{
  "abstract": "Supernova remnants (SNRs) strongly influence the physical and chemical properties of the molecular clouds (MCs) with which they interact. We carried out a high-resolution observation toward W28F, a chemically rich MC interacting with SNR W28, with the Atacama Compact Array (ACA) in Band 7. Significant emission (>10 σ ) of CO, CH 3 OH, p -H 2 CO, SiO, and SO is detected. We reveal the clumpy structures of the shocked MC, with different spatial distributions between CH 3 OH and SiO. We select six molecular clumps to conduct spectral decomposition and non–local thermodynamic equilibrium analysis with the CH 3 OH and p -H 2 CO lines. The best-fit results show a H 2 density of n H 2 ∼ 1 –3 × 10 5 cm −3 and a gas temperature of T gas ∼ 50–170 K in most of the fitted components. The H 2 density and gas temperature show a clear anticorrelation across different regions, with the thermal pressure consistent with that of the adjacent X-ray-emitting hot plasma. This is consistent with the picture that the SNR shocks propagate into multiphase gas, with a pressure balance existing between different phases. We propose that the high abundance ratio between E-CH 3 OH and A-CH 3 OH (>0.9) suggests extra gas-phase processes to enhance this ratio, such as proton exchange with H 3 + and HCO + . The chemical segregation between CH 3 OH and SiO, in both the spatial and spectral regime, can be explained by the fact that CH 3 OH traces slow shocks while SiO traces fast shocks.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.27822",
  "author_total": 7,
  "authors": [
    {
      "name": "Tian-Yu Tu"
    },
    {
      "name": "Wenjin Yang"
    },
    {
      "name": "Siyi Feng"
    },
    {
      "name": "Valentine Wakelam"
    },
    {
      "name": "Yang Chen"
    },
    {
      "name": "Ping Zhou"
    },
    {
      "name": "Qian-Qian Zhang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/73v4456zy4bg5.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/ae839a",
  "fulltext_url": null,
  "id": "73v4456zy4bg5",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://hal.science/hal-05761139v1",
  "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": [
    [
      "hal",
      "0.sdu"
    ],
    [
      "openalex",
      "3103|Astrophysics and Star Formation Studies"
    ]
  ],
  "openalex": "W7171781401",
  "pdf_url": "https://hal.science/hal-05761139/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-07-30",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/73v4456zy4bg5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:49Z",
      "native_id": "hal-05761139",
      "source": "hal",
      "url": "https://hal.science/hal-05761139v1"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Astrophysics and Star Formation Studies",
      "subfield": "stellar"
    }
  ],
  "title": "An ACA Map of a Molecular Cloud Interacting with Supernova Remnant W28",
  "title_text": "An ACA Map of a Molecular Cloud Interacting with Supernova Remnant W28",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:49Z",
  "url": "https://research.draconitic.com/paper/73v4456zy4bg5",
  "venue": "The Astrophysical Journal",
  "versions": []
}