{
  "abstract": "Context. Ultra-diffuse galaxies (UDGs) in the field are faint, diffuse systems that remain poorly represented in the literature due to the need for spectroscopic confirmation and the difficulty of obtaining high S/N emission line measurements. Aims. We present a spectroscopic study of 17 blue UDG candidates in the field using optical emission lines to confirm their diffuse nature and properties. Methods. We derived spectroscopic redshifts($z_{\\rm spec}$) for our field UDG candidates. We then computed their effective radii ($r_{\\rm eff}$) and central surface brightnesses ($μ_{0,g}$). We measured the H$α$ and H$β$ emission line fluxes in the 17 spectra and derived star-formation rates (SFR) from the line-luminosity relation. We performed forced photometry on our sample to obtain photometric fluxes and applied an aperture correction on the H$α$ integrated fluxes, propagating the correction to the derived SFRs. We then computed stellar masses ($M_*$) using colour relations and estimated dust attenuation and corrected the SFRs accordingly. Two sources were further examined as potential giant low surface-brightness galaxies(GLSBGs). Results. We identify nine confirmed UDGs, eight other low surface-brightness galaxies (LSBGs), including one GLSBG. The $z_{\\rm spec}$ of our field UDGs span a range of $0.015-0.037$, their $r_{\\rm eff}$ spans $1.69-4.99$ kpc and $μ_{0,g}$ between $24.05-24.98~{\\rm mag~arcsec}^{-2}$. Galaxies exhibit low to moderate dust content, with an average V-band attenuation of 0.29 mag. The spectroscopically confirmed UDGs presented in this work, after the aperture correction performed, lie along the star-forming main sequence. Conclusions. Our results indicate that blue field UDGs are characterised by heterogeneous dust attenuation and occupy the same region of the star formation-stellar mass plane as dwarf LSBGs.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.28109",
  "author_total": 19,
  "authors": [
    {
      "name": "A. Vanzanella"
    },
    {
      "name": "K. Malek"
    },
    {
      "name": "Junais"
    },
    {
      "name": "E. Bernaud"
    },
    {
      "name": "A. Gargiulo"
    },
    {
      "name": "H. Thuruthipilly"
    },
    {
      "name": "K. Lisiecki"
    },
    {
      "name": "A. Pollo"
    },
    {
      "name": "M. Scodeggio"
    },
    {
      "name": "P. M. Weilbacher"
    },
    {
      "name": "S. Boissier"
    },
    {
      "name": "P. Franzetti"
    },
    {
      "name": "G. Lorenzon"
    },
    {
      "name": "A. Nanni"
    },
    {
      "name": "C. Adami"
    },
    {
      "name": "R. Gavazzi"
    },
    {
      "name": "O. Ilbert"
    },
    {
      "name": "S. Pal"
    },
    {
      "name": "N. Principi Cavaterra"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9rmqge6sc26dg.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.28109",
  "fulltext_url": null,
  "id": "9rmqge6sc26dg",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.28109",
  "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"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7204766582",
  "pdf_url": "https://arxiv.org/pdf/2608.28109",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9rmqge6sc26dg.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:14Z",
      "native_id": "2608.28109",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.28109"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Dissecting ultra-diffuse galaxies in the field",
  "title_text": "Dissecting ultra-diffuse galaxies in the field",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:14Z",
  "url": "https://research.draconitic.com/paper/9rmqge6sc26dg",
  "venue": "arXiv",
  "versions": []
}