{
  "abstract": "We present an all-sky analysis of soft X-ray emission associated with the Milky Way using HaloSat and ROSAT data, extending our previous study of five Galactic-plane regions to 330 fields across the sky. We performed uniform spectral fitting with a model including an unabsorbed Local Hot Bubble and two additional absorbed thermal components, representing emission from warm–hot and hot plasma, while accounting for solar wind charge exchange and the cosmic X-ray background. The warm–hot component is often interpreted as emission from the circumgalactic medium, whereas the origin of the hot component remains uncertain. Individual-field fits generally favored the inclusion of the hot component and the field-to-field temperature distributions had medians of kT = 0.19 and 0.74 keV, with 16th–84th percentile ranges of 0.17–0.21 and 0.61–0.90 keV, respectively. The corresponding 16th–84th percentile EM ranges were (1.0–8.2) × 10−2 and (0.5–4.1) × 10−3 cm−6 pc. Stacked spectra from fields within 60∘ ≤ l ≤ 180∘ supported the individual-field results. After excluding bright X-ray sources and large-scale Galactic structures, we modeled the EM distributions of 178 fields using a hybrid spatial framework comprising stellar emission and disk-like and halo-like diffuse-plasma components. The warm–hot emission was described mainly by the disk-like term, whereas the hot emission was described mainly by stellar emission with an additional halo-like term. These results support a widespread two-temperature description and suggest a composite origin for the hot emission.",
  "abstract_shown": true,
  "affiliations": [
    "Nagoya University",
    "NASA/Marshall Space Flight Center",
    "Tokyo University of Science",
    "NASA/Goddard Space Flight Center",
    "UVSQ Université Paris-Saclay",
    "Johns Hopkins University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 8,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Kazuki Ampuku",
      "orcid": "0009-0005-3295-7215"
    },
    {
      "affs": [
        0
      ],
      "name": "Ikuyuki Mitsuishi",
      "orcid": "0000-0002-9901-233X"
    },
    {
      "affs": [
        1
      ],
      "name": "Philip Kaaret",
      "orcid": "0000-0002-3638-0637"
    },
    {
      "affs": [
        2
      ],
      "name": "Kyoko Matsushita",
      "orcid": "0000-0003-2907-0902"
    },
    {
      "affs": [
        2
      ],
      "name": "Kotaro Fukushima",
      "orcid": "0000-0001-8055-7113"
    },
    {
      "affs": [
        3
      ],
      "name": "Lorella Angelini",
      "orcid": "0000-0002-6631-6628"
    },
    {
      "affs": [
        4
      ],
      "name": "Dimitra Koutroumpa",
      "orcid": "0000-0002-5716-3412"
    },
    {
      "affs": [
        3,
        5
      ],
      "name": "K. D. Kuntz"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/eyj1a11s4qmvz.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea6ce",
  "fulltext_url": null,
  "id": "eyj1a11s4qmvz",
  "issns": [
    "1538-4357",
    "0004-637X"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea6ce",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "feed-journal",
      "astronomy/general"
    ],
    [
      "hal",
      "0.sdu"
    ],
    [
      "openalex",
      "3103|Astrophysical Phenomena and Observations"
    ]
  ],
  "openalex": "W7213433585",
  "pdf_url": "https://hal.science/hal-05844063/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/eyj1a11s4qmvz.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:17Z",
      "native_id": "10.3847/1538-4357/aea6ce",
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    },
    {
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      "url": "https://hal.science/hal-05844063v1"
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  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Probing the All-sky Distribution of Soft X-Ray Emission Associated with the Milky Way",
  "title_text": "Probing the All-sky Distribution of Soft X-Ray Emission Associated with the Milky Way",
  "type": "peer-reviewed",
  "updated_at": "2026-10-31T12:20:56Z",
  "url": "https://research.draconitic.com/paper/eyj1a11s4qmvz",
  "venue": "The Astrophysical Journal",
  "versions": []
}