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The Origin of the Iron-Rich Knot in Tycho's Supernova RemnantX-ray observations of supernova remnants (SNRs) allow us to investigate the chemical inhomogeneity of ejecta, offering unique insight into the nucleosynthesis in supernova explosions. Here we present detailed imaging and spectroscopic studies of the Fe knot located along the eastern rim of the Type Ia SNR Tycho ( SN 1572) using Suzaku and Chandra long-exposure data. Surprisingly, the Suzaku spectrum of this knot shows no emission from Cr, Mn, or Ni, which is unusual for the Fe-rich regions in this SNR. Within the framework of the canonical delayed-detonation models for SN Ia, the observed mass ratios M(sub Cr)/M(sub Fe) is less than 0.023, M(sub Mn)/M(sub Fe) is less than 0.012, and M(sub Ni)/M(sub Fe) is less than 0.029 (at 90% confidence) can only be achieved for a peak temperature of (5.3 - 5.7) x 10(exp. 9) K and a neutron excess of approximately less than 2.0 x 10(exp. -3). These constraints rule out the deep, dense core of a Chandrasekhar-mass white dwarf as the origin of the Fe knot and favor either incomplete Si burning or an Alpha-rich freeze-out regime, probably close to the boundary. An explosive He burning regime is a possible alternative, although this hypothesis is in conflict with the main properties of this SNR.
Document ID
20170008470
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Yamaguchi, Hiroya
(Maryland Univ. College Park, MD, United States)
Hughes, John P.
(Rutgers Univ. Piscataway, NJ, United States)
Badenes, Carles
(Pittsburgh Univ. Pittsburgh, PA, United States)
Bravo, Eduardo
(Universidad Politecnica de Catalunya Catalunya, Spain)
Seitenzahl, Ivo R.
(Australian National Univ. Weston Creek, Australia)
Martinez-Rodriguez, Hector
(Pittsburgh Univ. Pittsburgh, PA, United States)
Park, Sangwook
(Texas Univ. Arlington, TX, United States)
Petre, Robert
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 5, 2017
Publication Date
January 9, 2017
Publication Information
Publication: The Astrophysical Journal
Publisher: The American Astronomical Society
Volume: 834
Issue: 2
ISSN: 0004-637X
e-ISSN: 1538-4357
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN45948
Funding Number(s)
CONTRACT_GRANT: GO5-16072A
CONTRACT_GRANT: NNX15AM03G
CONTRACT_GRANT: NNG17PT01A
Distribution Limits
Public
Copyright
Other
Keywords
ISM supernova remnants
ISM: individual objects

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