Who are we (contact us)


Old Q0957+561 data & software: 

Optical Monitoring

HST-STIS Spectra

Simple FORTRAN programs to apply the d2 test (accurate and robust time delay measurements)


Postgraduate Course on GL




Workshop 2004



   ► Photos






Gravitational Lenses (GL) at the University of Cantabria (UC)

Since 1998, the Gravitational LENses and DArk MAtter (GLENDAMA) project is planning, conducting and analyzing observations of gravitationally lensed quasars and related objects. Here below we present our 1999-2016 database, as well as our most recent results and tools





  Discovery of the double quasar SDSS J1617+3827

Spectroscopic follow-up observations of SS2 targets in Table 1 of  Sergeyev et al. (2016) have led to the discovery of the double quasar SDSS J1617+3827 (z = 2.079). This consists of an image A (RA = 16:17:52.92, Dec = 38:27:37.09; r ~ 19 mag) and an image B (r  ~ 21 mag) that are separated by ~ 2.1" (see below). Apart from the two quasar images, the source to the left of A is most likely related to the lensing galaxy G. On March 1, 2017, we have obtained GTC/OSIRIS/R500B spectra of A, B and G by using two different long-slit orientations: (1) aligned with the axis defined by A and B, and (2) aligned with the direction joining A and G (see preliminary spectra of ABG below). For each orientation, we have taken 3900 s exposures in dark time and sub-arcsecond seeing conditions (average FWHM). Despite the faintness of  G, we are able to extract its spectrum at red wavelengths, which tentatively shows the CaII HK doublet, the G band and some Balmer lines at z = 0.602 (Shalyapin et al. 2017, in preparation)


UC Simulator for ISSIS (WSO-UV)   


(ISSIS latest design)

Crowded-field Image Simulator (CIS)

Download the CIS and related files

About the tool and how it works for GL



Webmaster: goicol(at)unican.es

October 2017