Accès ouvert
2026
article
OpenAlex
R. Silver, N. Torres-Albà, S. Marchesi, Vittoria Elvezia Gianolli et autres
Abstract This work discusses the broadband X-ray spectral analysis of 11 candidate heavily obscured active galactic nuclei (AGN) selected based on their infrared and X-ray properties by a recently published machine learning algorithm. This paper is part of a larger work to …
us, it
(code pays fourni par la source)
Accès ouvert
2025
article
OpenAlex
D. Sengupta, Núria Torres-Albà, A. Pizzetti, I. E. López et autres
Most of the supermassive black holes in the Universe accrete material in an obscured phase. While it is commonly accepted that the “dusty torus” is responsible for the nuclear obscuration, its geometrical, physical, and chemical properties are far from being properly understood. …
us, it, cl, Afrique du Sud
(code pays fourni par la source)
Accès ouvert
2025
preprint
OpenAlex
Núria Torres-Albà, Zhensong Hu, I. Cox, S. Marchesi et autres
We present the analysis of 15 X-ray observations of Mrk 477, a nearby Seyfert 2 active galactic nucleus, with the objective to monitor its obscuring column density variability. The full dataset consists of five archival observations, split into two XMM-Newton, two NuSTAR …
Accès ouvert
2024
preprint
OpenAlex
D. Sengupta, Núria Torres-Albà, A. Pizzetti, I. E. López et autres
Most of the super-massive black holes in the Universe accrete material in an obscured phase. While it is commonly accepted that the "dusty torus" is responsible for the nuclear obscuration, its geometrical, physical, and chemical properties are far from being properly understood. …
Accès ouvert
2022
preprint
OpenAlex
Yong Sheng, M. Rajagopal, A. Kaur, M. Ajello et autres
BL Lacertae (BL Lac) objects are a subclass of blazar, distinguished by their featureless optical spectrum. The featureless spectrum presents a challenge in measuring the redshift of the BL Lacs. In this paper, we measure the redshift of BL Lacs using the …