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Gravitational lens system by DarkSapiens Gravitational lens system by DarkSapiens
Artistic representation of the phenomenon I studied during my PhD thesis. A quasar (left) emits light that gets deflected by a galaxy acting as gravitational lens (center, orange), making us see four images of the quasar when we observe the system (right).

The image on the right is our actual data from mid-infrared observations, described in the following paper: adsabs.harvard.edu/abs/2016ApJ…

Cosmological simulations show that part of the dark matter in the halo of the lens galaxy should be concentrated in subhaloes (that I illustrated in gray), but in numbers far higher than the amount of satellites observed in nearby galaxies. This is important because they either do not exist and our dark matter theories require refinements, or they are there but do not contain stars that would make them luminous. The gravity of these subhaloes has an effect in the fluxes we observe in the multiple images of the lensed quasar, and we can use gravitational lensing to detect their presence.
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January 3
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