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 a measure of the power spectrum on scales from 15 to 800 Mpc/husing the ROSAT-ESO Flux-Limited X-Ray(REFLEX) galaxy cluster catalogue. TheREFLEX survey provides a sample of the 452 X-ray brightest southern clusters ofgalaxies with the nominal flux limit S=3.0 10^{-12}erg/s/cm2 for the ROSATenergy band (0.1-2.4)keV. Several tests are performed showing no significantincompletenesses of the REFLEX clusters with X-ray luminosities brighter than10^{43}erg/s up to scales of about 800 Mpc/h. They also indicate that cosmicvariance might be more important than previous studies suggest. We regard thisas a warning not to draw general cosmological conclusions from cluster sampleswith a size smaller than REFLEX. Power spectra, P(k), of comoving clusternumber densities are estimated for flux- and volume-limited subsamples. Themost important result is the detection of a broad maximum within the comovingwavenumber range 0.022<k<0.030 h/Mpc. The data suggest an increase of the powerspectral amplitude with X-ray luminosity. Compared to optically selectedcluster samples the REFLEX P(k)is flatter for wavenumbers k<0.05 h/Mpc thusshifting the maximum of P(k) to larger scales. The smooth maximum is notconsistent with the narrow peak detected at k=0.05 h/Mpc using the Abell/ACOrichness $\ge 0$ data. In the range 0.02<k<0.4 h/Mpc general agreement is foundbetween the slope of the REFLEX P(k) and those obtained with optically selectedgalaxies. A semi-analytic description of the biased nonlinear power spectrum inredshift space gives the best agreement for low-density Cold Dark Matter modelswith or without a cosmological constant.

The ROSAT-ESO Flux-Limited X-Ray (REFLEX) galaxy cluster survey