Distance of Three Supernova Remnants from H I Line Observations in a Complex Region: G114.3+0.3, G116.5+1.1, and CTB?1 (G116.9+0.2)

摘要

We present new radio continuum and H I images toward the supernova remnants (SNRs) G114.3+0.3, G116.5+1.1, and G116.9+0.2 (CTB?1) taken from the Canadian Galactic Plane Survey (CGPS). We discuss the dynamics of their H I environment and a possible relationship of these SNRs with each other. We discovered patches of H I emission surrounding G114.3+0.3 indicating a location in the Local arm at a distance of about 700?pc, in contrast to previous publications, which proposed a Perseus arm location. The other two SNRs have radial velocities of -17?km s-1 (G116.5+1.1) and -27?km s-1 (CTB?1) according to related H I. However, the structure of the H I and its dynamics in velocity space suggest a possible relation between them, placing both remnants at a distance of about 1.6?kpc. CTB?1 appears to be embedded in an H I feature that is moving as a whole toward us with a velocity of about 10?km s-1. Furthermore, the off-centered location of CTB?1 in a large H I bubble indicates that the so-called breakout region of the remnant is in fact due to its expansion toward the low-density interior of this bubble. We believe that the progenitor star of CTB?1 was an early B- or O-type star shaping its environment with a strong stellar wind, in which case it exploded in a Ib or Ic event.