Expansion of the Youngest Galactic Supernova Remnant G1.9+0.3

Details Expansion of the Youngest Galactic Supernova Remnant G1.9+0.3 Expansion of the Youngest Galactic Supernova Remnant G1.9+0.3

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725612c&link_type=abstract

American Astronomical Society, AAS Meeting #217, #256.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Tracking the increase in size of supernova remnant G1.9+0.3, the remains of the most recent stellar explosion in our Galaxy, yields the approximate time since the original supernova. We calculate an average global expansion rate by comparing images obtained with NASA's Chandra X-ray Observatory in February 2007 and July 2009. We assume the remnant has expanded uniformly by some factor, and allow for a possible change in X-ray brightness by another factor, with a possible shift in expansion center. The model depends on four parameters: scale, brightness, and position shifts. We estimate parameter values and confidence intervals using both C-statistics and Markov chain Monte Carlo simulations; the results are essentially identical. We find expansion of 0.62±0.050% per year, making the time from explosion 160±15 years, in the absence of deceleration. While these data cannot constrain deceleration, it has most likely occurred, with the remnant expanding faster in the past, making these results an upper limit on the age of the remnant. The mean expansion is consistent with the rates obtained in a previous study, but with smaller errors. We find that the remnant has increased in brightness, as well, by a rate of about 3% per year. Preliminary results also suggest more rapid expansion (in comparison to the average) in the East and West lobes, and slower expansion in the radio bright region to the North.

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