The lensing system towards the doubly imaged quasar SBS 1520+530
نویسندگان
چکیده
منابع مشابه
The lensing system towards the doubly imaged quasar SBS 1520 + 530 ⋆
The gravitational potential responsible for the lensing effect in SBS 1520+530 is studied over length scales from a few arc-seconds to a few arc-minutes. For this purpose, we use sharply deconvolved Hubble Space Telescope images in the optical and near-IR, in combination with ground based optical data obtained over a wider field-of-view. In particular, we have carried out a multi-color analysis...
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H band observations with a spatial resolution of 0. 15 carried out with the Canada-France-Hawaii Telescope adaptive optics system show a galaxy between the components of the double BAL QSO SBS 1520+530, thereby confirming this system as a gravitational lens. The galaxy is located 0. 40 from the fainter of the two QSO images and is offset 0. 12 from the line joining them. The H magnitude of the ...
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Aims. We present VRi photometric observations of the quadruply imaged quasar HE0435-1223, carried out with the Danish 1.54 m telescope at the La Silla Observatory. Our aim was to monitor and study the magnitudes and colors of each lensed component as a function of time. Methods. We monitored the object during two seasons (2008 and 2009) in the VRi spectral bands, and reduced the data with two i...
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We use the first data release of the 2-degree Field Quasar survey to investigate the effect of gravitational magnification by foreground absorbing systems on background quasars. We select two populations of quasars from this sample: one with strong Mg II/Fe II absorbers and one without. The selection is done in such a way that the two populations have the same redshift distribution and the abso...
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We report the discovery of a new gravitational lens candidate Q2138-431AB, comprising two quasar images at a redshift of 1.641 separated by 4.5 arcsecs. The spectra of the two images are very similar, and the redshifts agree to better than 115 km.sec. The two images have magnitudes BJ = 19.8 and BJ = 21.0, and in spite of a deep search and image subtraction procedure, no lensing galaxy has been...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2002
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20020056