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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.

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.

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., …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.

A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems (2022)
Journal Article
Andonie, C., Alexander, D. M., Rosario, D., Laloux, B., Georgakakis, A., Morabito, L. K., …Shankar, F. (2022). A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems. Monthly Notices of the Royal Astronomical Society, 517(2), 2577-2598. https://doi.org/10.1093/mnras/stac2800

To understand the active galactic nuclei (AGNs) phenomenon and their impact on the evolution of galaxies, a complete AGN census is required; however, finding heavily obscured AGNs is observationally challenging. Here we use the deep and extensive mul... Read More about A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems.

Localizing narrow Fe Kα emission within bright AGN (2022)
Journal Article
Andonie, C., Bauer, F. E., Carraro, R., Arévalo, P., Alexander, D. M., Brandt, W. N., …Treister, E. (2022). Localizing narrow Fe Kα emission within bright AGN. Astronomy & Astrophysics, 664, https://doi.org/10.1051/0004-6361/202142473

Context. The 6.4 keV Fe Kα emission line is a ubiquitous feature in X-ray spectra of active galactic nuclei (AGN), and its properties track the interaction between the variable primary X-ray continuum and the surrounding structure from which it arise... Read More about Localizing narrow Fe Kα emission within bright AGN.

A multiwavelength-motivated X-ray model for the Circinus Galaxy (2022)
Journal Article
Andonie, C., Ricci, C., Paltani, S., Arévalo, P., Treister, E., Bauer, F., & Stalevski, M. (2022). A multiwavelength-motivated X-ray model for the Circinus Galaxy. Monthly Notices of the Royal Astronomical Society, 511(4), 5768-5781. https://doi.org/10.1093/mnras/stac403

Reprocessed X-ray emission in active galactic nuclei can provide fundamental information about the circumnuclear environments of supermassive black holes. Recent mid-infrared studies have shown evidence of an extended dusty structure perpendicular to... Read More about A multiwavelength-motivated X-ray model for the Circinus Galaxy.