Abstract
Based on RATAN-600 21-cm line observations with an angular resolution of 2.4′ over a wide range of radial velocities, we analyze the neutral-hydrogen distribution in the region of the SNR G78.2+2.1. In addition to an H I shell at low radial velocities immediately surrounding the radio remnant, we detected an extended expanding H I shell, ≈3° in diameter, at a radial velocity of −25 km s−1, which closely coincides in coordinates and angular sizes with the outer X-ray shell discovered by Lozinskaya et al. (2000). The Hα emission studied by these authors in the SNR region also has a secondary peak at radial velocities from −45 to −20 km s−1. Since the radial velocities of these two objects differ significantly, their distances can be assumed to differ as well; i.e., a chance projection of two distinct objects is observed.
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Translated from Pis'ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 27, No. 4, 2001, pp. 272–278.
Original Russian Text Copyright © 2001 by Gosachinskij.
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Gosachinskij, I.V. H I distribution in the region of the supernova remnant G78.2+2.1. Astron. Lett. 27, 233–238 (2001). https://doi.org/10.1134/1.1358380
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DOI: https://doi.org/10.1134/1.1358380