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Title:
The Expansion of the X-ray Remnant of Tycho's Supernova (SN 1572)
Authors:
Hughes, John P.
Affiliation:
AA(Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019 )
Publication:
The Astrophysical Journal, Volume 545, Issue 1, pp. L53-L56. (ApJL Homepage)
Publication Date:
12/2000
Origin:
UCP
ApJ Keywords:
ISM: individual (Tycho's Supernova), Shock Waves, ISM: Supernova Remnants, X-Rays: ISM
DOI:
10.1086/317337
Bibliographic Code:
2000ApJ...545L..53H

Abstract

Two ROSAT high-resolution images separated by nearly 5 years have been used to determine the expansion of the X-ray remnant of Tycho's supernova (SN 1572). The current expansion rate averaged over the entire remnant is 0.124%+/-0.011% yr-1, which, when combined with the known age of the remnant, determines the mean expansion parameter m, defined as R~tm, to be 0.54+/-0.05. There are significant radial and azimuthal variations of the X-ray expansion rate. The radial expansion in particular shows highly significant evidence for the more rapid expansion of the forward blast wave as compared to the reverse-shocked ejecta, an effect that has not been seen previously. The expansion parameter varies from m=0.71+/-0.06 at the outermost edge of Tycho's supernova remnant (SNR) to a value of m=0.34+/-0.10 on the inside edge of the bright rim of emission. These values are consistent with the rates expected for a remnant with constant density ejecta evolving into a uniform interstellar medium during the ejecta-dominated phase of evolution. Based on the size, age, and X-ray expansion rates, I obtain values for the explosion energy and ambient density of E~(4-5)×1050 ergs and n0~0.3-0.6 cm-3. As is also the case for Cas A and Kepler's SNR, the X-ray expansion rate of Tycho's SNR appears to be significantly higher than the radio expansion rate. In the case of Tycho's SNR, however, the difference between radio and X-ray expansion rates is clearly associated with the motion of the forward shock.
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