Discovery of a new faint radio SNR G108.2-0.6

Free access article

Issue		A&A Volume 465, Number 3, April III 2007


Page(s)		907 - 911
Section		Interstellar and circumstellar matter
DOI		http://dx.doi.org/10.1051/0004-6361:20066935

A&A 465, 907-911 (2007)
DOI: 10.1051/0004-6361:20066935

Discovery of a new faint radio SNR G108.2-0.6

W. W. Tian^{1, 2}, D. A. Leahy², and T. J. Foster³

¹ National Astronomical Observatories, CAS, Beijing 100012, PR China
e-mail: wtian@ucalgary.ca
² Department of Physics & Astronomy, University of Calgary, Calgary, Alberta T2N 1N4, Canada
³ Department of Physics & Astronomy, Brandon University, Brandon, Manitoba R7A 6A9, Canada

(Received 14 December 2006 / Accepted 23 January 2007)

Abstract
A new faint and large shell-type radio Supernova Remnant (SNR) G108.2-0.6 has been discovered in the Canadian Galactic Plane Survey (CGPS). The SNR shows an elliptical shell-type structure at 1420 MHz, and has a 408-1420 MHz TT-plot spectral index of $\alpha$ = -0.5 $\pm$ 0.1 ( $S_{\nu}$ $\propto$ $\nu$ $^{\alpha}$ ), typical of a shell-type SNR. The remnant's flux density at 1420 MHz is 6.6 $\pm$ 0.7 Jy, and at 408 MHz is 11.5 $\pm$ 1.2 Jy. Both of these are corrected for compact sources. An integrated spectral index of -0.45 $\pm$ 0.13 is determined. This new SNR has among the lowest surface brightness of any known remnants ( $\Sigma_{\rm 1\,GHz}$ = 2.4 $\times$ 10^-22 W m^-2 Hz^-1 sr^-1). 21 cm Stokes Q and U CGPS data (plus preliminary Effelsberg Q and U maps) show some suggestive features that correlate with total power. $\ion{H}{i}$ observations show structures associated with G108.2-0.6 in the radial velocity range -53 to -58 km s^-1, and indicate it is located in the Perseus arm shock at a distance of 3.2 $\pm$ 0.6 kpc. At this distance the diameter of G108.2-0.6 is 58 pc. IRAS maps (12, 25, 60 and 100 $\mu$ m) of the new SNR show rich infrared emission surrounding G108.2-0.6.

Key words: ISM: supernova remnants

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