Serendipitous discovery of quadruply imaged quasars: Two diamonds
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2018-05
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en
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Oxford University Press
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Licencia CC
Resumen
Gravitationally lensed quasars are powerful and versatile astrophysical tools, but they are challengingly rare. In particular, only ~25 well-characterized quadruple systems are known to date. To refine the target catalogue for the forthcoming Taipan Galaxy Survey, the images of a large number of sources are being visually inspected in order to identify objects that are confused by a foreground star or galaxies that have a distinct multicomponent structure. An unexpected by-product of this work has been the serendipitous discovery of about a dozen galaxies that appear to be lensing quasars, i.e. pairs or quartets of foreground stellar objects in close proximity to the target source. Here, we report two diamond-shaped systems. Follow-up spectroscopy with the IMACS instrument on the 6.5mMagellan Baade telescope confirms one of these as a z=1.975 quasar quadruply lensed by a double galaxy at z=0.293. Photometry from publicly available survey images supports the conclusion that the other system is a highly sheared quadruply imaged quasar. In starting with objects thought to be galaxies, our lens finding technique complements the conventional approach of first identifying sources with quasar-like colours and subsequently finding evidence of lensing. © 2017 The Authors.
Notas
Indexación: Scopus.
JRL and RJS are supported by the STFC Durham Astronomy Consolidated Grant (ST/L00075X/1 and ST/P000541/1). TA acknowledges support by the Ministry for the Economy, Development, and Tourism's Programa Inicativa Científica Milenio through grant IC 12009, awarded to The Millennium Institute of Astrophysics (MAS). This paper includes data gathered with the 6.5m Magellan Telescopes located at Las Campanas Observatory, Chile. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. The Pan-STARRS1 Surveys (PS1) and the PS1 public science archive have been made possible through contributions by the Institute for Astronomy, the University of Hawaii, the Pan-STARRS Project Office, the Max-Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg and theMax Planck Institute for Extraterrestrial Physics, Garching, The Johns Hopkins University, DurhamUniversity, the University of Edinburgh, the Queen's University Belfast, the Harvard-Smithsonian Center forAstrophysics, the Las Cumbres ObservatoryGlobal Telescope Network Incorporated, the National Central University of Taiwan, the Space Telescope Science Institute, the National Aeronautics and Space Administration under grant no. NNX08AR22G issued through the Planetary Science Division of the NASA Science Mission Directorate, the National Science Foundation grant no. AST-1238877, the University of Maryland, Eotvos Lorand University (ELTE), the Los Alamos National Laboratory, and the Gordon and Betty Moore Foundation.
JRL and RJS are supported by the STFC Durham Astronomy Consolidated Grant (ST/L00075X/1 and ST/P000541/1). TA acknowledges support by the Ministry for the Economy, Development, and Tourism's Programa Inicativa Científica Milenio through grant IC 12009, awarded to The Millennium Institute of Astrophysics (MAS). This paper includes data gathered with the 6.5m Magellan Telescopes located at Las Campanas Observatory, Chile. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. The Pan-STARRS1 Surveys (PS1) and the PS1 public science archive have been made possible through contributions by the Institute for Astronomy, the University of Hawaii, the Pan-STARRS Project Office, the Max-Planck Society and its participating institutes, the Max Planck Institute for Astronomy, Heidelberg and theMax Planck Institute for Extraterrestrial Physics, Garching, The Johns Hopkins University, DurhamUniversity, the University of Edinburgh, the Queen's University Belfast, the Harvard-Smithsonian Center forAstrophysics, the Las Cumbres ObservatoryGlobal Telescope Network Incorporated, the National Central University of Taiwan, the Space Telescope Science Institute, the National Aeronautics and Space Administration under grant no. NNX08AR22G issued through the Planetary Science Division of the NASA Science Mission Directorate, the National Science Foundation grant no. AST-1238877, the University of Maryland, Eotvos Lorand University (ELTE), the Los Alamos National Laboratory, and the Gordon and Betty Moore Foundation.
Palabras clave
2M1310- 1714, Gravitational lensing: strong, Quasars: individual: 2M1134-2103
Citación
Monthly Notices of the Royal Astronomical Society, 476(1), pp. 927-932.