HI Distribution in the Region of the Supernova Remnant G78.2+2.1

Details HI Distribution in the Region of the Supernova Remnant G78.2+2.1 HI Distribution in the Region of the Supernova Remnant G78.2+2.1

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001astl...27..233g&link_type=abstract

Astronomy Letters, vol. 27, p. 233-238 (2001)

Astronomy and Astrophysics

Astronomy

3

Supernovae, Supernova Remnants, Interaction With Medium

Scientific paper

Based on RATAN-600 21-cm line observations with an angular resolution of 2.4 arcmin 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 HI shell at low radial velocities immediately surrounding the radio remnant, we detected an extended expanding HI shell, approximately 3 deg in diameter, at a radial velocity of -25 km/s, which closely coincides in coordinates and angular sizes with the outer X-ray shell discovered by Lozinskaya et al. (2000). The H_alpha emission studied by these authors in the SNR region also has a secondary peak at radial velocities from -45 to -20 km/s. 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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