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Abstract:

SN 1006 is the prototype of shell supernova remnants, in which non-thermal synchrotron emission dominates the X-ray spectrum. The non-thermal emission is due to the cosmic-ray electrons accelerated behind the blast wave. The X-ray synchrotron emission is due to the highest energy electrons, and is thus a tracer of the maximum energy electrons may reach behind a shock. We have put together all XMM-Newton observations to build a full map of SN 1006. The very low brightness above 2 keV in the interior indicates that the bright non-thermal limbs are polar caps rather than an equator. This implies that the ambient magnetic field runs southwest to northeast, along the Galactic plane. We used a combined VLA/Parkes radio map to anchor the spectrum at low energy, and model the spectra with synchrotron emission from a cut-off power-law electron distribution, plus a thermal component. We present radial and azimuthal profiles of the cut-off frequency. The cut-off frequency decreases steeply with radius towards the center and with position angle away from the maximum emission. The maximum energy reached by accelerated particles, as well as their number, must be higher at the bright limbs than elsewhere. This implies interesting constraints for acceleration at perpendicular shocks. Overall the XMM-Newton data is consistent with the model in which the magnetic field is amplified where acceleration is efficient.

Registro:

Documento: Artículo
Título:Geometry of the non-thermal emission in SN 1006: Azlmuthal variations of cosmic-ray acceleration
Autor:Rothenflug, R.; Ballet, J.; Dubner, G.; Giacani, E.; Decourchelle, A.; Ferrando, P.
Filiación:DSM/DAPNIA/SAp, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
IAFE, CC 67, Suc.28, (1428) Buenos Aires, Argentina
Palabras clave:Acceleration of particles; ISM: cosmic rays; ISM: supernova remnants; Magnetic fields; X-rays: individuals: SN 1006; Data reduction; Fourier transforms; Galaxies; Interferometers; Magnetic field effects; Mathematical models; Polynomials; Synchrotrons; X rays; Acceleration of particles; ISM:cosmic rays; ISM:supernova remnants; X-rays:individuals:SN 1006; Cosmic rays
Año:2004
Volumen:425
Número:1
Página de inicio:121
Página de fin:131
DOI: http://dx.doi.org/10.1051/0004-6361:20047104
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v425_n1_p121_Rothenflug

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Citas:

---------- APA ----------
Rothenflug, R., Ballet, J., Dubner, G., Giacani, E., Decourchelle, A. & Ferrando, P. (2004) . Geometry of the non-thermal emission in SN 1006: Azlmuthal variations of cosmic-ray acceleration. Astronomy and Astrophysics, 425(1), 121-131.
http://dx.doi.org/10.1051/0004-6361:20047104
---------- CHICAGO ----------
Rothenflug, R., Ballet, J., Dubner, G., Giacani, E., Decourchelle, A., Ferrando, P. "Geometry of the non-thermal emission in SN 1006: Azlmuthal variations of cosmic-ray acceleration" . Astronomy and Astrophysics 425, no. 1 (2004) : 121-131.
http://dx.doi.org/10.1051/0004-6361:20047104
---------- MLA ----------
Rothenflug, R., Ballet, J., Dubner, G., Giacani, E., Decourchelle, A., Ferrando, P. "Geometry of the non-thermal emission in SN 1006: Azlmuthal variations of cosmic-ray acceleration" . Astronomy and Astrophysics, vol. 425, no. 1, 2004, pp. 121-131.
http://dx.doi.org/10.1051/0004-6361:20047104
---------- VANCOUVER ----------
Rothenflug, R., Ballet, J., Dubner, G., Giacani, E., Decourchelle, A., Ferrando, P. Geometry of the non-thermal emission in SN 1006: Azlmuthal variations of cosmic-ray acceleration. Astron. Astrophys. 2004;425(1):121-131.
http://dx.doi.org/10.1051/0004-6361:20047104