{
  "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) x 10-2 and (0.5-4.1) x 10-3 cm-6 pc. Stacked spectra from fields within 60 deg. <= l <= 180 deg. 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": [],
  "article_type": null,
  "arxiv": "2609.16688",
  "author_total": 8,
  "authors": [
    {
      "name": "Kazuki Ampuku"
    },
    {
      "name": "Ikuyuki Mitsuishi"
    },
    {
      "name": "Philip Kaaret"
    },
    {
      "name": "Kyoko Matsushita"
    },
    {
      "name": "Kotaro Fukushima"
    },
    {
      "name": "Lorella Angelini"
    },
    {
      "name": "Dimitra Koutroumpa"
    },
    {
      "name": "K. Kuntz"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e0jyrt48x4gtq.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.16688",
  "fulltext_url": null,
  "id": "e0jyrt48x4gtq",
  "issns": [],
  "landing_url": "https://hal.science/hal-05794723v1",
  "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": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.astr"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://hal.science/hal-05794723/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/e0jyrt48x4gtq.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:55Z",
      "native_id": "hal-05794723",
      "source": "hal",
      "url": "https://hal.science/hal-05794723v1"
    },
    {
      "first_seen": "2026-10-30T12:21:41Z",
      "native_id": "2609.16688",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.16688"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "physics",
      "origin": "hal:0.phys",
      "subfield": "general"
    }
  ],
  "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": "preprint",
  "updated_at": "2026-10-30T12:21:41Z",
  "url": "https://research.draconitic.com/paper/e0jyrt48x4gtq",
  "venue": "HAL",
  "versions": []
}