GSH 90-28-17: a Possible Old Supernova Remnant

Abstract

GSH 90-28-17 is a high-latitude galactic HI supershell, identified in the HI supershell catalogs with a velocity of $v_{lsr}\sim -17$ \kms. We used the new Arecibo GALFA-HI survey data which have much higher resolution and sensitivity than what were previously available to re-examine the properties of the supershell. We derived a new distance of 400 pc for GSH 90-28-17 and suggested that it is related to the Lac OB1 association. The radius of GSH 90-28-17 is 66.0$\pm$3.5 pc. The HI mass of the shell is (3.1$\pm 0.1)\times 10^4$ M${}_{\odot }$. It has an age of $\sim 4.5$ Myr and a total kinetic energy of (8.2$\pm 0.3)\times 10^{48}$ ergs. We extracted radio continuum data for the GSH 90-28-17 region from the 408 MHz all-sky Survey and Bonn 1420 MHz survey, and filtered the diffuse background Galactic emission. A radio loop-like ridge is found to be associated with the HI shell at both frequencies, and shows a nonthermal origin with a TT-plot index of $\alpha$=-1.35$\pm$0.69. In addition, the pulsar J2307+2225 with a similar distance is found in the shell region. We conclude that GSH 90-28-17 is probably an old, type II supernova remnant in the solar neighborhood.

8 pages, 8 figures, accepted by MNRAS

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Cited by in corpus (2)

• Runaways and shells around the CMa OB1 association
• Impact of the external radiation field on the structure and evolution of supernova remnants