Galactic Centre hypershell model for the North Polar Spurs

Y. Sofue; A. Habe; J. Kataoka; T. Totani; Y. Inoue; S. Nakashima; H. Matsui; M. Akita

doi:10.1093/mnras/stw623

Galactic Centre hypershell model for the North Polar Spurs

Y. Sofue, A. Habe, J. Kataoka, T. Totani, Y. Inoue, S. Nakashima, H. Matsui, M. Akita

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

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	https://doi.org/10.1093/mnras/stw623
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

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/stw623

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title = "Galactic Centre hypershell model for the North Polar Spurs",

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.",

keywords = "Galaxies: individual: objects (the Galaxy), Galaxy: Nucleus, ISM: Individual objects: (North Polar Spur), ISM: Jets and outflows, X-rays: diffuse background",

author = "Y. Sofue and A. Habe and J. Kataoka and T. Totani and Y. Inoue and S. Nakashima and H. Matsui and M. Akita",

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year = "2016",

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doi = "10.1093/mnras/stw623",

language = "English",

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T1 - Galactic Centre hypershell model for the North Polar Spurs

AU - Sofue, Y.

AU - Habe, A.

AU - Kataoka, J.

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

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Galactic Centre hypershell model for the North Polar Spurs

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Keywords

ASJC Scopus subject areas

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