Deep 20 GHz observations of X-ray selected QSOs the Compact Array Broadband Backend (CABB)

TL;DR

This study utilizes the new CABB system on ATCA to observe X-ray selected QSOs at 20 GHz, aiming to analyze their high-frequency radio luminosity and recent AGN activity at redshifts below 1.

Contribution

First application of CABB for high-frequency observations of X-ray selected QSOs, providing insights into their core emission and recent activity.

Findings

Enhanced sensitivity enables detection of fainter radio sources.

Focus on core emission reveals recent AGN activity.

Sample size allows for statistical analysis of luminosity distribution.

Abstract

The recently commissioned Compact Array Broadband Backend (CABB) on the Australia Telescope Compact Array (ATCA) provides 2 GHz bandwidth in each frequency and polarisation, significantly increasing the sensitivity of the Array. This increased sensitivity allows for larger samples of sources to be targeted whilst also probing fainter radio luminosities. Using CABB, we have observed a large sample of objects at 20 GHz to investigate the high-frequency radio luminosity distribution of X-ray selected QSOs at redshifts less than 1. Observing at high frequencies allows us to focus on the core emission of the AGN, hence recording the most recent activity.