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H I Shells and Supershells in the I-GALFA H I 21 cm Line Survey. I. Fast-expanding H I Shells Associated with Supernova Remnants

  • Authors: G. Park, B.-C. Koo, S. J. Gibson, J.-h. Kang, D. C. Lane, K. A. Douglas, J. E. G. Peek, E. J. Korpela, C. Heiles, and J. H. Newton

Park et al. 2013 The Astrophysical Journal 777 14.

  • Provider: AAS Journals

Caption: Figure 3.

H i maps of the fast-expanding H i shells in four SNRs. The lower right corner of each panel gives the SNR name and velocity range for integration in km s −1. For W44, both positive- and negative-velocity H i emissions have been used, although the former dominates. The scale bar units are K km s −1. Red contours show the SNR morphology in 21 cm radio continuum, from the CGPS for CTB 80 and the VGPS for the others. Contour levels are written at the upper left corner of each panel in kelvins. The black solid circle in each plot shows the mean size of the SNR in radio continuum. Two dotted circles mark the annulus used for estimating the background emission in deriving the average profiles in Figure 1. The size of W51C is 48′, and other sizes are from Green's catalog. To aid comparison to literature studies in Equatorial coordinates, arrows are shown in each frame indicating right ascension and declination (J2000) coordinate directions.

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