{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"91c7a632d15d939868b67cc80640f023afc5b6e6d04e2ef4e8f23513ce5f4e7b","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","c9afa47442d877a07e3068c4cdf423a748b2f71fa9d516f7d0e6b95d5af9b248"],"salt":"62f387a8a7660220461fb04f10c81fbdc0950a278a1096218c157ea174e0b5e6","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"astro.circumgalactic-medium.hot-halo-extent","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[{"note":"","parent_revision":"c9afa47442d877a07e3068c4cdf423a748b2f71fa9d516f7d0e6b95d5af9b248","relation":"special_case"}],"plain":"Galaxies like ours should be wrapped in gas at a million degrees, which glows faintly in X-rays. Its density profile and how far out it reaches are only beginning to be measured.","posed_since":"","precise":"Determine the electron density profile $n_{e}(r)$ and temperature of X-ray emitting gas ($T \\sim 1e6\\,\\mathrm{K}$) around galaxies with $M_{*} \\sim 3e10\\text{ to }1e11\\,M_{\\mathrm{sun}}$ out to the virial radius (about 250 kpc), including the slope (for example a beta-model with $\\beta \\sim 0.5$) and the total hot gas mass.","problem_ref":null,"references":"","settled_by":"Stacked deep X-ray surface brightness profiles with resolved temperature and metallicity, combined with thermal Sunyaev-Zeldovich profiles for the same galaxies.","status_note":"eROSITA All-Sky Survey stacking detected extended hot gas around Milky Way-mass galaxies (Zhang et al., A&A, 2024), with the total mass and its dependence on contamination by satellites and point sources debated.","title":"How far do hot X-ray halos extend around Milky Way-mass 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