Broad absorption line (BAL) quasars as a class of low luminosity AGNs

TL;DR

This paper investigates broad absorption line quasars, focusing on their radio properties, structures, and evolution, to better understand their role in galaxy evolution and feedback processes.

Contribution

It provides new high-resolution radio observations of BAL quasars, enhancing understanding of their radio structures, orientation, and age, which were previously limited.

Findings

Radio structures of BAL quasars are diverse.

BAL quasars can be both young and evolved objects.

Radio emission in BAL quasars is often weak and compact.

Abstract

Broad absorption lines seen in some quasars prove the existence of ionized plasma outflows from the accretion disk. Outflows together with powerful jets are important feedback processes. Understanding physics behind BAL outflows might be a key to comprehend Galaxy Evolution as a whole. First radio-loud BAL quasar was discovered in 1997 and this discovery has opened new possibilities for studies of the BAL phenomena, this time on the basis of radio emission. However, information about the radio structures, orientation and age of BAL quasars is still very limited due to weak radio emission and small sizes of these objects. Our high-resolution radio survey of a sample of BAL quasars aims to increase our knowledge about these objects. In this article, we present some conclusions arising from our research.