Journal Article

The first optical light from the supernova remnant G182.4+4.3 located in the Galactic anticentre region

A. Sezer, F. Gök and E. Aktekin

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 427, issue 2, pages 1168-1174
Published in print December 2012 | ISSN: 0035-8711
Published online December 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.22015.x
The first optical light from the supernova remnant G182.4+4.3 located in the Galactic anticentre region

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We report the discovery of optical filamentary and diffuse emission from G182.4+4.3 using the 1.5-m Russian—Turkish telescope. We present the optical CCD images obtained with the Hα filter, revealing the presence of mainly filamentary structure to the north-west and filamentary and diffuse structure in the centre, south and north regions of the remnant. The bright optical filaments located in the north-west and south regions are well correlated with the prominent radio shell of the remnant, strongly suggesting an association. From the flux-calibrated CCD imaging, the average [S ii]/Hα ratio is found to be ∼0.9 and ∼1.1 for south and north-west regions, respectively, which clearly indicates that the emission originates from shock-heated gas. We also present the results of X-ray data obtained from XMM—Newton, showing diffuse emission with a very low luminosity of ∼7.3 × 1031 erg s−1 at a distance of 3 kpc in the 0.3–10 keV energy band. Furthermore, we find a surprisingly low age of ∼4400 yr for this remnant, given its large radius of ∼22 pc.

Keywords: ISM: individual objects: G182.4+4.3; ISM: supernova remnants; X-rays: ISM

Journal Article.  3130 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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