Galactic Centre hypershell model for the North Polar Spurs

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

    Research output: Contribution to journalArticle

    12 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 languageEnglish
    Pages (from-to)108-120
    Number of pages13
    JournalMonthly Notices of the Royal Astronomical Society
    Volume459
    Issue number1
    DOIs
    Publication statusPublished - 2016 Jun 11

    Fingerprint

    North Polar Spur (astronomy)
    shock wave
    energetics
    shock waves
    simulation
    explosive
    high temperature plasmas
    thermal emission
    shell
    plasma
    active galactic nuclei
    sky
    brightness
    counters
    x rays
    shock
    gas
    propagation
    gases

    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 journalArticle

    Sofue, Y, Habe, A, Kataoka, J, Totani, T, Inoue, Y, Nakashima, S, Matsui, H & Akita, M 2016, 'Galactic Centre hypershell model for the North Polar Spurs', Monthly Notices of the Royal Astronomical Society, vol. 459, no. 1, pp. 108-120. https://doi.org/10.1093/mnras/stw623
    Sofue, Y. ; Habe, A. ; Kataoka, Jun ; Totani, T. ; Inoue, Y. ; Nakashima, S. ; Matsui, H. ; Akita, M. / Galactic Centre hypershell model for the North Polar Spurs. In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 459, No. 1. pp. 108-120.
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    AU - Kataoka, Jun

    AU - Totani, T.

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    AU - Nakashima, S.

    AU - Matsui, H.

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