Galactic-Center Hyper-Shell Model for the North Polar Spurs
Abstract
The bipolar-hyper shell (BHS) model for the North Polar Spurs (NPS-E, -W, and Loop I) and counter southern spurs (SPS-E and -W) is revisited based on numerical hydrodynamical simulations. Propagations of shock waves produced by energetic explosive events in the Galactic Center are examined. Distributions of soft X-ray brightness on the sky at 0.25, 0.7, and 1.5 keV in a +/-50 deg x +/-50 deg region around the Galactic Center are modeled by thermal emission from high-temperature plasma in the shock-compressed shell considering shadowing by the interstellar HI and H2 gases. The result is compared with the ROSAT wide field X-ray images in R2, 4 and 6 bands. The NPS and southern spurs are well reproduced by the simulation as shadowed dumbbell-shaped shock waves. We discuss the origin and energetics of the event in relation to the starburst and/or AGN activities in the Galactic Center. [ High resolution pdf is available at http://www.ioa.s.u-tokyo.ac.jp/~sofue/htdocs/2016bhs/ ]
Cite
@article{arxiv.1603.02786,
title = {Galactic-Center Hyper-Shell Model for the North Polar Spurs},
author = {Y. Sofue and A. Habe and J. Kataoka and T. Totani and Y. Inoue and S. Nakashima and H. Matsui and M. Akita},
journal= {arXiv preprint arXiv:1603.02786},
year = {2016}
}
Comments
13 pages, 20 figures; To appear in MNRAS