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Mass-to-light ratio gradients in early-type galaxy haloes

Napolitano, Nicola R; Capaccioli, Massimo; Romanowsky, A J; Douglas, Nigel G; Merrifield, M R; Kuijken, Konrad; Arnaboldi, Magda; Gerhard, Ortwin; Freeman, Kenneth

Description

Owing to the fact that the near future should see a rapidly expanding set of probes of the halo masses of individual early-type galaxies, we introduce a convenient parameter for characterizing the halo masses from both observational and theoretical results: ∇ℓΥ, the logarithmic radial gradient of the mass-to-light ratio. Using halo density profiles from Λ-cold dark matter (CDM) simulations, we derive predictions for this gradient for various galaxy luminosities and star formation efficiencies...[Show more]

dc.contributor.authorNapolitano, Nicola R
dc.contributor.authorCapaccioli, Massimo
dc.contributor.authorRomanowsky, A J
dc.contributor.authorDouglas, Nigel G
dc.contributor.authorMerrifield, M R
dc.contributor.authorKuijken, Konrad
dc.contributor.authorArnaboldi, Magda
dc.contributor.authorGerhard, Ortwin
dc.contributor.authorFreeman, Kenneth
dc.date.accessioned2015-12-13T22:48:37Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/80164
dc.description.abstractOwing to the fact that the near future should see a rapidly expanding set of probes of the halo masses of individual early-type galaxies, we introduce a convenient parameter for characterizing the halo masses from both observational and theoretical results: ∇ℓΥ, the logarithmic radial gradient of the mass-to-light ratio. Using halo density profiles from Λ-cold dark matter (CDM) simulations, we derive predictions for this gradient for various galaxy luminosities and star formation efficiencies ∈SF. As a pilot study, we assemble the available ∇ℓΥ data from kinematics in early-type galaxies - representing the first unbiased study of halo masses in a wide range of early-type galaxy luminosities - and find a correlation between luminosity and ∇ℓΥ, such that the brightest galaxies appear the most dark-matter dominated. We find that the gradients in most of the brightest galaxies may fit in well with the ΛCDM predictions, but that there is also a population of fainter galaxies whose gradients are so low as to imply an unreasonably high star formation efficiency ∈SF > 1. This difficulty is eased if dark haloes are not assumed to have the standard ΛCDM profiles, but lower central concentrations.
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectKeywords: Dark matter; Galaxies: evolution; Galaxies: fundamental parameters; Galaxies: haloes; Galaxies: kinematics and dynamics
dc.titleMass-to-light ratio gradients in early-type galaxy haloes
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume357
dc.date.issued2005
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationMigratedxPub8474
local.type.statusPublished Version
local.contributor.affiliationNapolitano, Nicola R, University of Groningen Kapteyn Astronomical Institute
local.contributor.affiliationCapaccioli, Massimo, INAF-Osservatorio Astronomico di Capadimonte
local.contributor.affiliationRomanowsky, A J, University of Nottingham
local.contributor.affiliationDouglas, Nigel G, University of Groningen
local.contributor.affiliationMerrifield, M R, University of Nottingham
local.contributor.affiliationKuijken, Konrad, University of Groningen
local.contributor.affiliationArnaboldi, Magda, INAF-Osservatorio Astronomico di Torino
local.contributor.affiliationGerhard, Ortwin, Universitat Basel
local.contributor.affiliationFreeman, Kenneth, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage691
local.bibliographicCitation.lastpage706
local.identifier.doi10.1111/j.1365-2966.2005.08683.x
dc.date.updated2015-12-11T10:29:37Z
local.identifier.scopusID2-s2.0-14544292440
CollectionsANU Research Publications

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