Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe.191v&link_type=abstract
"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199
Astronomy and Astrophysics
Astronomy
Scientific paper
We continued the observations of the gravitationally lensed object SBS 1520+530 discovered with the 6 m telescope in 1996. Direct images of this object taken with a CCD camera at the 6 m telescope in the B , V, R, I bands with a seeing (FWHM) from 0.8-1.4 arcsec, allowed new data on both the structure of the system itself and on the environment of this unique object to be obtained. The R images with a limiting magnitude of about 25.5 after making careful account for the flux from the bright components, of the system permitted a new component located to 1.7 arcsec north from component B and having a brightness of about 22.3. The similarity of its colour indices to those of the main components give grounds to consider it one more lensed image. Besides this object, several galaxies with apparent R magnitudes from 21.5 to 25.0 were found in close proximity to the system. Probably it is these galaxies that cause the narrow absorption lines at z=0.715 and z=0.814 to occur in the spectrum of lensed quasar image. The data obtained with a seeing of 1.1-1.4 arcsec made it possible to plot a distribution of over 300 faint galaxies brighter than 25.0 in R band and to detect the regions of enhanced surface density of these objects in an area of 5x5 arcmin in size. It is possible that these regions are related to real clusters of galaxies on the line of sight and are also responsible for the observed lensing effect.
Chavushyan Vahram H.
Vlasyuk V. V.
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