The cosmic web of X-ray active galactic nuclei seen through the eROSITA Final Equatorial Depth Survey (eFEDS)

<p>Which galaxies in the general population turn into active galactic nuclei (AGN) is a keystone of galaxy formation and evolution.</p> <p>Thanks to SRG/eROSITA&rsquo;s contiguous 140 square degrees pilot survey field, we constructed a large, complete, and unbiased soft<br> X-ray flux-limited AGN sample at low redshift 0.05 &lt; z &lt; 0.55. Two summary statistics, the clustering using spectra from SDSS-V<br> and galaxy-galaxy lensing with imaging from HSC, are measured and interpreted with halo occupation distribution and abundance<br> matching models. Both models successfully account for the observations. We obtain an exceptional complete view of the AGN&nbsp; 12<br> halo occupation distribution. The population of AGN is broadly distributed among halos with a mean mass of 3.9+2.0&minus;2.4 &times; 10 M⊙ .<br> +0.08. This corresponds to a large-scale halo bias of b(z = 0.34) = 0.99&minus;0.10 . The central occupation has a large&nbsp; transition&nbsp;parameter&nbsp;&sigma;log10 (M) = 1.28 &plusmn; 0.2. The satellite occupation distribution is characterized by a shallow slope &alpha;sat = 0.73 &plusmn; 0.38. We find that&nbsp;AGNs in satellites are rare, with fsat &lt; 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&nbsp;environmental-dependent AGN triggering. This study paves the way towards fully charting, in the coming decade, the co-evolution&nbsp;of X-ray AGN, their host galaxies, and dark matter haloes by combining eROSITA with SDSS-V, 4MOST, DESI, LSST, and Euclid.</p>