Predicted multiply imaged X-ray AGNs in the XXL survey
Artikel i vetenskaplig tidskrift, 2015

We estimate the incidence of multiply imaged active galactic nuclei (AGNs) among the optical counterparts of X-ray selected point-like sources in the XXL field.We also derive the expected statistical properties of this sample, such as the redshift distribution of the lensed sources and of the deflectors that lead to the formation of multiple images, modelling the deflectors using both spherical and ellipsoidal singular isothermal mass distributions. We further assume that the XXL survey sample has the same overall properties as the smaller XMM-COSMOS sample restricted to the same flux limits and taking into account the detection probability of the XXL survey. Among the X-ray sources with a flux in the [0.5-2] keVband larger than 3.0×10-15 erg cm-2 s-1 and with optical counterparts brighter than an r-band magnitude of 25, we expect ~20 multiply imaged sources. Out of these, ~16 should be detected if the search is made among the seeing-limited images of the X-ray AGN optical counterparts and only one of them should be composed of more than two lensed images. Finally, we study the impact of the cosmological model on the expected fraction of lensed sources.

Gravitational lensing: strong

Cosmological parameters

Galaxies: active

X-rays: galaxies


F. Finet

Aryabhatta Research Institute of Observational Sciences

Universite de Liège

A. Elyiv

Main Astronomical Observatory Nasu

Universite de Liège

Universita di Bologna

O. Melnyk

Taras Shevchenko National University of Kyiv

Universite de Liège

O. Wertz

Universite de Liège

Cathy Horellou

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

J. Surdej

Universite de Liège

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 452 1480-1492


Astronomi, astrofysik och kosmologi


Onsala rymdobservatorium