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A Critical Examination Of Hypernova Remnant Candidates In M101. Ii. Ngc 5471b, C-Hr Chen, Y-H Chu, R Gruendl, S-P Lai, Qd Wang

Astronomy Department Faculty Publication Series

NGC 5471B has been suggested to contain a hypernova because of its extraordinarily bright X-ray emission. To assess its true nature, we have obtained high-resolution images in continuum bands and nebular lines with the Hubble Space Telescope, and high-dispersion long-slit spectra with the Kitt Peak National Observatory 4 m echelle spectrograph. The images reveal three supernova remnant (SNR) candidates in the giant H II region NGC 5471, the brightest one being the 77 × 60 pc shell in NGC 5471B. The Hα velocity profile of NGC 5471B can be decomposed into a narrow component (FWHM 41 km s^{-1 …}