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8 papers · 2 filters
Deep Imaging of AXJ2019+112: The Luminosity of a ``Dark Cluster''
Narciso Benitez, Tom Broadhurst, Piero Rosati +4
We detect a distant cluster of galaxies centered on the QSO lens and luminous X-ray source AXJ2019+112, a.k.a. ``The Dark Cluster'' (Hattori et al 1997). Using deep V,I Keck images…
Redshift estimate of a gravitational lens from the observed reddening of a multiply imaged quasar
C. Jean, J. Surdej
Light rays from a multiply imaged quasar usually sample different path lengths across the deflector. Extinction in the lensing galaxy may thus lead to a differential obscuration an…
Three photometric methods tested on ground-based data of Q 2237+0305
I. Burud, R. Stabell, P. Magain +5
The Einstein Cross, Q~2237+0305, has been photometrically observed in four bands on two successive nights at NOT (La Palma, Spain) in October 1995. Three independent algorithms hav…
HST Observations of the QSO pair Q1026-0045A,B
Patrick Petitjean, Jean Surdej, Alain Smette +3
The spatial distribution of the Ly forest is studied using new HST data for the quasar pair Q~1026--0045 A and B at = 1.438 and 1.520 respectively. The angular separati…
Image Deconvolution of the Radio Ring PKS 1830-211
F. Courbin, C. Lidman, B. Frye +4
New high quality Keck and ESO images of PKS 1830-211 are presented. Applying a powerful new deconvolution algorithm to these optical and infrared data, both images of the flat spec…
High resolution optical and near-IR imaging of the quadruple quasar RX J0911.4+0551
I. Burud, F. Courbin, C. Lidman +10
We report the detection of four images in the recently discovered lensed QSO RX J0911.4+0551. With a maximum angular separation of 3.1", it is the quadruply imaged QSO with the wid…