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29 March 2024 |
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The Crab Nebula's Dynamical Age as Measured from its Northern Filamentary Jet | G. C. Rudie
; R. A. Fesen
; T. Yamada
; | Date: |
7 Jan 2008 | Abstract: | We present a deep [O III] 4959,5007 image of the northern filamentary jet in
the Crab Nebula taken with the 8.2m Subaru telescope. Using this image and an
image taken with the KPNO 4m in 1988 (Fesen & Staker 1993), we have computed
proper motions for 35 locations in the jet. The results suggest that when
compared to the main body of the remnant, the jet experienced less outward
acceleration from the central pulsar’s rapidly expanding synchrotron nebula.
The jet’s apparent expansion rate yields an undecelerated explosion date for
the Crab Nebula of 1055 plus or minus 24 C.E., a date much closer to the
appearance of the historic 1054 C.E. guest star than the 1120 - 1140 C.E. dates
estimated in previous studies using filaments located within the remnant’s main
nebula. Our proper motion measurements suggest the jet likely formed during the
1054 supernova explosion and represents the remnant’s highest velocity knots
possibly associated with a suspected N-S bipolar outflow from the supernova
explosion. | Source: | arXiv, 0801.0893 | Services: | Forum | Review | PDF | Favorites |
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