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

Journal article

Authors/Editors

Angus, Garry

Research Areas

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Publication Details

Author list: Angus GW, McGaugh SS

Publisher: Oxford University Press

Place: OXFORD

Publication year: 2008

Journal: Monthly Notices of the Royal Astronomical Society (0035-8711)

Journal acronym: MON NOT R ASTRON SOC

Volume number: 383

Issue number: 2

Start page: 417

End page: 423

Number of pages: 7

ISSN: 0035-8711

eISSN: 1365-2966

Languages: English-Great Britain (EN-GB)

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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 (similar to 4700 km s(-1)) occur naturally in MOND. CDM can generate collision velocities of at most similar to 3800 km s(-1), and is only consistent with the data, provided that the shock velocity has been substantially enhanced by hydrodynamical effects.

Keywords

Dark matter, galaxies : clusters : individual : 1E 0657-56, gravitation

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