Скачать или смотреть Exploring the obscuration properties of AGN in the Chandra Deep Wide Field Survey with BXA

Presenter: Alberto Masini (SISSA)

Date: Thursday 10th February 2022

Abstract:
Most active galactic nuclei (AGN) are obscured by some amount of gas along the line of sight. The shape of the photoelectric cutoff produced in the soft X-rays is very sensitive to the exact amount of column density, making X-ray spectroscopy a powerful tool to measure it.
With the aim of tracking how obscuration evolves with AGN luminosity and redshift, I will illustrate an ongoing project to systematically measure with BXA the column density of a large sample of ~6.5k X-ray selected AGN from the most recent Chandra deep survey in Boötes.
All spectra are fitted, independently from their number of photons, to mitigate selection effects: for this reason, BXA is the ideal tool to perform this kind of analysis. Preliminary results suggest that the fraction of obscured AGN strongly evolves with both redshift and luminosity, shedding new light on the complex interplay between the AGN and its surrounding environment.

For more information about XSF22, see https://peterboorman.com/xsf22