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Title:
Discovery of large radial velocities in the supernova remnant 3C 58
Authors:
Fesen, R. A.
Affiliation:
AA(NASA, Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Greenbelt, MD)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 270, July 15, 1983, p. L53-L57. (ApJL Homepage)
Publication Date:
07/1983
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CRAB NEBULA, RADIAL VELOCITY, SUPERNOVA REMNANTS, H LINES, INTERSTELLAR EXTINCTION, LIGHT EMISSION, LINE SPECTRA, VISIBLE SPECTRUM
DOI:
10.1086/184069
Bibliographic Code:
1983ApJ...270L..53F

Abstract

New spectroscopic observations of four filaments in 3C 58, three of which appear close to the remnant's radio center, are described. Observed line intensities and radial velocities are presented which indicate a high radial expansion velocity for the object and nearly zero radial velocities for filaments located along the remnant's edge. Large velocities are present nearer the remnant's center up to a maximum of about 900 km/s. These velocities strongly support the identification of 3C 58 as the remnant of the historical supernova seen in AD 1181. A crude estimate of the reddening of the object is made. The observed H-alpha/H-beta ratio of about six suggests only a modest amount of extinction. The object is unlikely to possess a mean expansion velocity of 10,000 km/s over 800 yr, and a previously estimated distance to the object of about 8 kpc is thus improbable.

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