Vortical Amplification of the Magnetic Field at an Inward Shock of Supernova Remnant Cassiopeia A
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PhysRevLett.120.251101.pdf
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Univ Arizona, Dept Planetary SciUniv Arizona, Dept Astron
Issue Date
2018-06-21Metadata
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AMER PHYSICAL SOCCitation
Fraschetti, F., Katsuda, S., Sato, T., Jokipii, J. R., & Giacalone, J. (2018). Vortical Amplification of the Magnetic Field at an Inward Shock of Supernova Remnant Cassiopeia A. Physical Review Letters, 120(25), 251101. https://doi.org/10.1103/PhysRevLett.120.251101Journal
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© 2018 American Physical Society.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We present an interpretation of the time variability of the x-ray flux recently reported from a multiepoch campaign of 15 years of observations of the supernova remnant Cassiopeia A by Chandra. We show for the first time quantitatively that the [4.2-6] keV nonthermal flux increase up to 50% traces the growth of the magnetic field due to a vortical amplification mechanism at a reflection inward shock colliding with inner overdensities. The fast synchrotron cooling as compared with shock-acceleration time scale qualitatively supports the flux decrease.ISSN
0031-90071079-7114