Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1505r&link_type=abstract
American Astronomical Society Meeting 210, #15.05; Bulletin of the American Astronomical Society, Vol. 39, p.113
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an optical study of the expansion kinematics of the filamentary ejecta “jet” or “chimney” located along the northern periphery of the Crab Nebula supernova remnant. Proper motions of several dozen knots in the jet were measured using [O III] λλ4959,5007 images including a 1988 KPNO 4 m image and a 2005 Subaru 8.2 m image. Preliminary results of this proper motion analysis indicate that the emission features in the jet may have undergone considerably less acceleration compared to those within the main body of the remnant. From these measurements, we estimate an explosion date for the Crab Nebula much closer to 1054 CE than the 1120-1140 CE dates estimated in previous studies using filaments located within the remnant’s main nebula. Our preliminary results suggest that the ejecta that form the jet may represent the remnant’s highest velocity knots, possibly associated with a N-S bipolar outflow from the SN explosion, which placed them out beyond the nebula’s accelerating synchrotron nebula.
Fesen Robert A.
Rudie Gwen C.
Yamada Toru
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