EDP Sciences
Free access
Volume 444, Number 3, December IV 2005
Page(s) 871 - 881
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20053831

A&A 444, 871-881 (2005)
DOI: 10.1051/0004-6361:20053831

Two new Perseus arm supernova remnants discovered in the Canadian Galactic Plane Survey

R. Kothes1, 2, B. Uyaniker1, 3 and R. I. Reid1

1  National Research Council of Canada, Herzberg Institute of Astrophysics, Dominion Radio Astrophysical Observatory, PO Box 248, Penticton, British Columbia, V2A 6J9, Canada
2  Department of Physics and Astronomy, The University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada
3  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
    e-mail: roland.kothes@nrc-cnrc.gc.ca

(Received 15 July 2005 / Accepted 24 August 2005)

We report the discovery of two new second-quadrant supernova remnants, G96.0+2.0 and G113.0+0.2, in the data of the Canadian Galactic Plane Survey. The two SNRs are residents of the Perseus spiral arm at distances of 4.0 kpc and 3.1 kpc, respectively. The distances were determined kinematically by associating the objects with neutral hydrogen and molecular material.

G96.0+2.0 is most likely located at the edge of a large stellar wind bubble with a systemic velocity of about -44 km s-1. It consists of a relatively bright shell where the shock is encountering the wall of $\ion{H}{i}$ and slowly fades away towards the interior of the stellar wind bubble. The visible part of the remnant has a diameter of about 30 pc and a radio spectral index of $\alpha \approx -0.66$ ( $S \sim \nu^\alpha$), indicating that it is a shell-type remnant in an early stage of development. The SNR is most likely the remnant of a type Ib/c supernova explosion.

G113.0+0.2 is located in an area of confusing thermal emission not far from the radio-bright supernova remnant Cassiopeia A. It has an unusual elongated structure consisting of a long polarized filament and a more complex head structure that is interacting with a small molecular cloud; it resides in a butterfly-shaped $\ion{H}{i}$ cavity, probably a stellar wind bubble. It is about 36 pc long and 15 pc wide at a position angle of $70\degr$ with the Galactic Plane. A pulsar with a relatively low period derivative, giving it a characteristic age of 10 million years, is located close to the centre of the radio continuum emission at a Perseus arm distance. Whether the pulsar is the result of the same supernova explosion that created G113.0+0.2 or if it was left behind by an earlier supernova that also shaped the stellar wind bubble remains uncertain.

Key words: ISM: individual objects: G113.0+0.2, G96.0+2.0 -- ISM: supernova remnants -- ISM: bubbles -- polarization

SIMBAD Objects

© ESO 2005