New Deep X-ray and Radio Observations of G1.9+0.3

Details New Deep X-ray and Radio Observations of G1.9+0.3 New Deep X-ray and Radio Observations of G1.9+0.3

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe..20b&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

Physics

Supernova Remnants

Scientific paper

Chandra X-ray observations revealed G1.9+0.3 to be the youngest known Galactic supernova remnant (SNR), only ˜ 100 yr old. Subsequent observations with the Very Large Array (VLA) confirmed this discovery. Both X-ray and radio emission are produced by relativistic electrons, accelerated in shocks with extreme (up to 14,000 km s^{-1}) velocities, but their morphologies are strikingly different. A pronounced NE-SW radio asymmetry contrasts with a bipolar NW-SE X-ray emission that arises in shocks capable of accelerating electrons to ˜ 10-100 TeV energies. Harder X-rays correlate with systematically varying X-ray brightness along the remnant's periphery. This may be interpreted in terms of the magnetic field obliquity dependence of the cosmic-ray acceleration efficiency, but observations available until now have not allowed for distinguishing between models with radically different field geometries. These models also fail to explain the strong NE-SW radio asymmetry. We present new deep Chandra and VLA observations that allow us to examine spatial morphologies and spectra of G1.9+0.3 in much greater detail than previously possible. We discuss how these observations advance our knowledge of particle acceleration in very fast SNR shocks.

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