ReveaLLAGN 1: JWST Emission-Line Spectra Reveal Low-Luminosity AGN with UV-Deficient SEDs and Warm Molecular Gas
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2026
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| author | Goold, Kameron Seth, Anil Molina, Mallory Ohlson, David Acharya, Nischal Böker, Torsten Dumont, Antoine Eracleous, Michael Feldmeier-Krause, Anja Fernández-Ontiveros, Juan Antonio Gallo, Elena Goulding, Andy D. Gültekin, Kayhan Ho, Luis C. Neumayer, Nadine Plotkin, Richard M. Prieto, Almudena Runnoe, Jessie C. Satyapal, Shobita van de Ven, Glenn Walsh, Jonelle L. Yuan, Feng Lützgendorf, Nora |
| author_facet | Goold, Kameron Seth, Anil Molina, Mallory Ohlson, David Acharya, Nischal Böker, Torsten Dumont, Antoine Eracleous, Michael Feldmeier-Krause, Anja Fernández-Ontiveros, Juan Antonio Gallo, Elena Goulding, Andy D. Gültekin, Kayhan Ho, Luis C. Neumayer, Nadine Plotkin, Richard M. Prieto, Almudena Runnoe, Jessie C. Satyapal, Shobita van de Ven, Glenn Walsh, Jonelle L. Yuan, Feng Lützgendorf, Nora |
| contents | We present near- and mid-infrared spectra of eight Low-Luminosity Active Galactic Nuclei (LLAGN), spanning nearly four orders of magnitude in black hole mass and Eddington ratio, obtained with JWST/NIRSpec and MIRI as part of the ReveaLLAGN program along with identical archival data of Cen A. The high spatial resolution of JWST cleanly separates AGN emission from host-galaxy contamination, enabling detections of high-ionization potential lines more than an order of magnitude fainter than previously measured. Emission-line diagnostics reveal a transition at log($L_{bol}/L_{Edd}$) ~ -3.5, where the spectral energy distribution becomes increasingly deficient in ultraviolet photons. We find that rotational H$_2$ excitation temperatures are elevated (~500 K higher) compared to both higher-luminosity AGN and star-forming galaxies, while the H$_2$(0-0)S(3)/PAH$_{11.3 μm}$ ratios are consistent with those observed in the AGN population. We discuss the possible roles of outflows, jets, and X-ray dominated regions in shaping the interstellar medium surrounding LLAGN. Silicate emission at ~10 $μ$m, localized to the nuclear region, is detected in most ReveaLLAGN targets. This dataset offers the first comprehensive JWST-based characterization of infrared emission lines in the nuclear regions of LLAGN. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16977 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | ReveaLLAGN 1: JWST Emission-Line Spectra Reveal Low-Luminosity AGN with UV-Deficient SEDs and Warm Molecular Gas Goold, Kameron Seth, Anil Molina, Mallory Ohlson, David Acharya, Nischal Böker, Torsten Dumont, Antoine Eracleous, Michael Feldmeier-Krause, Anja Fernández-Ontiveros, Juan Antonio Gallo, Elena Goulding, Andy D. Gültekin, Kayhan Ho, Luis C. Neumayer, Nadine Plotkin, Richard M. Prieto, Almudena Runnoe, Jessie C. Satyapal, Shobita van de Ven, Glenn Walsh, Jonelle L. Yuan, Feng Lützgendorf, Nora Astrophysics of Galaxies We present near- and mid-infrared spectra of eight Low-Luminosity Active Galactic Nuclei (LLAGN), spanning nearly four orders of magnitude in black hole mass and Eddington ratio, obtained with JWST/NIRSpec and MIRI as part of the ReveaLLAGN program along with identical archival data of Cen A. The high spatial resolution of JWST cleanly separates AGN emission from host-galaxy contamination, enabling detections of high-ionization potential lines more than an order of magnitude fainter than previously measured. Emission-line diagnostics reveal a transition at log($L_{bol}/L_{Edd}$) ~ -3.5, where the spectral energy distribution becomes increasingly deficient in ultraviolet photons. We find that rotational H$_2$ excitation temperatures are elevated (~500 K higher) compared to both higher-luminosity AGN and star-forming galaxies, while the H$_2$(0-0)S(3)/PAH$_{11.3 μm}$ ratios are consistent with those observed in the AGN population. We discuss the possible roles of outflows, jets, and X-ray dominated regions in shaping the interstellar medium surrounding LLAGN. Silicate emission at ~10 $μ$m, localized to the nuclear region, is detected in most ReveaLLAGN targets. This dataset offers the first comprehensive JWST-based characterization of infrared emission lines in the nuclear regions of LLAGN. |
| title | ReveaLLAGN 1: JWST Emission-Line Spectra Reveal Low-Luminosity AGN with UV-Deficient SEDs and Warm Molecular Gas |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.16977 |