Tracing AGN-Galaxy Co-Evolution with UV Line-Selected Obscured AGN
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2025
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| author | Barchiesi, Luigi Marchetti, Lucia Vaccari, Mattia Vignali, Cristian Pozzi, Francesca Prandoni, Isabella Gilli, Roberto Mignoli, Marco Afonso, Jose Singh, Veeresh Hale, Catherine Heywood, Ian Jarvis, Matt Whittam, Imogen |
| author_facet | Barchiesi, Luigi Marchetti, Lucia Vaccari, Mattia Vignali, Cristian Pozzi, Francesca Prandoni, Isabella Gilli, Roberto Mignoli, Marco Afonso, Jose Singh, Veeresh Hale, Catherine Heywood, Ian Jarvis, Matt Whittam, Imogen |
| contents | Understanding black hole-galaxy co-evolution and the role of AGN feedback requires complete AGN samples, including heavily obscured systems. In this work, we present the first UV line-selected ([Nev]3426 and CIV1549) sample of obscured AGN with full X-ray-to-radio coverage, assembled by combining data from the Chandra COSMOS Legacy survey, the COSMOS2020 catalogue, IR photometry from XID+, and radio observations from the VLA and MIGHTEE surveys. Using CIGALE to perform spectral energy distribution (SED) fitting, we analyse 184 obscured AGN at 0.6 < z < 1.2 and 1.5 < z < 3.1, enabling detailed measurements of AGN and host galaxy properties, and direct comparison with SIMBA hydrodynamical simulations. We find that X-ray and radio data are essential for accurate SED fits, with the radio band proving critical when X-ray detections are missing or in cases of poor IR coverage. Comparisons with matched non-active galaxies and simulations suggest that the [NeV]-selected sources are in a pre-quenching stage, while the CIV-selected ones are likely quenched by AGN activity. Our results indicate that [NeV] and CIV selections target galaxies in a transient phase of their co-evolution, characterised by intense, obscured accretion, and pave the way for future extensions with upcoming large area high-z spectroscopic surveys. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_19602 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tracing AGN-Galaxy Co-Evolution with UV Line-Selected Obscured AGN Barchiesi, Luigi Marchetti, Lucia Vaccari, Mattia Vignali, Cristian Pozzi, Francesca Prandoni, Isabella Gilli, Roberto Mignoli, Marco Afonso, Jose Singh, Veeresh Hale, Catherine Heywood, Ian Jarvis, Matt Whittam, Imogen Astrophysics of Galaxies High Energy Astrophysical Phenomena Understanding black hole-galaxy co-evolution and the role of AGN feedback requires complete AGN samples, including heavily obscured systems. In this work, we present the first UV line-selected ([Nev]3426 and CIV1549) sample of obscured AGN with full X-ray-to-radio coverage, assembled by combining data from the Chandra COSMOS Legacy survey, the COSMOS2020 catalogue, IR photometry from XID+, and radio observations from the VLA and MIGHTEE surveys. Using CIGALE to perform spectral energy distribution (SED) fitting, we analyse 184 obscured AGN at 0.6 < z < 1.2 and 1.5 < z < 3.1, enabling detailed measurements of AGN and host galaxy properties, and direct comparison with SIMBA hydrodynamical simulations. We find that X-ray and radio data are essential for accurate SED fits, with the radio band proving critical when X-ray detections are missing or in cases of poor IR coverage. Comparisons with matched non-active galaxies and simulations suggest that the [NeV]-selected sources are in a pre-quenching stage, while the CIV-selected ones are likely quenched by AGN activity. Our results indicate that [NeV] and CIV selections target galaxies in a transient phase of their co-evolution, characterised by intense, obscured accretion, and pave the way for future extensions with upcoming large area high-z spectroscopic surveys. |
| title | Tracing AGN-Galaxy Co-Evolution with UV Line-Selected Obscured AGN |
| topic | Astrophysics of Galaxies High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2511.19602 |