Abstract
The bipolar-hypershell (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 Centre are examined. Distributions of soft X-ray brightness on the sky at 0.25, 0.7, and 1.5 keV in the ±50° × ±50° region around the Galactic Centre are modelled by thermal emission from high-temperature plasma in the shock-compressed shell considering shadowing by the interstellar H i 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 active galactic nucleus activities in the Galactic Centre.
| Original language | English |
|---|---|
| Pages (from-to) | 108-120 |
| Number of pages | 13 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume | 459 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2016 Jun 11 |
Keywords
- Galaxies: individual: objects (the Galaxy)
- Galaxy: Nucleus
- ISM: Individual objects: (North Polar Spur)
- ISM: Jets and outflows
- X-rays: diffuse background
ASJC Scopus subject areas
- Space and Planetary Science
- Astronomy and Astrophysics