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Galactic Centre hypershell model for the North Polar Spurs

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Title: Galactic Centre hypershell model for the North Polar Spurs
Authors: Sofue, Y. Browse this author
Habe, A. Browse this author
Kataoka, J. Browse this author
Totani, T. Browse this author
Inoue, Y. Browse this author
Nakashima, S. Browse this author
Matsui, H. Browse this author
Akita, M. Browse this author
Keywords: ISM: individual objects: (North Polar Spur)
ISM: jets and outflows
galaxy: nucleus
galaxies: individual: objects (the Galaxy)
X-rays: diffuse background
Issue Date: 12-Jun-2016
Publisher: Oxford University Press
Journal Title: Monthly notices of the royal astronomical society
Volume: 459
Issue: 1
Start Page: 108
End Page: 120
Publisher DOI: 10.1093/mnras/stw623
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 degrees x +/- 50 degrees 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 H-2 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.
Rights: This article has been accepted for publication in [Monthly notices of the Royal Astronomical Society] ©: [2016] [A. Habe] Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 羽部 朝男

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