{
  "abstract": "We report the discovery of new and candidate Galactic supernova remnants made through over 2000 hours of H$α$ and [O III] imaging using amateur class instrumentation. These nebulae range from 0.5 to over 8 degrees in size. Five of these, namely G27.8-17.1, G115.6+9.2, G190.5+25.3, G195.9+2.2 and G239.9+7.0 exhibit low-dispersion optical spectra indicating shock emission by the presence of strong [S II] $λλ$6716,6731 and [O I] $λ$6300 line emissions relative to H$α$, or exhibit a nonradiative shock generated Balmer dominated spectrum. Their filamentary emission morphology also supports the presence of interstellar shock fronts. Three other optical nebulae, G191.3+11.1, G205.7-1.7, and G305.4-0.7 appear likely to be remnants and are proposed as new SNR candidates. We also present [O III] and H$α$ images of optical filaments associated with the 25 degree diameter Monogem Ring SNR which reveal extensive emission-line filaments around most of the remnant's X-ray boundaries. Deep images of the X-ray suspected remnant G190.4+12.5 and the large and [O III] emission dominated SNR G206.6+6.1 seen toward or near the Monogem SNR are also included. Key findings of this work include: 1) optical surveys can sometimes detect SNRs better than radio and X-ray SNR searches, 2) Balmer nonradiative shocks appear not uncommon in high Galactic latitude SNRs, and 3) faint \\O3 emission dominated SNRs may have been missed in prior H$α$ emission only surveys.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.26666",
  "author_total": 19,
  "authors": [
    {
      "name": "Robert A. Fesen"
    },
    {
      "name": "Marcel Drechsler"
    },
    {
      "name": "Bray Falls"
    },
    {
      "name": "Tim Schaeffer"
    },
    {
      "name": "Justin Anderson"
    },
    {
      "name": "Deepanshu Arora"
    },
    {
      "name": "Werner Becker"
    },
    {
      "name": "Carl Bjork"
    },
    {
      "name": "Steeve Body"
    },
    {
      "name": "Laurent Huet"
    },
    {
      "name": "Tarun Kottary"
    },
    {
      "name": "Mathew Ludgate"
    },
    {
      "name": "Nicolas Martino"
    },
    {
      "name": "Manuel Peitsch"
    },
    {
      "name": "Wolfgang Reich"
    },
    {
      "name": "Jose Rodrigues"
    },
    {
      "name": "Yann Sainty"
    },
    {
      "name": "Patrick Sparkman"
    },
    {
      "name": "Sean Walker"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ay2k27qv6n8hj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.26666",
  "fulltext_url": null,
  "id": "ay2k27qv6n8hj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.26666",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "openalex",
      "3106|Astrophysics and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7204523962",
  "pdf_url": "https://arxiv.org/pdf/2608.26666",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ay2k27qv6n8hj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:48Z",
      "native_id": "2608.26666",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.26666"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Optical Discovery of New and Candidate Galactic Supernova Remnants Plus Optical Imaging of the Monogem Supernova Remnant",
  "title_text": "Optical Discovery of New and Candidate Galactic Supernova Remnants Plus Optical Imaging of the Monogem Supernova Remnant",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:48Z",
  "url": "https://research.draconitic.com/paper/ay2k27qv6n8hj",
  "venue": "arXiv",
  "versions": []
}