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 study of the distribution of galaxies along the radius of 157groups and clusters of galaxies (200~km~s$^{-1}$ < $\sigma$ < 1100~km~s$^{-1}$)of the local Universe (0.01 < $z$ < 0.1). We introduced a new boundary ofgalaxy systems and identified it with the splashback radius $R_{sp}$. We alsoidentified the central region of galaxy systems with a radius of $R_c$. Theseradii are defined by the observed integrated distribution of the total numberof galaxies depending on the squared distance from the center of thegroups/clusters coinciding, as a rule, with the brightest galaxy. We show thatthe radius $R_{sp}$ is proportional to the $R_{200c}$ (radius of the virializedregion of a galaxy cluster) and to the radius of the central region $R_c$ witha slope close to 1. Among the obtained dependences of the radii on X-rayluminosity, the $\log R_{sp}$ - $\log L_X$ relation has the lowest scatter. Wemeasured $<R_{sp}>$ = $1.67\pm0.05$~Mpc for the total sample, $<R_{sp}>$ =$1.14\pm0.14$~Mpc for galaxy groups with $\sigma \leq$ 400~km~s$^{-1}$,$<R_{sp}>$ = $2.00\pm0.20$~Mpc for galaxy clusters with $\sigma$ >400~km~s$^{-1}$. We found the average ratio of the radii $R_{sp}/R_{200c} =1.40\pm0.02$ or $R_{sp}/R_{200m} = 0.88\pm0.02$.}

The splashback radius of groups and clusters of galaxies at low redshifts