JADES and BlackTHUNDER: rest-frame Balmer-line absorption and the local environment in a Little Red Dot at z = 5
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2025
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| author | D'Eugenio, Francesco Juodžbalis, Ignas Ji, Xihan Scholtz, Jan Maiolino, Roberto Carniani, Stefano Perna, Michele Mazzolari, Giovanni Übler, Hannah Arribas, Santiago Bhatawdekar, Rachana Bunker, Andrew J. Cresci, Giovanni Curtis-Lake, Emma Hainline, Kevin Inayoshi, Kohei Isobe, Yuki Johnson, Benjamin D. Jones, Gareth C. Looser, Tobias J. Nelson, Erica J. Parlanti, Eleonora Puskás, Dávid Rinaldi, Pierluigi Robertson, Brant Del Pino, Bruno Rodríguez Shivaei, Irene Sun, Fengwu Tacchella, Sandro Venturi, Giacomo Volonteri, Marta Williams, Christina C. Willmer, Christopher N. A. Willott, Chris Witstok, Joris |
| author_facet | D'Eugenio, Francesco Juodžbalis, Ignas Ji, Xihan Scholtz, Jan Maiolino, Roberto Carniani, Stefano Perna, Michele Mazzolari, Giovanni Übler, Hannah Arribas, Santiago Bhatawdekar, Rachana Bunker, Andrew J. Cresci, Giovanni Curtis-Lake, Emma Hainline, Kevin Inayoshi, Kohei Isobe, Yuki Johnson, Benjamin D. Jones, Gareth C. Looser, Tobias J. Nelson, Erica J. Parlanti, Eleonora Puskás, Dávid Rinaldi, Pierluigi Robertson, Brant Del Pino, Bruno Rodríguez Shivaei, Irene Sun, Fengwu Tacchella, Sandro Venturi, Giacomo Volonteri, Marta Williams, Christina C. Willmer, Christopher N. A. Willott, Chris Witstok, Joris |
| contents | We present a broad-line AGN at z=5.077, observed with both NIRSpec/MSA and NIRSpec/IFU by the JADES and BlackTHUNDER surveys. The target exhibits all the hallmark features of a 'Little Red Dot' (LRD) AGN. The combination of spatially resolved and high-resolution spectroscopy offers deeper insight into its nature. The H$α$ line has multiple components, including two broad Gaussians, yielding a black-hole mass of $\log(M_{\rm BH}/M_\odot)=7.65$, while the narrow [O III]$λ$5007 gives a galaxy dynamical mass of $\log(M_{\rm dyn}/M_\odot)=9.1$ suggesting a dynamically overmassive black hole relative to the host galaxy. The target is immersed in a 7-kpc wide pool of ionized gas and has three neighbours: a satellite galaxy, a possible satellite/gas cloud and a tentatively detected spatially detached outflow. H$α$ shows strong absorption, deeper than the continuum, thus ruling out a stellar origin, and with velocity and velocity dispersion of v=-13 km s$^{-1}$ and $σ$=120 km s$^{-1}$. There is tentative evidence (2.6 $σ$) of temporal variability in the EW of the H$α$ absorber over two rest-frame months. If confirmed, this would suggest a highly dynamic environment. Notably, while the H$α$ absorber is clearly visible and even dominant in the high-resolution G395H observations, it is not detected in the medium-resolution G395M data of the same epoch. This implies that the current incidence rate of absorbers in LRDs - and especially of rest-frame absorbers - may be severely underestimated, because most LRDs rely on lower-resolution spectroscopy. In this context, the high incidence rate of rest-frame absorbers in LRDs may indicate a configuration that is either intrinsically stationary, such as a rotating disc, or that exhibits time-averaged stability, such as an oscillatory 'breathing mode' accretion of cyclic expansion and contraction of the gas around the SMBH. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_14870 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | JADES and BlackTHUNDER: rest-frame Balmer-line absorption and the local environment in a Little Red Dot at z = 5 D'Eugenio, Francesco Juodžbalis, Ignas Ji, Xihan Scholtz, Jan Maiolino, Roberto Carniani, Stefano Perna, Michele Mazzolari, Giovanni Übler, Hannah Arribas, Santiago Bhatawdekar, Rachana Bunker, Andrew J. Cresci, Giovanni Curtis-Lake, Emma Hainline, Kevin Inayoshi, Kohei Isobe, Yuki Johnson, Benjamin D. Jones, Gareth C. Looser, Tobias J. Nelson, Erica J. Parlanti, Eleonora Puskás, Dávid Rinaldi, Pierluigi Robertson, Brant Del Pino, Bruno Rodríguez Shivaei, Irene Sun, Fengwu Tacchella, Sandro Venturi, Giacomo Volonteri, Marta Williams, Christina C. Willmer, Christopher N. A. Willott, Chris Witstok, Joris Astrophysics of Galaxies We present a broad-line AGN at z=5.077, observed with both NIRSpec/MSA and NIRSpec/IFU by the JADES and BlackTHUNDER surveys. The target exhibits all the hallmark features of a 'Little Red Dot' (LRD) AGN. The combination of spatially resolved and high-resolution spectroscopy offers deeper insight into its nature. The H$α$ line has multiple components, including two broad Gaussians, yielding a black-hole mass of $\log(M_{\rm BH}/M_\odot)=7.65$, while the narrow [O III]$λ$5007 gives a galaxy dynamical mass of $\log(M_{\rm dyn}/M_\odot)=9.1$ suggesting a dynamically overmassive black hole relative to the host galaxy. The target is immersed in a 7-kpc wide pool of ionized gas and has three neighbours: a satellite galaxy, a possible satellite/gas cloud and a tentatively detected spatially detached outflow. H$α$ shows strong absorption, deeper than the continuum, thus ruling out a stellar origin, and with velocity and velocity dispersion of v=-13 km s$^{-1}$ and $σ$=120 km s$^{-1}$. There is tentative evidence (2.6 $σ$) of temporal variability in the EW of the H$α$ absorber over two rest-frame months. If confirmed, this would suggest a highly dynamic environment. Notably, while the H$α$ absorber is clearly visible and even dominant in the high-resolution G395H observations, it is not detected in the medium-resolution G395M data of the same epoch. This implies that the current incidence rate of absorbers in LRDs - and especially of rest-frame absorbers - may be severely underestimated, because most LRDs rely on lower-resolution spectroscopy. In this context, the high incidence rate of rest-frame absorbers in LRDs may indicate a configuration that is either intrinsically stationary, such as a rotating disc, or that exhibits time-averaged stability, such as an oscillatory 'breathing mode' accretion of cyclic expansion and contraction of the gas around the SMBH. |
| title | JADES and BlackTHUNDER: rest-frame Balmer-line absorption and the local environment in a Little Red Dot at z = 5 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2506.14870 |