Optical Imaging and Spectroscopy of the Galactic Supernova Remnant 3C58

Details Optical Imaging and Spectroscopy of the Galactic Supernova Remnant 3C58 Optical Imaging and Spectroscopy of the Galactic Supernova Remnant 3C58

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915621f&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #156.21; Bulletin of the American Astronomical Society,

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Scientific paper

Results from a comprehensive imaging and spectroscopic survey of the optical emission knots associated with the Galactic supernova remnant
3C58 are presented. H-alpha images show hundreds of filaments and knots covering a nearly circular area roughly 400'' in diameter. Measured radial velocities of over 450 knots reveal two distinct kinematic populations; one with a peak expansion velocity of around 1100 km/s and the other expanding at less than 250 km/s. No intermediate velocity material is seen near the center of the remnant. The faster expanding population appears to form a thick shell of knots with an average velocity of 770 km/s and showing strong [N II] 6548,6583 relative to H-alpha suggesting N/H abundances several times that of solar. The slower population of knots shows generally lower
[N II]/H line ratios and likely represents circumstellar mass loss material from the 3C58 progenitor. Proper motion estimates using image data spanning a 28 yr time interval suggest positional shifts of between 0.5'' 2.0'' implying proper motions much less than the 0.2'' per yr expected if 3C58 was associated with SN 1181 as has been suggested.

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