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Investigating the magnetic field in the inter-cluster filament between Abell 3667 and Abell 3651 with POSSUM — arXiv:2608.28758

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.28758
License (as archived): CC0-1.0
Archived: 2026-10-17T10:32:41.679Z
SHA-256 of the archived text: 3ff7412b269a695713ad8136028897845badb380c2c9ea572f4c385a00ad5d95
Stable URL of this page: https://metraipolis.com/documento/dc_a66282bb18eb

How to cite

Investigating the magnetic field in the inter-cluster filament between Abell 3667 and Abell 3651 with POSSUM — arXiv:2608.28758 — arXiv (en), https://arxiv.org/abs/2608.28758 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_a66282bb18eb (Metraipolis archive dc_a66282bb18eb, sha256 3ff7412b269a695713ad8136028897845badb380c2c9ea572f4c385a00ad5d95)

BibTeX

@misc{dca66282bb18eb,
  title = {Investigating the magnetic field in the inter-cluster filament between Abell 3667 and Abell 3651 with POSSUM — arXiv:2608.28758},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.28758},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_a66282bb18eb; sha256 3ff7412b269a695713ad8136028897845badb380c2c9ea572f4c385a00ad5d95},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.28758. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

[Abridged abstract] The objective of this study is to measure the magnetic field within the prominent inter-cluster filament recently detected in X-rays by the extended ROentgen Survey with an Imaging Telescope Array (eROSITA). This filament spans over 13 Mpc projected on the sky, connecting the galaxy clusters Abell 3667 and Abell 3651. We employed the Polarisation Sky Survey of the Universe's Magnetism (POSSUM) Rotation Measure (RM) grid to isolate the RM dispersion and median value of background polarised sources induced by the filament's magnetised plasma, and to infer the strength of this magnetic field. The filament region is sampled by 54 background polarised sources. After subtracting the foreground Galactic RM, we detected a marginal residual RM dispersion in the filament region of $6.9\pm3.6$ rad/m$^{2}$, together with a coherent residual RM signal with median $6.3\pm1.3$ rad/m$^{2}$. Assuming simplified single-scale magnetic-field models and adopting informed priors on the thermal electron density distribution derived from the X-ray analysis, we constrained the magnetic field strength to the range 0.1-3.5 $\mu$G within 95$\%$ confidence, with preferred values around 0.2-0.3 $\mu$G depending on the assumed magnetic-field coherence scale. However, we also found that the Galactic foreground RM in this region is highly structured on angular scales comparable to the extent of the filament itself, representing a major source of uncertainty for the RM analysis. Our results provide the first magnetic field constraints based on Faraday rotation measurements in an individual X-ray-detected inter-cluster filament, with field strengths consistent with theoretical expectations for gas in bridges and cluster outskirts. Our analysis also highlights the critical importance of accurately modelling Galactic RM foregrounds for future studies of extra-galactic magnetism with POSSUM and the SKA.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-01 in astro-ph.CO).
Categorie arXiv: Cosmology and Nongalactic Astrophysics (astro-ph.CO).
Pagina del lavoro: https://arxiv.org/abs/2608.28758 — 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 2026-10-17T10:18:33.539Z dalla pagina https://arxiv.org/catchup/astro-ph.CO/2026-09-01?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).