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Article: On Einstein clusters as galactic dark matter haloes

TitleOn Einstein clusters as galactic dark matter haloes
Authors
KeywordsDark Matter
Issue Date2007
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNR
Citation
Monthly Notices of the Royal Astronomical Society, 2007, v. 379 n. 1, p. 393-398 How to Cite?
AbstractWe consider global and gravitational lensing properties of the recently suggested Einstein clusters of weakly interacting massive particles (WIMPs) as galactic dark matter haloes. Being tangential pressure dominated, Einstein clusters are strongly anisotropic systems which can describe any galactic rotation curve by specifying the anisotropy. Due to this property, Einstein clusters may be considered as dark matter candidates. We analyse the stability of the Einstein clusters against both radial and non-radial pulsations, and we show that the Einstein clusters are dynamically stable. With the use of the Buchdahl type inequalities for anisotropic bodies, we derive upper limits on the velocity of the particles defining the cluster. These limits are consistent with those obtained from stability considerations. The study of light deflection shows that the gravitational lensing effect is slightly smaller for the Einstein clusters as compared to the singular isothermal density sphere model for dark matter. Therefore, lensing observations may discriminate, at least, in principle, between Einstein cluster and the other dark matter models. © 2007 RAS.
Persistent Identifierhttp://hdl.handle.net/10722/91785
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorBöhmer, CGen_HK
dc.contributor.authorHarko, Ten_HK
dc.date.accessioned2010-09-17T10:26:33Z-
dc.date.available2010-09-17T10:26:33Z-
dc.date.issued2007en_HK
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2007, v. 379 n. 1, p. 393-398en_HK
dc.identifier.issn0035-8711en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91785-
dc.description.abstractWe consider global and gravitational lensing properties of the recently suggested Einstein clusters of weakly interacting massive particles (WIMPs) as galactic dark matter haloes. Being tangential pressure dominated, Einstein clusters are strongly anisotropic systems which can describe any galactic rotation curve by specifying the anisotropy. Due to this property, Einstein clusters may be considered as dark matter candidates. We analyse the stability of the Einstein clusters against both radial and non-radial pulsations, and we show that the Einstein clusters are dynamically stable. With the use of the Buchdahl type inequalities for anisotropic bodies, we derive upper limits on the velocity of the particles defining the cluster. These limits are consistent with those obtained from stability considerations. The study of light deflection shows that the gravitational lensing effect is slightly smaller for the Einstein clusters as compared to the singular isothermal density sphere model for dark matter. Therefore, lensing observations may discriminate, at least, in principle, between Einstein cluster and the other dark matter models. © 2007 RAS.en_HK
dc.languageengen_HK
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNRen_HK
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectDark Matteren_HK
dc.titleOn Einstein clusters as galactic dark matter haloesen_HK
dc.typeArticleen_HK
dc.identifier.emailHarko, TC:harko@hkucc.hku.hken_HK
dc.identifier.authorityHarko, TC=rp1333en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1111/j.1365-2966.2007.11977.xen_HK
dc.identifier.scopuseid_2-s2.0-34547175149en_HK
dc.identifier.hkuros132666-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34547175149&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume379en_HK
dc.identifier.issue1en_HK
dc.identifier.spage393en_HK
dc.identifier.epage398en_HK
dc.identifier.eissn1365-2966-
dc.identifier.isiWOS:000248373800042-
dc.identifier.citeulike1455449-

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