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08 February 2025
 
  » arxiv » 2301.01388

 Article overview



The cosmic web of X-ray active galactic nuclei seen through the eROSITA Final Equatorial Depth Survey (eFEDS)
Johan Comparat ; Wentao Luo ; Andrea Merloni ; Surhud More ; Mara Salvato ; Mirko Krumpe ; Takamitsu Miyaji ; William Brandt ; Antonis Georgakakis ; Masayuki Akiyama ; Johannes Buchner ; Tom Dwelly ; Toshihiro Kawaguchi ; Teng Liu ; Tohru Nagao ; Kirpal Nandra ; John Silverman ; Yoshiki Toba ; Scott F. Anderson ; Juna Kollmeier ;
Date 4 Jan 2023
AbstractWhich galaxies in the general population turn into active galactic nuclei (AGN) is a keystone of galaxy formation and evolution. Thanks to SRG/eROSITA’s contiguous 140 square degrees pilot survey field, we constructed a large, complete, and unbiased soft X-ray flux-limited AGN sample at low redshift $0.05<z<0.55$. Two summary statistics, the clustering using spectra from SDSS-V and galaxy-galaxy lensing with imaging from HSC, are measured and interpreted with halo occupation distribution and abundance matching models. Both models successfully account for the observations. We obtain an exceptional complete view of the AGN halo occupation distribution. The population of AGN is broadly distributed among halos with a mean mass of $3.9 _{- 2.4 }^{+ 2.0 } imes10^{12}M_odot$. This corresponds to a large-scale halo bias of $b(z=0.34)= 0.99 ^{+0.08}_{-0.10}$. The central occupation has a large transition parameter $sigma_{log_{10}(M)}=1.28pm0.2$. The satellite occupation distribution is characterized by a shallow slope $alpha_{ m sat}=0.73pm0.38$. We find that AGNs in satellites are rare, with $f_{ m sat}<20\%$. Most soft X-ray-selected AGNs are hosted by central galaxies in their dark matter halo. A weak correlation between soft X-ray luminosity and large-scale halo bias is confirmed (3.3$sigma$). We discuss the implications of environmental-dependent AGN triggering. This study paves the way towards fully charting, in the coming decade, the co-evolution of X-ray AGN, their host galaxies, and dark matter haloes by combining eROSITA with SDSS-V, 4MOST, DESI, LSST, and Euclid.
Source arXiv, 2301.01388
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