Kavli Affiliate: John Silverman
| First 5 Authors: Johan Comparat, Wentao Luo, Andrea Merloni, Surhud More, Mara Salvato
| Summary:
Which galaxies in the general population turn into active galactic nuclei
(AGNs) is a keystone of galaxy formation and evolution. Thanks to SRG/eROSITA’s
contiguous 140 square degree pilot survey field, we constructed a large,
complete, and unbiased soft X-ray flux-limited ($F_X>6.5times 10^{-15}$ erg
s$^{-1}$ cm$^{-2}$) 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 exceptionally complete view of the AGN halo
occupation distribution. The population of AGNs is broadly distributed among
halos with a mean mass of $3.9 _{- 2.4 }^{+ 2.0 }times10^{12}M_odot$. 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, $alpha_{{rm sat}}=0.73pm0.38$. We find
that AGNs in satellites are rare, with $f_{{rm sat}}<20%$. 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 toward fully charting, in the coming
decade, the coevolution of X-ray AGNs, their host galaxies, and dark matter
halos by combining eROSITA with SDSS-V, 4MOST, DESI, LSST, and textit{Euclid}
data.
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