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

We examine the prospects for measurement of the Hubble parameter $H_0$ viaobservation of the secular parallax of other galaxies due to our own motionrelative to the cosmic microwave background rest frame. Peculiar velocitiesmake distance measurements to individual galaxies highly uncertain, but asurvey sampling many galaxies can still yield a precise $H_0$ measurement. Weuse both a Fisher information formalism and simulations to forecast errors in$H_0$ from such surveys, marginalizing over the unknown peculiar velocities.The optimum survey observes $\sim 10^2$ galaxies within a redshift$z_\mathrm{max}=0.06$. The required errors on proper motion are comparable tothose that can be achieved by Gaia and future astrometric instruments. Ameasurement of $H_0$ via parallax has the potential to shed light on thetension between different measurements of $H_0$.

Constraining H0 Via Extragalactic Parallax