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PreprintCC BY 4.0arXiv

Disentangling Stellar Mass and Environmental Effects on eROSITA AGN Activity using multi-wavelength data from GAMA, WISE, GALEX, and DESI Legacy Survey

  • Navya Saraswat
  • Shadab Alam
  • Subhabrata Majumdar
Open at sourcePDFDOICite

Abstract

We use a stellar-mass complete sample of ∼ 36,000 galaxies from GAMA/eFEDS to test whether AGN activity depends on environment independent of stellar mass. To isolate this effect, we introduce δrank, a novel local overdensity metric defined within narrow stellar mass bins. Our main result is that X-ray-selected AGNs show a clear environmental trend, the AGN fraction rises from ∼ 4% in low-density regions to ∼ 6% in high-density regions, with a sharp transition at δrank ∼ 0.4. This environmental dependence is absent for WISE-selected and broad-line AGN, and Eddington ratios show no variation across environments. We also found that for galaxies with SFR > 15 M⊙ yr−1, X-ray AGN fraction is approximately 5%, 60% and 20% in low, mid and high δrank galaxies. We show that relationship between AGN fraction and SFR varies dramatically with both environment and selection method. We conclude that environment on scales of ∼ 5h−1 Mpc regulates X-ray AGN triggering efficiency.

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Cite

BibTeXRIS
BibTeX
@misc{saraswat2026disentangling,
  title = {{Disentangling Stellar Mass and Environmental Effects on eROSITA AGN Activity using multi-wavelength data from GAMA, WISE, GALEX, and DESI Legacy Survey}},
  author = {Navya Saraswat and Shadab Alam and Subhabrata Majumdar},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.16333},
  eprint = {2609.16333},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.16333},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Disentangling Stellar Mass and Environmental Effects on eROSITA AGN Activity using multi-wavelength data from GAMA, WISE, GALEX, and DESI Legacy Survey
AU  - Navya Saraswat
AU  - Shadab Alam
AU  - Subhabrata Majumdar
PY  - 2026
DA  - 2026/09/14
PB  - arXiv
DO  - 10.48550/arxiv.2609.16333
UR  - https://arxiv.org/abs/2609.16333
AB  - We use a stellar-mass complete sample of ∼ 36,000 galaxies from GAMA/eFEDS to test whether AGN activity depends on environment independent of stellar mass. To isolate this effect, we introduce δ_rank, a novel local overdensity metric defined within narrow stellar mass bins. Our main result is that X-ray-selected AGNs show a clear environmental trend, the AGN fraction rises from ∼ 4% in low-density regions to ∼ 6% in high-density regions, with a sharp transition at δ_rank ∼ 0.4. This environmental dependence is absent for WISE-selected and broad-line AGN, and Eddington ratios show no variation across environments. We also found that for galaxies with SFR > 15 M_⊙ yr^−1, X-ray AGN fraction is approximately 5%, 60% and 20% in low, mid and high δ_rank galaxies. We show that relationship between AGN fraction and SFR varies dramatically with both environment and selection method. We conclude that environment on scales of ∼ 5h^−1 Mpc regulates X-ray AGN triggering efficiency.
ER  -