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

Whether or not $z \gtrsim 6$ quasars lie in the most massive dark-matterhalos of the Universe is still a subject of dispute. While most theoreticalstudies support this scenario, current observations yield discordant resultswhen they probe the halo mass through the detection rate of quasar companiongalaxies. Feedback processes from supermassive black holes and dust obscurationhave been blamed for this discrepancy, but the impact of these effects iscomplex and far from being clearly understood. This paper aims to improve theinterpretation of current far-infrared observations by taking into account thecosmological volume probed by the Atacama Large Millimeter/submillimeter ArrayTelescope and to explain the observational discrepancies. We statisticallyinvestigate the detection rate of quasar companions in current observations andverify if they match the expected distribution from various theoretical models,once convolved with the ALMA field-of-view, through the use of Monte Carlosimulations. We demonstrate that the telescope geometrical bias is fundamentaland can alone explain the scatter in the number of detected satellite galaxiesin different observations. We conclude that the resulting companion densitiesdepend on the chosen galaxy distributions. According to our fiducial models,current data favour a density scenario where quasars lie in dark-matter halosof viral mass $M_{\rm vir} \gtrsim 10^{12}~{\rm M_{\odot}}$, in agreement withmost theoretical studies. According to our analysis, each quasar has about 2companion galaxies, with a [CII] luminosity $L_{\rm [CII]} \gtrsim 10^8~{\rmL}_{\odot}$, within a distance of about 1~Mpc from the quasar.

Are there more galaxies than we see around high-$z$ quasars?