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• W2768004133 endingPage "A46" @default.
• W2768004133 startingPage "A46" @default.
• W2768004133 abstract "[Abridged] Methods: We use interferometric observations in the $N$-band with VLTI/MIDI to resolve the mid-IR nucleus of IC 3639. The origin of the nuclear infrared emission is determined from: 1) the comparison of the correlated fluxes from VLTI/MIDI with the fluxes measured at subarcsec resolution (VLT/VISIR, VLT/ISAAC); 2) diagnostics based on IR fine-structure line ratios, the IR continuum emission, IR bands produced by polycyclic aromatic hydrocarbons (PAH) and silicates; and 3) the high-angular resolution spectral energy distribution. Results: The unresolved flux of IC 3639 is $90 pm 20, rm{mJy}$ at $10.5, rm{mu m}$, measured with three different baselines in VLTI (UT1-UT2, UT3-UT4, and UT2-UT3; $46$-$58, rm{m}$), making this the faintest measurement so far achieved with mid-IR interferometry. The correlated flux is a factor of $3$-$4$ times fainter than the VLT/VISIR total flux measurement. The observations suggest that most of the mid-IR emission has its origin on spatial scales between $10$ and $80, rm{pc}$ ($40$-$340, rm{mas}$). A composite scenario where the star formation component dominates over the AGN is favoured by the diagnostics based on ratios of IR fine-structure emission lines, the shape of the IR continuum, and the PAH and silicate bands. Conclusions: A composite AGN-starburst scenario is able to explain both the mid-IR brightness distribution and the IR spectral properties observed in the nucleus of IC 3639. The nuclear starburst would dominate the mid-IR emission and the ionisation of low-excitation lines (e.g. [NeII]$_{12.8 rm{mu m}}$) with a net contribution of $sim 70%$. The AGN accounts for the remaining $sim 30%$ of the mid-IR flux, ascribed to the unresolved component in the MIDI observations, and the ionisation of high-excitation lines (e.g. [NeV]$_{14.3 rm{mu m}}$ and [OIV]$_{25.9 rm{mu m}}$)." @default.
• W2768004133 created "2017-11-17" @default.
• W2768004133 creator A5010006928 @default.
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• W2768004133 creator A5071659495 @default.
• W2768004133 creator A5078790470 @default.
• W2768004133 date "2018-03-01" @default.
• W2768004133 modified "2023-09-24" @default.
• W2768004133 title "Embedded AGN and star formation in the central 80 pc of IC 3639" @default.
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• W2768004133 doi "https://doi.org/10.1051/0004-6361/201731906" @default.
• W2768004133 hasPublicationYear "2018" @default.
• W2768004133 type Work @default.

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