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An X-Ray and Radio Study of the Varying Expansion Velocities in Tycho's Supernova RemnantWe present newly obtained X-ray and radio observations of Tycho's supernova remnant using Chandra and the Karl G. Jansky Very Large Array in 2015 and 2013/14, respectively. When combined with earlier epoch observations by these instruments, we now have time baselines for expansion measurements of the remnant of 12-15 years in the X-rays and 30 years in the radio. The remnant's large angular size allows for proper motion measurements at many locations around the periphery of the blast wave. Consistent with earlier measurements, we find a clear gradient in the expansion velocity of the remnant, despite its round shape. The proper motions on the western and southwestern sides of the remnant are about a factor of two higher than those in the east and northeast. We showed in an earlier work that this is related to an offset of the explosion site from the geometric center of the remnant due to a density gradient in the ISM, and using our refined measurements reported here, we find that this offset is approximately 23″ toward the northeast. An explosion center offset in such a circular remnant has implications for searches for progenitor companions in other remnants.
Document ID
20170002557
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Williams, Brian J.
(Space Telescope Science Inst. MD, United States)
Chomiuk, Laura
(Michigan State Univ. East Lansing, MI, United States)
Hewitt, John W.
(University of North Florida Jacksonville, FL, United States)
Blondin, John M.
(North Carolina State Univ. Raleigh, NC, United States)
Borkowski, Kazimierz J.
(North Carolina State Univ. Raleigh, NC, United States)
Ghavamian, Parviz
(Towson Univ. Towson, MD, United States)
Petre, Robert
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Reynolds, Stephen P.
(North Carolina State Univ. Raleigh, NC, United States)
Date Acquired
March 27, 2017
Publication Date
May 26, 2016
Publication Information
Publication: The Astrophysical Journal Letters
Publisher: The American Astronomical Society
Volume: 823
Issue: 2
ISSN: 0004-637X
e-ISSN: 1538-4357
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN40647
Funding Number(s)
WBS: WBS 662156
CONTRACT_GRANT: NAS8-03060
CONTRACT_GRANT: NAS5-03127
CONTRACT_GRANT: NSF AST-1412980
CONTRACT_GRANT: GO4-15074Z
Distribution Limits
Public
Copyright
Other
Keywords
dust
extinction - ISM; individual objects (Tycho SNR) ISM; supernova remnants

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