354 citations · 732 across the 8 of their papers we have counts for
4 papers · 1 filter
Hubble constant and dark energy inferred from free-form determined time delay distances
Mauro Sereno, Danuta Paraficz
Time delays between multiple images of lensed sources can probe the geometry of the universe. We propose a novel method based on free-form modelling of gravitational lenses to esti…
The Hubble constant inferred from 18 time-delay lenses
Danuta Paraficz, Jens Hjorth
We present a simultaneous analysis of 18 galaxy lenses with time delay measurements. For each lens we derive mass maps using pixelated simultaneous modeling with shared Hubble cons…
Gravitational lenses as cosmic rulers: density of dark matter and dark energy from time delays and velocity dispersions
Danuta Paraficz, Jens Hjorth
We show that a cosmic standard ruler can be constructed from the joint measurement of the time delay (dt) between gravitationally lensed quasar images and the velocity dispersion (…
Results of optical monitoring of 5 SDSS double QSOs with the Nordic Optical Telescope
Danuta Paraficz, Jens Hjorth, Árdís Elíasdóttir
We present optical R-band light curves of five SDSS double QSOs (SDSS J0903+5028, SDSS J1001+5027, SDSS J1206+4332, SDSS J1353+1138, SDSS J1335+0118) obtained from monitoring at th…