Footprints of the Newly-Discovered Vela Supernova in Antarctic Ice Cores?
The recently-discovered, nearby young supernova remnant in the southeast corner of the older Vela supernova remnant may have been seen in measurements of nitrate abundances in Antarctic ice cores. Such an interpretation of this twenty-year-old ice-core data would provide a more accurate dating of th...
| Main Authors: | , |
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| Format: | Text |
| Language: | English |
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1999
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.317.4450 http://arxiv.org/pdf/astro-ph/9909010v3.pdf |
| Summary: | The recently-discovered, nearby young supernova remnant in the southeast corner of the older Vela supernova remnant may have been seen in measurements of nitrate abundances in Antarctic ice cores. Such an interpretation of this twenty-year-old ice-core data would provide a more accurate dating of this supernova than is possible purely using astrophysical techniques. It permits an inference of the supernova4s 44Ti yield purely on an observational basis, without reference to supernova modelling. The resulting estimates of the supernova distance and light-arrival time are 200 pc and 700 years ago, implying an expansion speed of 5,000 km/s for the supernova remnant. Such an expansion speed has been argued elsewhere to imply the explosion to have been a 15 M ⊙ Type II supernova. This interpretation also adds new evidence to the debate as to whether nearby supernovae can measurably affect nitrate abundances in polar ice cores. Only a handful of supernovae have exploded over the last thousand years within several kpc of the Earth. To this select group – which is summarized1 in Table 1 – there has recently been a new addition, due to the discovery of a young supernova remnant in ROSAT X-ray data, RX J0852.0- 4622, quite nearby [1]. This remnant has RA 8 h 52 m |
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