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 present a new method for determining the local dark matter density usingkinematic data for a population of tracer stars. The Jeans equation in the$z$-direction is integrated to yield an equation that gives the velocitydispersion as a function of the total mass density, tracer density, and thetilt term that describes the coupling of vertical and radial motions. We thenfit a dark matter mass profile to tracer density and velocity dispersion datato derive credible regions on the vertical dark matter density profile. Ourmethod avoids numerical differentiation, leading to lower numerical noise, andis able to deal with the tilt term while remaining one dimensional. In thisstudy we present the method and perform initial tests on idealised mock data.We also demonstrate the importance of dealing with the tilt term for tracersthat sample $\gtrsim 1$ kpc above the disc plane. If ignored, this results in asystematic underestimation of the dark matter density.

A non-parametric method for measuring the local dark matter density