A Mid-IR comparative analysis of the Seyfert galaxies NGC 7213 and NGC 1386

Abstract

New Gemini mid-infrared spectroscopic observations together with Spitzer Space telescope archival data, are used to study the properties of the dusty torus and circumnuclear star formation in the active galaxies NGC 7213 and NGC 1386. Our main conclusions can be summarised as follows. Polycyclic aromatic hydrocarbon (PAH) emission is absent in the T-ReCS nuclear spectra but is ubiquitous in the data from Spitzer at distances above 100 pc. Star formation rates surface densities are estimated from the 12.8 $\mu m$ [Ne{\sc ii}] line strengths leading to values close to 0.1M${}_{\odot }{\mathrm{yr}}^{-1}{\mathrm{kpc}}^{-2}$. Analogous estimates based on photometric fluxes of IRAC's 8 $\mu m$ images are higher by a factor of almost 15, which could be linked to excitation of PAH molecules by older stellar populations. T-ReCS high spatial resolution data reveal silicate absorption at $\lambda$ 9.7 $\mu m$ in the central tens of parsecs of the Seyfert 2 NGC 1386, and silicate emission in the Seyfert 1 galaxy NGC 7213. In the case of NGC 1386 this feature is confined to the inner 20 pc, implying that the silicate might be linked to the putative dusty torus. Finally, by fitting CLUMPY models to the T-ReCS nuclear spectra we estimate the torus physical properties for both galaxies, finding line of sight inclinations consistent with the AGN unified model.

10 pages, 7 figures

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• The complex gas kinematics in the nucleus of the Seyfert 2 galaxy NGC 1386: rotation, outflows and inflows
• Are there reliable methods to estimate the nuclear orientation of Seyfert galaxies?
• The Galaxy Activity, Torus and Outflow Survey (GATOS): II. Torus and polar dust emission in nearby Seyfert galaxies
• Self-consistent 2-phase AGN torus models: SED library for observers
• AGN Coronae Through A Jet Perspective
• The Galaxy Activity, Torus, and Outflow Survey (GATOS). V: Unveiling PAH survival and resilience in the circumnuclear regions of AGN with JWST
• The nuclear and extended mid-infrared emission of Seyfert galaxies
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• The relationship between X-ray and optical absorbers in active galactic nuclei
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• The Ionization and Destruction of Polycyclic Aromatic Hydrocarbons in Powerful Quasars
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• The infrared to X-ray correlation spectra of unobscured type 1 active galactic nuclei
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• A deep look at the nuclear region of UGC 5101 through high angular resolution mid-IR data with GTC/CanariCam
• A decades-long fast-rise-exponential-decay flare in low-luminosity AGN NGC 7213
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• Profile comparison of the 6-9 $\mu$m polycyclic aromatic hydrocarbon bands in starburst-dominated galaxies
• Polycyclic aromatic hydrocarbons and the ionized gas
• Silicate emission in a type-2 quasar: JWST/MIRI constraints on torus geometry and radiative feedback
• Variations in the 6.2 $\mu$m polycyclic aromatic hydrocarbon band in Active Galactic Nuclei- and Starburst-dominated galaxies