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3 papers
Joining forces: 30 years of optical monitoring of the Einstein Cross
V. N. Shalyapin, L. J. Goicoechea, R. Gil-Merino +5
We present an extended optical monitoring of the quadruply-imaged gravitationally lensed quasar QSO 2237+0305, the Einstein Cross, including observations from different observatori…
Primordial black holes in the main lensing galaxy of FBQ 0951+2635
Daniel Isla, Luis J. Goicoechea, Ana Esteban-Gutiérrez +4
Although dark matter in galaxies may consist of elementary particles different from those that make up ordinary matter and that would be smoothly distributed (still undetected), th…
Constraints on the Abundance of PBHs from X-ray Quasar Microlensing Observations: Substellar to Planetary Mass Range
A. Esteban-Gutiérrez, E. Mediavilla, J. Jiménez-Vicente +1
We use X-ray observations of quasar microlensing (sensitive to smaller compact objects than in the optical) to study the possible presence of a population of low mass black holes (…