Polar ring galaxies as tests of gravity

F. Lüghausen, B. Famaey, P. Kroupa, G. Angus, F. Combes, G. Gentile, O. Tiret, H. Zhao

    Research output: Contribution to journalArticle

    19 Citations (Scopus)

    Abstract

    Polar ring galaxies are ideal objects with which to study the three-dimensional shapes of galactic gravitational potentials since two rotation curves can be measured in two perpendicular planes. Observational studies have uncovered systematically larger rotation velocities in the extended polar rings than in the associated host galaxies. In the dark matter context, this can only be explained through dark haloes that are systematically flattened along the polar rings. Here, we point out that these objects can also be used as very effective tests of gravity theories, such as those based on Milgromian dynamics (also known as Modified Newtonian Dynamics or MOND).We run a set of polar ring models using bothMilgromian and Newtonian dynamics to predict the expected shapes of the rotation curves in both planes, varying the total mass of the system, the mass of the ring with respect to the host and the size of the hole at the centre of the ring. We find that Milgromian dynamics not only naturally leads to rotation velocities being typically higher in the extended polar rings than in the hosts, as would be the case in Newtonian dynamics without dark matter, but that it also gets the shape and amplitude of velocities correct. Milgromian dynamics thus adequately explains this particular property of polar ring galaxies.

    Original languageEnglish
    Pages (from-to)2846-2853
    Number of pages8
    JournalMonthly Notices of the Royal Astronomical Society
    Volume432
    Issue number4
    DOIs
    Publication statusPublished - Oct 2013

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    ring galaxies
    gravity
    gravitation
    rings
    dark matter
    curves
    gravitational fields
    test
    halos
    galaxies

    All Science Journal Classification (ASJC) codes

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Lüghausen, F., Famaey, B., Kroupa, P., Angus, G., Combes, F., Gentile, G., ... Zhao, H. (2013). Polar ring galaxies as tests of gravity. Monthly Notices of the Royal Astronomical Society, 432(4), 2846-2853. https://doi.org/10.1093/mnras/stt639
    Lüghausen, F. ; Famaey, B. ; Kroupa, P. ; Angus, G. ; Combes, F. ; Gentile, G. ; Tiret, O. ; Zhao, H. / Polar ring galaxies as tests of gravity. In: Monthly Notices of the Royal Astronomical Society. 2013 ; Vol. 432, No. 4. pp. 2846-2853.
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    Lüghausen, F, Famaey, B, Kroupa, P, Angus, G, Combes, F, Gentile, G, Tiret, O & Zhao, H 2013, 'Polar ring galaxies as tests of gravity', Monthly Notices of the Royal Astronomical Society, vol. 432, no. 4, pp. 2846-2853. https://doi.org/10.1093/mnras/stt639

    Polar ring galaxies as tests of gravity. / Lüghausen, F.; Famaey, B.; Kroupa, P.; Angus, G.; Combes, F.; Gentile, G.; Tiret, O.; Zhao, H.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 432, No. 4, 10.2013, p. 2846-2853.

    Research output: Contribution to journalArticle

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    Lüghausen F, Famaey B, Kroupa P, Angus G, Combes F, Gentile G et al. Polar ring galaxies as tests of gravity. Monthly Notices of the Royal Astronomical Society. 2013 Oct;432(4):2846-2853. https://doi.org/10.1093/mnras/stt639