Systematic Spatial Variations of the Spectrum of Synchrotron X-rays from the Youngest Galactic Supernova Remnant G1.9+0.3

Details Systematic Spatial Variations of the Spectrum of Synchrotron X-rays from the Youngest Galactic Supernova Remnant G1.9+0.3 Systematic Spatial Variations of the Spectrum of Synchrotron X-rays from the Youngest Galactic Supernova Remnant G1.9+0.3

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725613r&link_type=abstract

American Astronomical Society, AAS Meeting #217, #256.13; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The youngest Galactic supernova remnant G1.9+0.3 shows an X-ray spectrum dominated by synchrotron emission, with a simple bilaterally symmetric morphology resembling SN 1006. We observed G1.9+0.3 for 236 ks with Chandra in July 2009. We describe the nonthermal emission spectrum with a simple model of a power-law with exponential cutoff at energy Emax (XSPEC model srcut) and demonstrate systematic variations of the rolloff frequency (peak frequency emitted by electrons with Emax) with position. Extensions beyond the bright shell to E and W ("ears") have the highest values of rolloff (26 keV in the E and 12 in the W). Moving inward, spectra become softer, with a value of rolloff in the remnant interior of 0.6 keV, indicating a combination of synchrotron and adiabatic losses. The fainter quadrants of the X-ray shell have lower rolloff values. This pattern is similar to what is observed in SN 1006 and may indicate obliquity-dependence of the electron acceleration rate. We discuss the constraints on models of particle acceleration provided by these results, and by the observed brightening of the integrated X-ray flux (reported elsewhere) of about 3% per year.

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