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 |
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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
Cite this
Galactic Centre hypershell model for the North Polar Spurs. / Sofue, Y.; Habe, A.; Kataoka, Jun; Totani, T.; Inoue, Y.; Nakashima, S.; Matsui, H.; Akita, M.
In: Monthly Notices of the Royal Astronomical Society, Vol. 459, No. 1, 11.06.2016, p. 108-120.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Galactic Centre hypershell model for the North Polar Spurs
AU - Sofue, Y.
AU - Habe, A.
AU - Kataoka, Jun
AU - Totani, T.
AU - Inoue, Y.
AU - Nakashima, S.
AU - Matsui, H.
AU - Akita, M.
PY - 2016/6/11
Y1 - 2016/6/11
N2 - 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.
AB - 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.
KW - Galaxies: individual: objects (the Galaxy)
KW - Galaxy: Nucleus
KW - ISM: Individual objects: (North Polar Spur)
KW - ISM: Jets and outflows
KW - X-rays: diffuse background
UR - http://www.scopus.com/inward/record.url?scp=84969920914&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84969920914&partnerID=8YFLogxK
U2 - 10.1093/mnras/stw623
DO - 10.1093/mnras/stw623
M3 - Article
VL - 459
SP - 108
EP - 120
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 1
ER -