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Title: When Disorder Looks Like Order: A New Model to Explain Radial Magnetic Fields in Young Supernova Remnants

Abstract

Radial magnetic fields are observed in all known young, shell-type supernova remnants in our Galaxy, including Cas A, Tycho, Kepler, and SN1006, and yet the nature of these radial fields has not been thoroughly explored. Using a 3D model, we consider the existence and observational implications of an intrinsically radial field. We also present a new explanation of the origin of the radial pattern observed from polarization data as resulting from a selection effect due to the distribution of cosmic-ray electrons (CREs). We show that quasi-parallel acceleration can concentrate CREs at regions where the magnetic field is radial, making a completely turbulent field appear ordered, when it is in fact disordered. We discuss observational properties that may help distinguish between an intrinsically radial magnetic field and the case where it only appears radial due to the CRE distribution. We also show that the case of an intrinsically radial field with a quasi-perpendicular CRE acceleration mechanism has intriguing similarities to the observed polarization properties of SN1006.

Authors:
;  [1];  [2];  [3];  [4]
  1. Dunlap Institute for Astronomy and Astrophysics University of Toronto, Toronto, ON M5S 3H4 (Canada)
  2. CRESST, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  3. RIKEN, Astrophysical Big Bang Laboratory, Wako, Saitama-ken (Japan)
  4. Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2 (Canada)
Publication Date:
OSTI Identifier:
22654350
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 849; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; COSMIC RADIATION; DISTRIBUTION; GALAXIES; MAGNETIC FIELDS; POLARIZATION; SIMULATION; SUPERNOVA REMNANTS

Citation Formats

West, J. L., Gaensler, B. M., Jaffe, T., Ferrand, G., and Safi-Harb, S., E-mail: jennifer.west@dunlap.utoronto.ca. When Disorder Looks Like Order: A New Model to Explain Radial Magnetic Fields in Young Supernova Remnants. United States: N. p., 2017. Web. doi:10.3847/2041-8213/AA94C4.
West, J. L., Gaensler, B. M., Jaffe, T., Ferrand, G., & Safi-Harb, S., E-mail: jennifer.west@dunlap.utoronto.ca. When Disorder Looks Like Order: A New Model to Explain Radial Magnetic Fields in Young Supernova Remnants. United States. doi:10.3847/2041-8213/AA94C4.
West, J. L., Gaensler, B. M., Jaffe, T., Ferrand, G., and Safi-Harb, S., E-mail: jennifer.west@dunlap.utoronto.ca. Fri . "When Disorder Looks Like Order: A New Model to Explain Radial Magnetic Fields in Young Supernova Remnants". United States. doi:10.3847/2041-8213/AA94C4.
@article{osti_22654350,
title = {When Disorder Looks Like Order: A New Model to Explain Radial Magnetic Fields in Young Supernova Remnants},
author = {West, J. L. and Gaensler, B. M. and Jaffe, T. and Ferrand, G. and Safi-Harb, S., E-mail: jennifer.west@dunlap.utoronto.ca},
abstractNote = {Radial magnetic fields are observed in all known young, shell-type supernova remnants in our Galaxy, including Cas A, Tycho, Kepler, and SN1006, and yet the nature of these radial fields has not been thoroughly explored. Using a 3D model, we consider the existence and observational implications of an intrinsically radial field. We also present a new explanation of the origin of the radial pattern observed from polarization data as resulting from a selection effect due to the distribution of cosmic-ray electrons (CREs). We show that quasi-parallel acceleration can concentrate CREs at regions where the magnetic field is radial, making a completely turbulent field appear ordered, when it is in fact disordered. We discuss observational properties that may help distinguish between an intrinsically radial magnetic field and the case where it only appears radial due to the CRE distribution. We also show that the case of an intrinsically radial field with a quasi-perpendicular CRE acceleration mechanism has intriguing similarities to the observed polarization properties of SN1006.},
doi = {10.3847/2041-8213/AA94C4},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 849,
place = {United States},
year = {Fri Nov 10 00:00:00 EST 2017},
month = {Fri Nov 10 00:00:00 EST 2017}
}