English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We introduce a self-similar mass model for early-type galaxies, and constrainit using the aperture mass-radius relations determined from the geometries of22 gravitational lenses. The model consists of two components: a concentratedcomponent which traces the light distribution, and a more extended power-lawcomponent (rho propto r^-n) which represents the dark matter. We find that lensgalaxies have total mass profiles which are nearly isothermal, or slightlysteeper, on the several-kiloparsec radial scale spanned by the lensed images.In the limit of a single-component, power-law radial profile, the model impliesn=2.07+/-0.13, consistent with isothermal (n=2). Models in which mass traceslight are excluded at >99 percent confidence. An n=1 cusp (such as theNavarro-Frenk-White profile) requires a projected dark matter mass fraction off_cdm = 0.22+/-0.10 inside 2 effective radii. These are the best statisticalconstraints yet obtained on the mass profiles of lenses, and provide clearevidence for a small but non-zero dark matter mass fraction in the innerregions of early-type galaxies. In addition, we derive the first strong lensingconstraint on the relation between stellar mass-to-light ratio (Upsilon) andgalaxy luminosity (L): Upsilon propto L^[0.14 (+0.16)(-0.12)], which isconsistent with the relation suggested by the fundamental plane. Finally, weapply our self-similar mass models to current problems regarding theinterpretation of time delays and flux ratio anomalies in gravitational lenssystems.Comment: 30 pages including 6 figures, to be published in Ap

Self‐similar Models for the Mass Profiles of Early‐Type Lens Galaxies