decaparsecとは 意味・読み方・使い方

名詞

decaparsec (複数形 decaparsecs)

1. A distance of ten parsecs
   • 2016, Dimitris M. Christodoulou, Denise C. Gabuzda, Sebastian Knuettel, Ioannis Contopoulos, Demosthenes Kazanas, Colm P. Coughlan, “Dominance of outflowing electric currents on decaparsec to kiloparsec scales in extragalactic jets”, in arXiv^[1]:

     In most models, the direction of the magnetic field is random, but if the axial field is generated by a Cosmic Battery generated by current in the direction of rotation in the accretion disk, there is a correlation between the directions of the spin of the AGN accretion disk and of the axial field, which leads to a specific direction for the axial electric current, azimuthal magnetic field, and the resulting observed transverse Faraday-rotation (FR) gradient across the jet, due to the systematic change in the line-of-sight magnetic field. We consider new observational evidence for the presence of a nested helical magnetic-field structure such as would be brought about by the operation of the Cosmic Battery, and make predictions about the expected behavior of transverse FR gradients observed on decaparsec and kiloparsec scales.