ReveaLLAGN 0: First Look at JWST MIRI Data of Sombrero and NGC 1052

Goold, Kameron; Seth, Anil; Molina, Mallory; Ohlson, David; Runnoe, Jessie C.; Böker, Torsten; Davis, Timothy A.; Dumont, Antoine; Eracleous, Michael; Fernández-Ontiveros, Juan Antonio; Gallo, Elena; Goulding, Andy D.; Greene, Jenny E.; Ho, Luis C.; Markoff, Sera B.; Neumayer, Nadine; Plotkin, Richard M.; Prieto, Almudena; Satyapal, Shobita; van de Ven, Glenn; Walsh, Jonelle L.; Yuan, Feng; Feldmeier-Krause, Anja; Gültekin, Kayhan; Hönig, Sebastian; Kirkpatrick, Allison; Lützgendorf, Nora; Reines, Amy E.; Strader, Jay; Trump, Jonathan R.; Voggel, Karina T.
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The Astrophysical Journal

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We present the first results from the Revealing Low-Luminosity Active Galactic Nuclei (ReveaLLAGN) survey, a JWST survey of seven nearby LLAGNs. We focus on two observations with the Mid-Infrared Instrument (MIRI)'s Medium-Resolution Spectrometer of the nuclei of NGC 1052 and Sombrero (NGC 4594/M104). We also compare these data to public JWST data of higher-luminosity AGNs, NGC 7319 and NGC 7469. JWST clearly separates the AGN spectrum from the galaxy light even in Sombrero, the faintest target in our survey; the AGN components have very red spectra. We find that the emission-line widths in both NGC 1052 and Sombrero increase with increasing ionization potential, with FWHM > 1000 km s‑1 for lines with ionization potential ≳ 50 eV. These lines are also significantly blueshifted in both LLAGNs. The high-ionization-potential lines in NGC 7319 show neither broad widths nor significant blueshifts. Many of the lower-ionization-potential emission lines in Sombrero show significant blue wings extending >1000 km s‑1. These features and the emission-line maps in both galaxies are consistent with outflows along the jet direction. Sombrero has the lowest-luminosity high-ionization-potential lines ([Ne V] and [O IV]) ever measured in the mid-infrared, but the relative strengths of these lines are consistent with higher-luminosity AGNs. On the other hand, the [Ne V] emission is much weaker relative to the [Ne III] and [Ne II] lines of higher-luminosity AGNs. These initial results show the great promise that JWST holds for identifying and studying the physical nature of LLAGNs.