Mar 15 – 20, 2020
Europe/Berlin timezone

Gravitationally lensed QSOs in the eFEDS survey

Not scheduled




Gravitationally lensed QSOs are rare objects, only a few hundred objects have been discovered so far. There is growing interest in lensed QSOs due to recent precision measurement of H_0 using the time delay distance.
We have started a project to identify multiple QSO images using the eFEDS X-ray catalogue as a preselected sample of AGN. X-ray selection provides a well defined input sample independent of optical colours which may be affected by blending of the lensing and lensed objects.
The lensed QSOs are identified by using astrometric information from GAIA and
photometry from the WISE, SDSS, Subaru HSC, and DECaLS surveys.

We will present the first candidates identified by our survey.

Presenter status eROSITA consortium member

Primary author

Dr Georg Lamer (Leibniz Institut für Astrophysik)


Prof. Masamune Oguri (University of Tokyo) Dr Anupreeta More (IUCAA, Pune, India) Dr Cristian Eduard Rusu (NAOJ) Dr Axel Schwope (Leibniz Institut für Astrophysik) Dr Teng Liu (MPE) Dr Mirko Krumpe (Leibniz Instutut für Astrophysik)

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