Luminous giants populate the dense Cosmic Web: The radio luminosity-environmental density relation for radio galaxies in action
arxiv(2024)
摘要
Giant radio galaxies (GRGs, giant RGs, or giants) are megaparsec-scale,
jet-driven outflows from accretion disks of supermassive black holes, and
represent the most extreme pathway by which galaxies can impact the Cosmic Web
around them. A long-standing but unresolved question is why giants are so much
larger than other radio galaxies. It has been proposed that, in addition to
having higher jet powers than most RGs, giants might live in especially
low-density Cosmic Web environments. In this work, we aim to test this
hypothesis by pinpointing Local Universe giants and other RGs in physically
principled, Bayesian large-scale structure reconstructions. More specifically,
we localised a LOFAR Two-metre Sky Survey (LoTSS) DR2-dominated sample of
luminous (l_ν(ν = 150 MHz) ≥ 10^24 W Hz^-1)
giants and a control sample of LoTSS DR1 RGs, both with spectroscopic redshifts
up to z_max = 0.16, in the BORG SDSS Cosmic Web reconstructions. We
measured the Cosmic Web density for each RG; for the control sample, we then
quantified the relation between RG radio luminosity and Cosmic Web density.
With the BORG SDSS tidal tensor, we also measured for each RG whether the
gravitational dynamics of its Cosmic Web environment resemble those of
clusters, filaments, sheets, or voids. Luminous giants populate large-scale
environments that tend to be denser than those of general RGs. This shows that
– at least at high jet powers – low-density environments are no prerequisite
for giant growth. This result is corroborated by gravitational dynamics
classification and a cluster catalogue crossmatching analysis. This work
presents more than a thousand inferred megaparsec-scale densities around radio
galaxies. Our findings are consistent with the view that giants are regular,
rather than mechanistically special, members of the radio galaxy population.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要