IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Shock-Cloud Interaction and Particle Acceleration in the Southwestern Limb of SN 1006
Autor/es:
MICELI, M.; ACERO, F.; DUBNER, G.; DECOURCHELLE, A.; ORLANDO, S.; BOCCHINO, F.
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2014 vol. 782 p. 33 - 38
ISSN:
0004-637X
Resumen:
The supernova remnant SN 1006 is a powerful source of high-energy
particles and evolves in a relatively tenuous and uniform environment
despite interacting with an atomic cloud in its northwestern limb. The
X-ray image of SN 1006 reveals an indentation in the southwestern part
of the shock front and the H I maps show an isolated (southwestern)
cloud, having the same velocity as the northwestern cloud, whose
morphology fits perfectly in the indentation. We performed spatially
resolved spectral analysis of a set of small regions in the southwestern
nonthermal limb and studied the deep X-ray spectra obtained within the
XMM-Newton SN 1006 Large Program. We also analyzed archive H I data,
obtained by combining single-dish and interferometric observations. We
found that the best-fit value of N H derived from the X-ray
spectra significantly increases in regions corresponding to the
southwestern cloud, while the cutoff energy of the synchrotron emission
decreases. The N H variation corresponds perfectly with the H
I column density of the southwestern cloud, as measured from the radio
data. The decrease in the cutoff energy at the indentation clearly
reveals that the back side of the cloud is actually interacting with the
remnant. The southwestern limb therefore presents a unique combination
of efficient particle acceleration and high ambient density, thus being
the most promising region for γ-ray hadronic emission in SN 1006.
We estimate that such emission will be detectable with the Fermi
telescope within a few years.