{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"41709b0cbd4e1c25d4e0f087a0557242a457b4f9b06dc21d9c10f46c884b6d24","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["c9afa47442d877a07e3068c4cdf423a748b2f71fa9d516f7d0e6b95d5af9b248","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"18695b15f10b6657ef1b8f49dfc3a80170d8d28c5b27f986f01e22e29f6eb03b","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"astro.circumgalactic-medium.missing-galactic-baryons","kind":"well-posed","literature_status":"partially-resolved","n":"2","parents":[],"plain":"A galaxy like ours should contain about one sixth of its total mass as ordinary matter, but stars and disk gas account for only a fraction of that. The rest may be in hot halo gas or may have been blown out of the halo.","posed_since":"","precise":"For halos of $M_h \\sim 10^{12}\\,M_{\\mathrm{sun}}$, stars and interstellar gas account for roughly 20 to 30 percent of $f_b M_h$ ($f_b \\sim 0.16$, the cosmic baryon fraction). Determine the mass in each phase of halo gas (cool $10^{4}\\,\\mathrm{K}$, warm $10^{5}\\,\\mathrm{K}$, hot above $10^{6}\\,\\mathrm{K}$) inside the virial radius and the mass ejected beyond it.","problem_ref":"c9afa47442d877a07e3068c4cdf423a748b2f71fa9d516f7d0e6b95d5af9b248","references":"","settled_by":"Combined X-ray emission, Sunyaev-Zeldovich and fast-radio-burst dispersion measurements of the gas profile around a stacked sample of Milky Way-mass galaxies out to and beyond the virial radius.","status_note":"eROSITA stacking detects extended hot gas around Milky Way-mass galaxies, but its share of the budget remains debated (Zhang et al., A&A, 2026).","title":"Where are the missing baryons of Milky Way-mass galaxies?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"988ca49d3fca0abbdeef79f5013718051cb25faaa306ffe2bef097e76e97c140","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"8bfea1772dfdc5844a1e060620637e323a929e7afb78801921e9bd2851d70665","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"8YLb7dPzoK1W55o_f07PsBFT8uuUCOYcn2E7xNcn9NINvQutjJQ1kBkjANmb7FNXHXp8xH82uS8sida4qjUKCw"},"schema":"pubphys.envelope/1"},"record_hash":"988ca49d3fca0abbdeef79f5013718051cb25faaa306ffe2bef097e76e97c140","leaf_index":2310}