Gravitationally lensed QSOs in the ISSIS/WSO-UV era

TL;DR

This paper discusses the importance of gravitationally lensed quasars at redshifts 1-2 for understanding active galactic nuclei and galaxy structure, emphasizing UV observations with ISSIS on WSO-UV.

Contribution

It proposes observation strategies for analyzing optically bright GLQs at z~1.5 using ISSIS on the WSO-UV to study their intrinsic and extrinsic variations.

Findings

Potential to detect intrinsic and extrinsic variations in GLQs.

Insights into the structure of active galactic nuclei.

Strategies for UV observation of GLQs with ISSIS.

Abstract

Gravitationally lensed QSOs (GLQs) at redshift z = 1-2 play a key role in understanding the cosmic evolution of the innermost parts of active galaxies (black holes, accretion disks, coronas and internal jets), as well as the structure of galaxies at intermediate redshifts. With respect to studies of normal QSOs, GLQ programmes have several advantages. For example, a monitoring of GLQs may lead to unambiguous detections of intrinsic and extrinsic variations. Both kinds of variations can be used to discuss central engines in distant QSOs, and mass distributions and compositions of lensing galaxies. In this context, UV data are of particular interest, since they correspond to emissions from the immediate surroundings of the supermassive black hole. We describe some observation strategies to analyse optically bright GLQs at z of about 1.5, using ISSIS (CfS) on board World Space Observatory-Ultraviolet.