Optical and mid-infrared line emission in nearby Seyfert galaxies

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dc.contributor.authorFeltre, Anna
dc.contributor.authorGruppioni, Carlotta
dc.contributor.authorMarchetti, Lucia
dc.contributor.authorMahoro, Antoine
dc.contributor.authorSalvestrini, Francesco
dc.contributor.authorMignoli, Marco
dc.contributor.authorBisigello, Laura
dc.contributor.authorCalura, Francesco
dc.contributor.authorCharlot, Stephane
dc.contributor.authorChevallard, Jacopo
dc.contributor.authorRomero-Colmenero, Encarni
dc.contributor.authorCurtis-Lake, Emma
dc.contributor.authorDelvecchio, Ivan
dc.contributor.authorDors Junior, Oli Luiz
dc.contributor.authorHirschmann, Michaela
dc.contributor.authorJarrett, Thomas
dc.contributor.authorMoloko, Malebo E.
dc.contributor.authorPlat, Adèle
dc.contributor.authorPozzi, F.
dc.contributor.authorSefako, Ramotholo
dc.contributor.authorTraina, A.
dc.contributor.authorVaccari, Mattia
dc.contributor.authorVäisänen, Pauli
dc.contributor.authorVallini, Livia
dc.contributor.authorVidal-García, Alba
dc.contributor.authorVignali, Cristian
dc.date.accessioned2025-02-27T13:20:51Z
dc.date.available2025-02-27T13:20:51Z
dc.date.issued22023
dc.description.abstractLine ratio diagnostics provide valuable clues as to the source of ionizing radiation in galaxies with intense black hole accretion and starbursting events, such as local Seyfert galaxies or galaxies at the peak of their star formation history. We aim to provide a reference joint optical and mid-IR line ratio analysis for studying active galactic nucleus (AGN) identification via line-ratio diagnostics and testing predictions from photoionization models. We first obtained homogenous optical spectra with the Southern Africa Large Telescope for 42 Seyfert galaxies with available Spitzer/IRS spectroscopy, along with X-ray to mid-IR multiband data. After confirming the power of the main optical ([O III]λ5007) and mid-IR ([Ne V]14.3 μm, [O IV]25.9 μm, [Ne III]15.7 μm) emission lines in tracing AGN activity, we explored diagrams based on ratios of optical and mid-IR lines by exploiting photoionization models of different ionizing sources (AGN, star formation, and shocks). We find that pure AGN photoionization models are good at reproducing observations of Seyfert galaxies with an AGN fractional contribution to the mid-IR (5 − 40 μm) continuum emission larger than 50 per cent. For targets with a lower AGN contribution, even assuming a hard ionizing field from the central accretion disk (Fν ∝ να, with α ≈ −0.9), these same models do not fully reproduce the observed mid-IR line ratios. Mid-IR line ratios such as [Ne V]14.3 μm/[Ne II]12.8 μm, [O IV]25.9 μm/[Ne II]12.8 μm, and [Ne III]15.7 μm/[Ne II]12.8 μm show a dependence on the AGN fractional contribution to the mid-IR, unlike optical line ratios. An additional source of ionization, either from star formation or radiative shocks, can help explain the observations in the mid-IR. While mid-IR line ratios are good tracers of the AGN activity versus star formation, among the combinations of optical and mid-IR diagnostics in line-ratio diagrams, only those involving the [O I]/Hα ratio are promising diagnostics for simultaneously unraveling the relative roles of AGN, star formation, and shocks. A proper identification of the dominant source of ionizing photons would require the exploitation of analysis tools based on advanced statistical techniques as well as spatially resolved data.
dc.description.physical29 p.
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.mimetypePDF
dc.identifier.affiliationOsservatorio di Astrofisica e Scienza dello Spazio di Bologna
dc.identifier.affiliationUniversity of Cape Town
dc.identifier.affiliationIstituto di Radioastronomia
dc.identifier.affiliationSouth African Astronomical Observatory
dc.identifier.affiliationOsservatorio Astrofisico di Arcetri
dc.identifier.affiliationUniversitá di Padova
dc.identifier.affiliationOsservatorio astronomico di Padova
dc.identifier.affiliationInstitut d’Astrophysique de Paris
dc.identifier.affiliationUniversity of Oxford
dc.identifier.affiliationSouthern African Large Telescope
dc.identifier.affiliationUniversity of Hertfordshire
dc.identifier.affiliationOsservatorio Astronomico di Brera
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationÉcole Polytechnique Fédérale de Lausanne
dc.identifier.affiliationOsservatorio Astronomico di Trieste
dc.identifier.affiliationClemson University
dc.identifier.affiliationUniversity of Arizona
dc.identifier.affiliationUniversitá degli Studi di Bologna
dc.identifier.affiliationUniversity of the Western Cape
dc.identifier.affiliationScuola Normale Superiore
dc.identifier.affiliationObservatorio Astronómico Nacional
dc.identifier.affiliationUniversité de Paris
dc.identifier.bibliographicCitationFELTRE, Anna et al. Optical and mid-infrared line emission in nearby Seyfert galaxies. Astronomy & Astrophysics, v. 675, p. 1-29, 2023. Disponível em: https://www.aanda.org/10.1051/0004-6361/202245516
dc.identifier.doi10.1051/0004-6361/202245516
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/596
dc.language.isoen_US
dc.publisherEDP Sciences
dc.rights.holderAnna Feltre et al.
dc.subject.keywordGalaxies: active
dc.subject.keywordGalaxies: Seyfert
dc.subject.keywordGalaxies: starburst
dc.subject.keywordGalaxies: ISM
dc.subject.keywordGalaxy: evolution
dc.subject.keywordInfrared: ISM
dc.titleOptical and mid-infrared line emission in nearby Seyfert galaxies
dc.typeArtigos de Periódicos

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