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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Fossil groups are considered the end product of natural galaxy groupevolution in which group members sink towards the centre of the gravitationalpotential due to dynamical friction, merging into a single, massive, and X-raybright elliptical. Since gravitational lensing depends on the mass of aforeground object, its mass concentration, and distance to the observer, we canexpect lensing effects of such fossil groups to be particularly strong. Thispaper explores the exceptional system $\mathrm{J}143454.4+522850$. We combinegravitational lensing with stellar population-synthesis to separate the totalmass of the lens into stars and dark matter. The enclosed mass profiles arecontrasted with state-of-the-art galaxy formation simulations, to conclude thatSW05 is likely a fossil group with a high stellar to dark matter mass fraction$0.027\pm0.003$ with respect to expectations from abundance matching$0.012\pm0.004$, indicative of a more efficient conversion of gas into stars infossil groups.

The lens SW05 J143454.4+522850: a fossil group at redshift 0.6?