X-ray Spectral Variations in the Youngest Galactic Supernova Remnant G1.9+0.3

Details X-ray Spectral Variations in the Youngest Galactic Supernova Remnant G1.9+0.3 X-ray Spectral Variations in the Youngest Galactic Supernova Remnant G1.9+0.3

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348805r&link_type=abstract

American Astronomical Society, AAS Meeting #213, #488.05; Bulletin of the American Astronomical Society, Vol. 41, p.463

Astronomy and Astrophysics

Astronomy

Scientific paper

The recently discovered 100 yr old supernova remnant (SNR) G1.9+0.3 has a featureless X-ray spectrum attributed to synchrotron radiation. We report spatial analysis of a Chandra 50 ks observation, in conjunction with our recent VLA image at 4.9 GHz. The X-ray data show substantial spectral variations across the remnant, with power-law fits giving significantly flatter slopes in and near opposing extensions (``ears'') beyond the main shell, and steepest spectra in the interior. Spectral fits with a synchrotron model with cutoff (``srcut'') indicate a large spread in values of rolloff frequency, from 2.e17 Hz to 1.e19 Hz. The very high column density (N_H 6.e22 cm^-2) suggests that dust scattering is significant, and in fact we observe a faint dust scattered halo around G1.9+0.3. According to our detailed models, including the effects of scattering lowers the rolloff frequencies by a factor of several but does not change the relative ordering of flatter and steeper regions. The ``ears'' show almost no radio emission and may be due to preshock diffusion of electrons. This explanation would put a firm upper bound on any magnetic-field amplification. We discuss the significance of our results for models of the dependence of shock acceleration efficiency on the obliquity angle between shock velocity and upstream magnetic field.

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