Vortical Amplification of the Magnetic Field at an Inward Shock of Supernova Remnant Cassiopeia A

F. Fraschetti, S. Katsuda, T. Sato, J. Randy Jokipii, Joe Giacalone

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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.

Original languageEnglish (US)
Article number251101
JournalPhysical Review Letters
Volume120
Issue number25
DOIs
StatePublished - Jun 21 2018

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Cassiopeia A
supernova remnants
shock
magnetic fields
synchrotrons
cooling
x rays

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Vortical Amplification of the Magnetic Field at an Inward Shock of Supernova Remnant Cassiopeia A. / Fraschetti, F.; Katsuda, S.; Sato, T.; Jokipii, J. Randy; Giacalone, Joe.

In: Physical Review Letters, Vol. 120, No. 25, 251101, 21.06.2018.

Research output: Contribution to journalArticle

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