Prevalence of radio Active Galactic Nuclei in galaxy groups since z=3.5 in the COSMOS-Web field

@misc{ubertosi2026prevalence,
  title = {{Prevalence of radio Active Galactic Nuclei in galaxy groups since z=3.5 in the COSMOS-Web field}},
  author = {F. Ubertosi and I. Delvecchio and I. Prandoni and G. Toni and G. Zamorani and E. Daddi and M. Gitti and M. Sargent and A. Traina and C. Spingola and F. Vito and L. Moscardini and G. Gozaliasl and D. Kakkad and W. Wang and S. Sanjaripour and Z. Ghaffari and M. N. Isla Llave and R. M. Samir and G. Peluso and M. Maturi and V. Smolcic and C. Casey and J. Kartaltepe and H. J. McCracken and J. Rhodes and B. Robertson and M. Franco and D. Liu and M. Shuntov and H. Akins and O. Ilbert and A. A. Khostovan},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.10719},
  eprint = {2610.10719},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.10719},
}

TY  - UNPB
TI  - Prevalence of radio Active Galactic Nuclei in galaxy groups since z=3.5 in the COSMOS-Web field
AU  - F. Ubertosi
AU  - I. Delvecchio
AU  - I. Prandoni
AU  - G. Toni
AU  - G. Zamorani
AU  - E. Daddi
AU  - M. Gitti
AU  - M. Sargent
AU  - A. Traina
AU  - C. Spingola
AU  - F. Vito
AU  - L. Moscardini
AU  - G. Gozaliasl
AU  - D. Kakkad
AU  - W. Wang
AU  - S. Sanjaripour
AU  - Z. Ghaffari
AU  - M. N. Isla Llave
AU  - R. M. Samir
AU  - G. Peluso
AU  - M. Maturi
AU  - V. Smolcic
AU  - C. Casey
AU  - J. Kartaltepe
AU  - H. J. McCracken
AU  - J. Rhodes
AU  - B. Robertson
AU  - M. Franco
AU  - D. Liu
AU  - M. Shuntov
AU  - H. Akins
AU  - O. Ilbert
AU  - A. A. Khostovan
PY  - 2026
DA  - 2026/10/07
PB  - arXiv
DO  - 10.48550/arxiv.2610.10719
UR  - https://arxiv.org/abs/2610.10719
AB  - Radio active galactic nuclei (AGN) are key tracers of kinetic feedback from supermassive black holes. Although the dependence of their triggering on host stellar mass is well known, the impact of the large-scale environment across cosmic time is poorly understood. We investigate the role of the environment in triggering radio AGN activity, while also studying the dependence on stellar mass (10≤log M_∗ [M_⊙]≤11.4), radio luminosity (22≤log L_1.4 [W Hz^−1]≤26), and redshift (0.1≤ z ≤ 3.5). We combine the VLA-COSMOS 3 GHz Large Project with the COSMOS-Web galaxy and group catalogs, selecting radio-excess AGN and building radio luminosity functions (RLF) and radio AGN fractions separately for sources in galaxy groups (124 radio AGN) and in the field (405 radio AGN), out of the total of 20203 galaxies and 1678 galaxy groups. We fit the RLF to derive the cosmic evolution of radio AGN in different environments, and we provide a new parametric description of the radio AGN fractions as a function of environment, M_∗, L_1.4, and z. Besides confirming the known positive correlation of radio AGN fraction with host M_∗ in both groups and in the field, more importantly we find that the activation of a radio AGN in groups is enhanced relative to the field by a factor of 3--30 in space density and of 2 in radio AGN fraction at fixed stellar mass; the enhancement is also a function of M_∗, L_1.4, and z. Furthermore, in all z bins, the radio AGN fractions peak within r ≤ 0.2R_200. Overall, dense environments enhance radio AGN triggering out to at least z=3.5. We suggest the existence of a possible transition in the dominant triggering mechanism of radio AGN activity around z~1.5, potentially related to the intragroup medium in the core of groups at lower z and to merger and structure growth at earlier cosmic times.
ER  -