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Discovery of the optically bright, wide separation double quasar SDSS J1442+4055

Abstract: Optically bright, wide separation double (gravitationally lensed) quasars can be easily monitored, leading to light curves of great importance in determining the Hubble constant and other cosmological parameters, as well as the structure of active nuclei and haloes of galaxies. Searching for new double quasars in the Sloan Digital Sky Survey III (SDSS-III) data base, we discovered SDSS J1442+4055. This consists of two bright images (r ? 18?19) of the same distant quasar at z = 2.575. The two quasar images are separated by ?2 ??. .?? 1, show significant parallel flux variations and can be monitored from late 2015. We also found other two double quasar candidates, SDSS J1617+3827 (z = 2.079) and SDSS J1642+3200 (z = 2.264), displaying evidence for the presence of a lensing object and parallel flux variations, but requiring further spectroscopic observations to be confirmed as lensed quasars.

 Fuente: Monthly Notices of the Royal Astronomical Society, Vol. 456, Iss. 2, Pp. 1948?1954, (2016)

 Editorial: Oxford University Press

 Fecha de publicación: 01/02/2016

 Nº de páginas: 7

 Tipo de publicación: Artículo de Revista

 DOI: 10.1093/mnras/stv2763

 ISSN: 0035-8711,1365-2966

 Proyecto español: AYA2013-47744-C3-2-P

 Url de la publicación: https://doi.org/10.1093/mnras/stv2763