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 journalArticlepeer-review

    19 Citations (Scopus)


    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
    Issue number1
    Publication statusPublished - 2016 Jun 11


    • 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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