Radio Spectra of three Supernova Remnants: G114.3+0.3, G116.5+1.1 and G116.9+0.2

Abstract

New images of the Supernova Remnants (SNRs) G114.3+0.3, G116.5+1.1 and G116.9+0.2 (CTB 1) are presented at 408 MHz from the Canadian Galactic Plane Survey (CGPS). We also use the 1420 MHz images from the CGPS to study their 408-1420 MHz spectral indices. The flux densities at 408 MHz and 1420 MHz, corrected for flux densities from compact sources within the SNRs, are 12$\pm$6 Jy and 9.8$\pm$0.8 Jy for G114.3+0.3, 15.0$\pm$1.5 Jy and 10.6$\pm$0.6 Jy for G116.5+1.1, 15.0$\pm$1.5 Jy and 8.1$\pm$0.4 Jy for G116.9+0.2. The integrated flux density-based spectral indices (S${}_{\nu }$$\propto$$\nu$${}^{-\alpha }$) are $\alpha$=0.16$\pm$0.41, 0.28$\pm$0.10 and 0.49$\pm$0.09 for G114.3+0.3, G116.5+1.1 and G116.9+0.2, respectively. Their T-T plot-based spectral indexes are 0.68$\pm$0.48, 0.28$\pm$0.15, and 0.48$\pm$0.04, in agreement with the integrated flux density-based spectral indices. New flux densities are derived at 2695 MHz which are significantly larger than previous values. The new 408, 1420 and 2695 MHz flux densities and published values at other frequencies, where images are not available, are fitted after correcting for contributions from compact sources, to derive their multi-frequency spectral indices.

10 pages, 4 figures, 6 tables

References in corpus (5)

• Distance of three Supernova Remnants from HI line observations in a complex region: G114.3+0.3, G116.5+1.1, and CTB 1 (G116.9+0.2)
• Radio Spectral Index Variations of the SNR HB3
• Radio Spectral Index Study of the SNRs OA184 and VRO42.05.01
• Radio observations and spectral index study of SNR G126.2+1.6
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