Predicted multiply imaged X-ray AGNs in the XXL survey
Journal article, 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

University of Liège

A. Elyiv

Main Astronomical Observatory Nasu

University of Liège

University of Bologna

O. Melnyk

Taras Shevchenko National University of Kyiv

University of Liège

O. Wertz

University of Liège

Cathy Horellou

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

J. Surdej

University of Liège

Monthly Notices of the Royal Astronomical Society

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

Vol. 452 2 1480-1492

Subject Categories

Astronomy, Astrophysics and Cosmology


Onsala Space Observatory



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