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An approximate theory for substructure propagation in clusters
Univ Paris 06, CNRS, France ; Moscow Inst Phys & Technol, Russia.ORCID iD: 0000-0001-6511-4330
2007 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 474, no 2, p. 375-384Article in journal (Refereed) Published
Abstract [en]

Aims. The existence of dark matter can be proved in an astrophysical context by the discovery of a system in which the observed baryons and the inferred dark matter are spatially segregated, such as the bullet cluster (1E0657-558). The full descriptions of the dark matter halo and X-ray gas substructure motions are necessary to forecast the location of the dark halo from X-ray maps, which can be confirmed by the detection of a galaxy concentration or by gravitational lensing. Methods. We present an analytical hydrodynamic model to determine the distance between the X-ray and dark-matter components and the Mach number of the merger shock. Results. An approximate solution is given for the problem of the substructure propagation in merging clusters. A new method to predict the position of a dark matter halo in clusters, where there is a separation between the X-ray gas and the dark halo, is proposed and applied to the clusters 1E0657-558 and Abell 1763.

Place, publisher, year, edition, pages
2007. Vol. 474, no 2, p. 375-384
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-42862DOI: 10.1051/0004-6361:20077542ISI: 000250106100010OAI: oai:DiVA.org:lnu-42862DiVA, id: diva2:807513
Available from: 2015-04-23 Created: 2015-04-23 Last updated: 2017-12-04Bibliographically approved

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Prokhorov, Dmitry

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