Is Vela Jr. a young supernova remnant?

Details Is Vela Jr. a young supernova remnant? Is Vela Jr. a young supernova remnant?

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009adspr..43..895k&link_type=abstract

Advances in Space Research, Volume 43, Issue 6, p. 895-899.

Physics

2

Scientific paper

The supernova remnant RX J0852.0-4622 (or Vela Jr.) has been considered to be very young (˜680 yr) based mainly on the possible detection of a radioactive decay line of 44Ti whose lifetime is only ˜90 yr. Here, we report on expansion measurements of the northwestern rim of this remnant, based on XMM-Newton observations separated by 6.5 yr. The expansion rate is derived to be 0.026±0.05±0.09%yr (the first and second-term errors are responsible for statistical and systematic uncertainties, respectively). We estimate the age of this remnant to be ˜1000-3000 yr. Therefore, Vela Jr. turns out to be not so young as it was considered previously. The distance to this remnant is also derived to be at least ˜740 pc, assuming a high shock speed of 3000kms.

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