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 present the first dynamical mass estimates and scaling relations for asample of Sunyaev-Zel'dovich effect (SZE) selected galaxy clusters. The sampleconsists of 16 massive clusters detected with the Atacama Cosmology Telescope(ACT) over a 455 sq. deg. area of the southern sky. Deep multi-objectspectroscopic observations were taken to secure intermediate-resolution(R~700-800) spectra and redshifts for ~60 member galaxies on average percluster. The dynamical masses M_200c of the clusters have been calculated usingsimulation-based scaling relations between velocity dispersion and mass. Thesample has a median redshift z=0.50 and a median mass M_200c~12e14 Msun/h70with a lower limit M_200c~6e14 Msun/h70, consistent with the expectations forthe ACT southern sky survey. These masses are compared to the ACT SZEproperties of the sample, specifically, the match-filtered central SZEamplitude y, the central Compton parameter y0, and the integrated Comptonsignal Y_200c, which we use to derive SZE-Mass scaling relations. All SZEestimators correlate with dynamical mass with low intrinsic scatter (<~20%), inagreement with numerical simulations. We explore the effects of varioussystematic effects on these scaling relations, including the correlationbetween observables and the influence of dynamically disturbed clusters. Usingthe 3-dimensional information available, we divide the sample into relaxed anddisturbed clusters and find that ~50% of the clusters are disturbed. There arehints that disturbed systems might bias the scaling relations but given thecurrent sample sizes these differences are not significant; further studiesincluding more clusters are required to assess the impact of these clusters onthe scaling relations.

The Atacama Cosmology Telescope: Dynamical Masses and Scaling Relations for a Sample of Massive Sunyaev-Zel'dovich Effect Selected Galaxy Clusters