The collision velocity of the bullet cluster in conventional and modified dynamics

G. W. Angus, S. S. McGaugh

    Research output: Contribution to journalArticle

    40 Citations (Scopus)

    Abstract

    We consider the orbit of the bullet cluster 1E 0657-56 in both cold dark matter (CDM) and Modified Newtonian Dynamics (MOND) using accurate mass models appropriate to each case in order to ascertain the maximum plausible collision velocity. Impact velocities consistent with the shock velocity (∼ 4700 km s-1) occur naturally in MOND. CDM can generate collision velocities of at most ∼3800 km s-1, and is only consistent with the data, provided that the shock velocity has been substantially enhanced by hydrodynamical effects.

    Original languageEnglish
    Pages (from-to)417-423
    Number of pages7
    JournalMonthly Notices of the Royal Astronomical Society
    Volume383
    Issue number2
    DOIs
    Publication statusPublished - Jan 2008

    Fingerprint

    collision
    collisions
    dark matter
    shock
    impact velocity
    orbits
    cold

    All Science Journal Classification (ASJC) codes

    • Space and Planetary Science

    Cite this

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    The collision velocity of the bullet cluster in conventional and modified dynamics. / Angus, G. W.; McGaugh, S. S.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 383, No. 2, 01.2008, p. 417-423.

    Research output: Contribution to journalArticle

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