# The obscured X-ray source population in the HELLAS2XMM survey: the Spitzer view

## TL;DR

This study investigates obscured Type 2 quasars from the HELLAS2XMM survey using Spitzer infrared data to estimate key black hole parameters, addressing gaps in understanding their accretion properties.

## Contribution

It provides new estimates of bolometric corrections, black hole masses, and Eddington ratios for a sample of high-redshift obscured quasars using multi-wavelength data.

## Key findings

- Black hole masses estimated for the sample.
- Eddington ratios derived indicating accretion rates.
- Bolometric corrections calculated for obscured AGN.

## Abstract

Recent X-ray surveys have provided a large number of high-luminosity, obscured Active Galactic Nuclei (AGN), the so-called Type 2 quasars. Despite the large amount of multi-wavelength supporting data, the main parameters related to the black holes harbored in such AGN are still poorly known. Here we present the results obtained for a sample of eight Type 2 quasars in the redshift range 0.9-2.1 selected from the HELLAS2XMM survey, for which we used Ks-band, Spitzer IRAC and MIPS data at 24 micron to estimate bolometric corrections, black hole masses, and Eddington ratios.