All Outputs (9)

An obscured quasar census with the 4MOST IR AGN survey: design, predicted properties, and scientific goals (2025)
Journal Article
Andonie, C., Alexander, D. M., Greenwell, C., Fotopoulou, S., Hickox, R., Rosario, D. J., Villforth, C., Buchner, J., Krogager, J.-K., Laloux, B., Merloni, A., Salvato, M., Streicher, O., & Yan, W. (2025). An obscured quasar census with the 4MOST IR AGN survey: design, predicted properties, and scientific goals. Monthly Notices of the Royal Astronomical Society, 539(3), 2202-2229. https://doi.org/10.1093/mnras/staf624

We present the 4MOST (4-metre Multi-Object Spectroscopic Telescope) infrared (IR) AGN survey, the first large-scale optical spectroscopic survey characterizing mid-infrared (MIR) selected obscured active galactic nuclei (AGNs). The survey targets obs... Read More about An obscured quasar census with the 4MOST IR AGN survey: design, predicted properties, and scientific goals.

Accretion properties of X-ray AGN: evidence for radiation-regulated obscuration with redshift-dependent host galaxy contribution (2024)
Journal Article
Laloux, B., Georgakakis, A., Alexander, D. M., Buchner, J., Andonie, C., Acharya, N., Aird, J., Alonso-Tetilla, A. V., Bongiorno, A., Hickox, R. C., Lapi, A., Musiimenta, B., Almeida, C. R., Villforth, C., & Shankar, F. (2024). Accretion properties of X-ray AGN: evidence for radiation-regulated obscuration with redshift-dependent host galaxy contribution. Monthly Notices of the Royal Astronomical Society, 532(3), 3459-3479. https://doi.org/10.1093/mnras/stae1649

Ionised AGN outflows in the Goldfish galaxy: The illuminating and interacting red quasar eFEDSJ091157.4+014327 at z ∼ 0.6 (2024)
Journal Article
Musiimenta, B., Speranza, G., Urrutia, T., Brusa, M., Ramos Almeida, C., Perna, M., López, I. E., Alexander, D., Laloux, B., Shankar, F., Lapi, A., Salvato, M., Toba, Y., Andonie, C., & Rodríguez, I. M. (2024). Ionised AGN outflows in the Goldfish galaxy: The illuminating and interacting red quasar eFEDSJ091157.4+014327 at z ∼ 0.6. Astronomy & Astrophysics, 687, Article A111. https://doi.org/10.1051/0004-6361/202449283

Context. Evolutionary models suggest that the initial growth phases of active galactic nuclei (AGN) and their central supermassive black holes (SMBHs) are dust-enshrouded and characterised by jet or wind outflows that should gradually clear the inter... Read More about Ionised AGN outflows in the Goldfish galaxy: The illuminating and interacting red quasar eFEDSJ091157.4+014327 at z ∼ 0.6.

Active galactic nucleus X-ray luminosity function and absorption function in the Early Universe (3 ≤ z ≤ 6) (2024)
Journal Article
Pouliasis, E., Ruiz, A., Georgantopoulos, I., Vito, F., Gilli, R., Vignali, C., …Garrel, C. (2024). Active galactic nucleus X-ray luminosity function and absorption function in the Early Universe (3 ≤ z ≤ 6). Astronomy & Astrophysics, 685, Article A97. https://doi.org/10.1051/0004-6361/202348479

The X-ray luminosity function (XLF) of active galactic nuclei (AGN) offers a robust tool to study the evolution and the growth of the supermassive black-hole population over cosmic time. Owing to the limited area probed by X-ray surveys, optical surv... Read More about Active galactic nucleus X-ray luminosity function and absorption function in the Early Universe (3 ≤ z ≤ 6).

Probing the roles of orientation and multiscale gas distributions in shaping the obscuration of active galactic nuclei through cosmic time (2023)
Journal Article
Alonso-Tetilla, A. V., Shankar, F., Fontanot, F., Menci, N., Valentini, M., Buchner, J., …Ramos Almeida, C. (2024). Probing the roles of orientation and multiscale gas distributions in shaping the obscuration of active galactic nuclei through cosmic time. Monthly Notices of the Royal Astronomical Society, 527(4), 10878-10896. https://doi.org/10.1093/mnras/stad3265

The origin of obscuration in active galactic nuclei (AGNs) is still an open debate. In particular, it is unclear what drives the relative contributions to the line-of-sight column densities from galaxy-scale and torus-linked obscuration. The latter s... Read More about Probing the roles of orientation and multiscale gas distributions in shaping the obscuration of active galactic nuclei through cosmic time.

Obscuration beyond the nucleus: infrared quasars can be buried in extreme compact starbursts (2023)
Journal Article
Andonie, C., Alexander, D. M., Greenwell, C., Puglisi, A., Laloux, B., Alonso-Tetilla, A. V., …Villforth, C. (2024). Obscuration beyond the nucleus: infrared quasars can be buried in extreme compact starbursts. Monthly Notices of the Royal Astronomical Society, 527(1), L144–L150. https://doi.org/10.1093/mnrasl/slad144

The miniJPAS survey: AGN and host galaxy coevolution of X-ray-selected sources (2023)
Journal Article
López, I. E., Brusa, M., Bonoli, S., Shankar, F., Acharya, N., Laloux, B., …Ramió, H. V. (2023). The miniJPAS survey: AGN and host galaxy coevolution of X-ray-selected sources. Astronomy & Astrophysics, 672, 1-20. https://doi.org/10.1051/0004-6361/202245168

Studies indicate strong evidence of a scaling relation in the local Universe between the supermassive black hole mass (MBH) and the stellar mass of their host galaxies (M⋆). They even show similar histories across cosmic times of their differential t... Read More about The miniJPAS survey: AGN and host galaxy coevolution of X-ray-selected sources.

The demographics of obscured AGN from X-ray spectroscopy guided by multiwavelength information (2022)
Journal Article
Laloux, B., Georgakakis, A., Andonie, C., Alexander, D. M., Ruiz, A., Rosario, D. J., Aird, J., Buchner, J., Carrera, F. J., Lapi, A., Ramos Almeida, C., Salvato, M., & Shankar, F. (2023). The demographics of obscured AGN from X-ray spectroscopy guided by multiwavelength information. Monthly Notices of the Royal Astronomical Society, 518(2), 2546-2566. https://doi.org/10.1093/mnras/stac3255

A complete census of active galactic nuclei (AGNs) is a prerequisite for understanding the growth of supermassive black holes across cosmic time. A significant challenge towards this goal is the whereabouts of heavily obscured AGN that remain uncerta... Read More about The demographics of obscured AGN from X-ray spectroscopy guided by multiwavelength information.

Towards modelling ghostly damped Ly αs (2021)
Journal Article
Laloux, B., & Petitjean, P. (2021). Towards modelling ghostly damped Ly αs. Monthly Notices of the Royal Astronomical Society, 502(3), 3855-3869. https://doi.org/10.1093/mnras/stab173

We use simple models of the spatial structure of the quasar broad-line region (BLR) to investigate the properties of so-called ghostly damped Ly α (DLA) systems detected in Sloan Digital Sky Survey (SDSS) data. These absorbers are characterized by th... Read More about Towards modelling ghostly damped Ly αs.