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Baryonification IV: Constraining baryonic feedback with X-ray gas fractions — arXiv:2609.09144

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.09144
License (as archived): CC0-1.0
Archived: 2026-10-16T16:15:58.942Z
SHA-256 of the archived text: e8a2c2c8cd0424d5ba26d24a6546518e638e7b5f4eaf9da21531162e49c5e681
Stable URL of this page: https://metraipolis.com/documento/dc_2cdcdfd4ef9d

How to cite

Baryonification IV: Constraining baryonic feedback with X-ray gas fractions — arXiv:2609.09144 — arXiv (en), https://arxiv.org/abs/2609.09144 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_2cdcdfd4ef9d (Metraipolis archive dc_2cdcdfd4ef9d, sha256 e8a2c2c8cd0424d5ba26d24a6546518e638e7b5f4eaf9da21531162e49c5e681)

BibTeX

@misc{dc2cdcdfd4ef9d,
  title = {Baryonification IV: Constraining baryonic feedback with X-ray gas fractions — arXiv:2609.09144},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.09144},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_2cdcdfd4ef9d; sha256 e8a2c2c8cd0424d5ba26d24a6546518e638e7b5f4eaf9da21531162e49c5e681},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.09144. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Baryonic feedback redistributes gas around dark matter halos, suppressing the matter power spectrum at scales now probed by weak lensing surveys. X-ray observations directly trace this hot gas, and are one of the main probes of its distribution and properties. We present a forward-modelling framework, built on the baryonification model, linking the three-dimensional gas density and temperature profiles of groups and clusters to observed X-ray surface brightness and luminosity profiles on one side, and to matter power spectrum suppression on the other. We validate the model against independent three-dimensional density reconstructions from the literature, and examine our temperature and metallicity treatment in the group-scale regime. Applying this framework to the SZ-selected CHEX-MATE and X-ray-selected eFEDs samples, we measure gas fractions across the group-to-cluster mass range while accounting for X-ray selection effects, with the first published gas fractions based on CHEX-MATE data. Combining both samples, we derive a joint constraint on the hot gas fraction retained by groups and clusters as a function of mass and on the baryonic suppression of the matter power spectrum. We find $f_{\rm gas} = 0.029 \pm 0.006$ at $M_{500c} = 3\times 10^{13}M_\odot$, $f_{\rm gas} = 0.078 \pm 0.004$ at $M_{500c} = 3\times 10^{14}M_\odot$, and suppression of 6% at $k=1\,h/\rm Mpc$ and 23% at $k=5\,h/\rm Mpc$. Our findings are consistent with recent kinematic Sunyaev-Zel'dovich results, hinting at strong feedback. We also show that the $L_X$-$M$ relation is degenerate with feedback strength, and that different feedback scenarios produce distinct X-ray profile shapes that map onto the same $L_X$-$M$ point. This work is a first step toward extending the framework to forward-model diffuse X-ray emission at the map level for simulation-based inference in upcoming wide-area X-ray surveys such as eROSITA.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-09 in astro-ph.CO).
Categorie arXiv: Cosmology and Nongalactic Astrophysics (astro-ph.CO).
Pagina del lavoro: https://arxiv.org/abs/2609.09144 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-16T15:48:46.944Z dalla pagina https://arxiv.org/catchup/astro-ph.CO/2026-09-09?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).