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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Accès en ligne: | https://arxiv.org/abs/2504.01852 |
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| author | Rinaldi, Pierluigi Pérez-González, Pablo G. Rieke, George H. Lyu, Jianwei D'Eugenio, Francesco Wu, Zihao Carniani, Stefano Looser, Tobias J. Shivaei, Irene Boogaard, Leindert A. Diaz-Santos, Tanio Colina, Luis Östlin, Göran Alberts, Stacey Álvarez-Márquez, Javier Annuziatella, Marianna Aravena, Manuel Bhatawdekar, Rachana Bunker, Andrew J. Caputi, Karina I. Charlot, Stéphane Gómez, Alejandro Crespo Curti, Mirko Eckart, Andreas Gillman, Steven Hainline, Kevin Kumari, Nimisha Hjorth, Jens Iani, Edoardo Inami, Hanae Ji, Zhiyuan Johnson, Benjamin D. Jones, Gareth C. Labiano, Álvaro Maiolino, Roberto Melinder, Jens Moutard, Thibaud Peißker, Florian Rieke, Marcia Robertson, Brant Scholtz, Jan Tacchella, Sandro van der Werf, Paul P. Walter, Fabian Williams, Christina C. Willott, Chris Witstok, Joris Übler, Hannah Zhu, Yongda |
| author_facet | Rinaldi, Pierluigi Pérez-González, Pablo G. Rieke, George H. Lyu, Jianwei D'Eugenio, Francesco Wu, Zihao Carniani, Stefano Looser, Tobias J. Shivaei, Irene Boogaard, Leindert A. Diaz-Santos, Tanio Colina, Luis Östlin, Göran Alberts, Stacey Álvarez-Márquez, Javier Annuziatella, Marianna Aravena, Manuel Bhatawdekar, Rachana Bunker, Andrew J. Caputi, Karina I. Charlot, Stéphane Gómez, Alejandro Crespo Curti, Mirko Eckart, Andreas Gillman, Steven Hainline, Kevin Kumari, Nimisha Hjorth, Jens Iani, Edoardo Inami, Hanae Ji, Zhiyuan Johnson, Benjamin D. Jones, Gareth C. Labiano, Álvaro Maiolino, Roberto Melinder, Jens Moutard, Thibaud Peißker, Florian Rieke, Marcia Robertson, Brant Scholtz, Jan Tacchella, Sandro van der Werf, Paul P. Walter, Fabian Williams, Christina C. Willott, Chris Witstok, Joris Übler, Hannah Zhu, Yongda |
| contents | We present a comprehensive analysis of the MIRI Extremely Red Object Virgil, a Lyman-$α$ emitter at $z_{spec} = 6.6379 \pm 0.0035$ with the photometric properties of a Little Red Dot. Leveraging new JWST/MIRI imaging from the MIDIS and PAHSPECS programs, we confirm Virgil's extraordinary nature among galaxies in JADES/GOODS-South, exhibiting a strikingly red NIRCam-to-MIRI color (F444W $-$ F1500W = $2.84\pm0.04$ mag). Deep NIRSpec/PRISM spectroscopy from the OASIS program offers key insights into the host galaxy, revealing properties of an average star-forming galaxy during Cosmic Reionization, such as a subsolar metallicity, low-to-moderate dust content, and a relatively high ionization parameter and electron temperature. By estimating the star formation rate of Virgil from UV and H$α$, we find evidence that the galaxy is either entering or fading out of a bursty episode. Although line-ratio diagnostics employed at high-$z$ would classify Virgil as an Active Galactic Nucleus (AGN), this classification becomes ambiguous once redshift evolution is considered. Nonetheless, Virgil occupies the same parameter space as recently confirmed AGNs at similar redshifts. The new deep MIRI data at 15 $μ$m reinforce the AGN nature of Virgil, as inferred from multiple spectral energy distribution (SED) fitting codes. Virgil's rising infrared SED and UV excess resemble those of Dust-Obscured Galaxies (DOGs) studied with Spitzer at Cosmic Noon, particularly blue-excess HotDOGs. Our results highlight the need for a multi-wavelength approach incorporating MIRI to uncover such extreme sources at $z\gtrsim6$ and to shed light on the interplay between galaxy evolution and early black hole growth during Cosmic Reionization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_01852 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Deciphering the Nature of Virgil: An Obscured AGN Lurking Within an Apparently Normal Lyman-α Emitter During Cosmic Reionization Rinaldi, Pierluigi Pérez-González, Pablo G. Rieke, George H. Lyu, Jianwei D'Eugenio, Francesco Wu, Zihao Carniani, Stefano Looser, Tobias J. Shivaei, Irene Boogaard, Leindert A. Diaz-Santos, Tanio Colina, Luis Östlin, Göran Alberts, Stacey Álvarez-Márquez, Javier Annuziatella, Marianna Aravena, Manuel Bhatawdekar, Rachana Bunker, Andrew J. Caputi, Karina I. Charlot, Stéphane Gómez, Alejandro Crespo Curti, Mirko Eckart, Andreas Gillman, Steven Hainline, Kevin Kumari, Nimisha Hjorth, Jens Iani, Edoardo Inami, Hanae Ji, Zhiyuan Johnson, Benjamin D. Jones, Gareth C. Labiano, Álvaro Maiolino, Roberto Melinder, Jens Moutard, Thibaud Peißker, Florian Rieke, Marcia Robertson, Brant Scholtz, Jan Tacchella, Sandro van der Werf, Paul P. Walter, Fabian Williams, Christina C. Willott, Chris Witstok, Joris Übler, Hannah Zhu, Yongda Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present a comprehensive analysis of the MIRI Extremely Red Object Virgil, a Lyman-$α$ emitter at $z_{spec} = 6.6379 \pm 0.0035$ with the photometric properties of a Little Red Dot. Leveraging new JWST/MIRI imaging from the MIDIS and PAHSPECS programs, we confirm Virgil's extraordinary nature among galaxies in JADES/GOODS-South, exhibiting a strikingly red NIRCam-to-MIRI color (F444W $-$ F1500W = $2.84\pm0.04$ mag). Deep NIRSpec/PRISM spectroscopy from the OASIS program offers key insights into the host galaxy, revealing properties of an average star-forming galaxy during Cosmic Reionization, such as a subsolar metallicity, low-to-moderate dust content, and a relatively high ionization parameter and electron temperature. By estimating the star formation rate of Virgil from UV and H$α$, we find evidence that the galaxy is either entering or fading out of a bursty episode. Although line-ratio diagnostics employed at high-$z$ would classify Virgil as an Active Galactic Nucleus (AGN), this classification becomes ambiguous once redshift evolution is considered. Nonetheless, Virgil occupies the same parameter space as recently confirmed AGNs at similar redshifts. The new deep MIRI data at 15 $μ$m reinforce the AGN nature of Virgil, as inferred from multiple spectral energy distribution (SED) fitting codes. Virgil's rising infrared SED and UV excess resemble those of Dust-Obscured Galaxies (DOGs) studied with Spitzer at Cosmic Noon, particularly blue-excess HotDOGs. Our results highlight the need for a multi-wavelength approach incorporating MIRI to uncover such extreme sources at $z\gtrsim6$ and to shed light on the interplay between galaxy evolution and early black hole growth during Cosmic Reionization. |
| title | Deciphering the Nature of Virgil: An Obscured AGN Lurking Within an Apparently Normal Lyman-α Emitter During Cosmic Reionization |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2504.01852 |