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X-Ray Measured Dynamics of Tycho's Supernova RemnantWe present X-ray proper-motion measurements of the forward shock and reverse-shocked ejecta in Tycho's supernova remnant, based on three sets of archival Chandra data taken in 2000, 2003, and 2007. We find that the proper motion of the edge of the remnant (i.e., the forward shock and protruding ejecta knots) varies from 0.''20 yr-1 (expansion index m = 0.33, where R = tm ) to 0.''40 yr-1 (m = 0.65) with azimuthal angle in 2000-2007 measurements, and 0.''14 yr-1 (m = 0.26) to 0.''40 yr-1 (m = 0.65) in 2003-2007 measurements. The azimuthal variation of the proper motion and the average expansion index of [approx]0.5 are consistent with those derived from radio observations. We also find proper motion and expansion index of the reverse-shocked ejecta to be 0.''21-0.''31 yr-1 and 0.43-0.64, respectively. From a comparison of the measured m-value with Type Ia supernova evolutionary models, we find a pre-shock ambient density around the remnant of [less, similar]0.2 cm-3.
Document ID
20100030131
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Katsuda, Satoru
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Petre, Robert
Hughes, John
Hwang, Una
Yamaguchi, Hiroya
Hayato, Asami
Mori, Koji
Tsunemi, Hiroshi
Date Acquired
August 25, 2013
Publication Date
February 1, 2010
Publication Information
Publication: The Astrophysical Journal
Volume: 709
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Report/Patent Number
GSFC.JA.4868.2011
Distribution Limits
Public
Copyright
Other

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