Polarization of AGN in UV Spectral Range

TL;DR

This paper reviews recent issues in cosmology and stellar physics related to UV observations, including quasar polarization, black hole accretion, and the potential detection of axions, emphasizing the importance of UV data in understanding these phenomena.

Contribution

It highlights the significance of UV spectral observations for probing cosmic reionization, QSO polarization mechanisms, and the origins of super Eddington X-ray sources, proposing new research directions.

Findings

UV observations can reveal the reionization epoch of the Universe.

Alignment of QSO polarization vectors may indicate axion-photon conversion.

UV data can help identify the nature of super Eddington X-ray sources.

Abstract

We present the review of some new problems in cosmology and physics of stars in connection with future launching of WSO. We discuss three problems. UV observations of distant z > 6 quasars allow to obtain information on the soft < 1 KeV X-ray radiation of the accretion disk around a supermassive black hole because of its cosmological redshift. Really the region of X-ray radiation is insufficiently investigated because of high galactic absorption. In a result one will get important information on the reionization zone of the Universe. Astronomers from ESO revealed the effect of alignment of electric vectors of polarized QSOs. One of the probable mechanism of such alignment is the conversion of QSO radiation into low mass pseudoscalar particles (axions) in the extragalactic magnetic field. These boson like particles have been predicted by new SUSY particle physics theory. Since the probability of such conversion is increasing namely in UV spectral range one can expect the strong correlation between UV spectral energy distribution of QSO radiation and polarimetric data in the optical range. In the stellar physics one of the interesting problems is the origin of the X-ray sources with super Eddington luminosities. The results of UV observations of these X-ray sources will allow to find the origin of these sources as accreting intermediate mass black holes.