Search: id:"swepub:oai:DiVA.org:uu-14439" >
The dark matter hal...
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Zackrisson, Erik
(author)
The dark matter halos of the bluest low surface brightness galaxies
- Article/chapterEnglish2006
Publisher, publication year, extent ...
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2006-06-06
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EDP Sciences,2006
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:uu-14439
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-14439URI
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https://doi.org/10.1051/0004-6361:20054196DOI
Supplementary language notes
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Language:English
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Summary in:English
Part of subdatabase
Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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We present BVI photometry and long-slit Hα rotation curve data obtained with ESO VLT/FORS2 for six low surface brightness galaxies with extremely blue colours and very faint central regions. We find no evidence for a steep central density cusp of the type predicted by many N-body simulations of cold dark matter (CDM) halos. Our observations are instead consistent with dark matter halos characterized by cores of roughly constant density, in agreement with previous investigations. While unremarkable in terms of the central density slope, these galaxies appear unusually challenging for existing CDM halo models in terms of average central halo density, as measured by the ΔV/2 parameter. Since most of our target galaxies are bulgeless disks, our observations also disfavour a recently suggested mechanism for lowering the central mass concentration of the halo by means of a fast collapse phase, as this scenario predicts that the original CDM profile should still be detectable in bulgeless galaxies. Other potential ways of reconciling the CDM predictions with these observations are discussed.
Subject headings and genre
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cosmology: dark matter
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galaxies: halos
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galaxies: kinematics and dynamics
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galaxies: formation
Added entries (persons, corporate bodies, meetings, titles ...)
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Bergvall, NilsUppsala universitet,Institutionen för astronomi och rymdfysik,astronomi,galax
(author)
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Marquart, ThomasUppsala universitet,Institutionen för astronomi och rymdfysik,astronomi,galax
(author)
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Östlin, Göran
(author)
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Uppsala universitetInstitutionen för astronomi och rymdfysik
(creator_code:org_t)
Related titles
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In:A&A: EDP Sciences452:857
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In:Astronomy & Astrophysics: EDP Sciences452:8570004-63611432-0746
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