64 citations · 486 across the 44 of their papers we have counts for
24 papers · 1 filter
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…
SDSS J1001+5027: Strong microlensing-induced chromatic variation caught in the act
Luis J. Goicoechea, Vyacheslav N. Shalyapin
We conducted long-term monitoring of the doubly imaged gravitationally lensed quasar SDSS J1001+5027 consisting of spectro-photometric observations separated by 120 days (tim…
Optical+NIR analysis of a Newly Confirmed Einstein ring at z1 from the Kilo-Degree Survey: Dark matter fraction, total and dark matter density slope and IMF
Rui Li, Nicola R. Napolitano, Giuseppe D Ago +16
We report the spectroscopic confirmation of a bright blue Einstein ring in the Kilo Degree Survey (KiDS) footprint: the Einstein ``blue eye''. Spectroscopic data from X-Shooter at…
FBQ 0951+2635: time delay and structure of the main lensing galaxy
Vyacheslav N. Shalyapin, Luis J. Goicoechea, Eleana Ruiz-Hinojosa
As there is a long-standing controversy over the time delay between the two images of the gravitationally lensed quasar FBQ 0951+2635, we combined early and new optical light curve…
Andromeda's Parachute: Time Delays and Hubble Constant
Vyacheslav N. Shalyapin, Luis J. Goicoechea, Karianne Dyrland +1
The gravitational lens system PS J0147+4630 (Andromeda's Parachute) consists of four quasar images ABCD and a lensing galaxy. We obtained -band light curves of ABCD in the 2017$…