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Predicted multiply imaged X-ray AGNs in the XXL survey

F. Finet ; A. Elyiv ; O. Melnyk ; O. Wertz ; Cathy Horellou (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; J. Surdej
Monthly notices of the Royal Astronomical Society (0035-8711). Vol. 452 (2015), 2, p. 1480-1492.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Cosmological parameters, Galaxies: active, Gravitational lensing: strong, X-rays: galaxies

Denna post skapades 2015-10-01. Senast ändrad 2016-01-26.
CPL Pubid: 223548


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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)


Astronomi, astrofysik och kosmologi

Chalmers infrastruktur

Onsala rymdobservatorium