ISM: supernova remnants / magnetic fields / polarization
© ESO, 2003
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