SN 1006 at Age 1000 Years : Dazzling Star to Puzzling Remnant(Chapter 6. SN1006 Milenium Special Session, The Extreme Universe in the Suzaku Era)

概要

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The supernova of 1006 C.E. was probably the brightest star ever recorded in human history, with documented sightings by northern observers the world over despite its location at Dec (1006) = -38°. Identification of its remnant did not occur until 1965, largely because it is located in a sparse environment far above the Galactic plane and is thus quite faint. With the power of modern instrumentation, this relatively pristine and unabsorbed location has proved to be a boon as astronomers have examined the SN 1006 remnant in multiple energy bands. Diffuse acceleration at the outer shocks produce TeV electrons, whose synchrotron radiation seen in radio and X-ray bands gives strong circumstantial evidence for cosmic ray production in these same shocks. Optical emission occurs exclusively in the Balmer lines of hydrogen. Proper motion measurements of the delicate filaments along the limb, together with the shock velocity determined from Balmer-line profiles, give a precise distance of 2.2kpc. Absorption-line spectra from several background UV sources have enabled the mapping of Si, Ca, and Fe ejecta within the SN 1006 shell. I review how the combination of medieval records and modern observations are helping astronomers understand SN 1006 as a "typical" Type Ia supernova remnant, and highlight some mysteries that still remain.
理論物理学刊行会の論文
2007-12-19