{
  "abstract": "Our goal is to investigate a so far only tentatively detected compact NH$_2$D source devoid of a notable NH$_3$ counterpart, located rather close to the luminous IRAS 01202+6133 source (the projected distance is $\\lesssim$0.3 pc) in the S187 high-mass star-forming region. A high ammonia deuteration in such an environment is unusual. We performed observations of this area with the 20-m OSO radio telescope in several frequency ranges from $\\sim$72 to $\\sim$112 GHz. The area was mapped at the lower frequencies while at the higher frequencies only the position of the NH$_2$D emission peak was observed. The data were analyzed using non-LTE modeling. The data confirm a compact NH$_2$D source with a size of $\\lesssim$0.2 pc. In addition, emission from about 20 molecules was detected, but only the DCO$^+$(1-0) peak coincides with the NH$_2$D clump. The clump is not associated with any known astronomical source or an NH$_3$ emission peak but the dust continuum map shows an enhancement at approximately the same position. The gas kinetic temperature derived from various indicators is $\\sim$20-30 K, which possibly characterizes the surrounding material. The intrinsic NH$_2$D line width ($\\sim$0.4 km/s) implies a clump with subsonic or transonic turbulence. The ortho/para NH$_2$D line intensity ratio is consistent with an abundance ratio of 3, expected from the spin statistics. The NH$_2$D/NH$_3$ abundance ratio may be $\\sim$1. In general, the data hint at a compact cold gravitationally stable dense core within the warm environment, which may represent pristine material. However this picture still needs a verification with observations at a higher angular resolution.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.40219",
  "author_total": 6,
  "authors": [
    {
      "name": "E. A. Trofimova"
    },
    {
      "name": "I. I. Zinchenko"
    },
    {
      "name": "C. Henkel"
    },
    {
      "name": "A. G. Pazukhin"
    },
    {
      "name": "A. F. Punanova"
    },
    {
      "name": "P. M. Zemlyanukha"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/37d2012efq1cc.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.40219",
  "fulltext_url": null,
  "id": "37d2012efq1cc",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.40219",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.40219",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/37d2012efq1cc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:28Z",
      "native_id": "2610.40219",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.40219"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "A compact NH$_2$D source without NH$_3$ counterpart in the S187 high-mass star-forming region",
  "title_text": "A compact NH_2D source without NH_3 counterpart in the S187 high-mass star-forming region",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:47Z",
  "url": "https://research.draconitic.com/paper/37d2012efq1cc",
  "venue": "arXiv",
  "versions": []
}