Discovery of the Lensed Quasar System DES J0408-5354

Lin, H and Buckley-Geer, E and Agnello, A and Desai, Shantanu and et al, . (2017) Discovery of the Lensed Quasar System DES J0408-5354. The Astrophysical Journal Letters, 838 (15). pp. 1-7.

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Abstract

We report the discovery and spectroscopic con fi rmation of the quad-like lensed quasar system DES J0408-5354 found in the Dark Energy Survey ( DES ) Year 1 ( Y1 ) data. This system was discovered during a search for DES Y1 strong lensing systems using a method that identi fi ed candidates as red galaxies with multiple blue neighbors. DES J0408-5354 consists of a central red galaxy surrounded by three bright ( i 20 < ) blue objects and a fourth red object. Subsequent spectroscopic observations using the Gemini South telescope con fi rmed that the three blue objects are indeed the lensed images of a quasar with redshift z  =  2.375, and that the central red object is an early- type lensing galaxy with redshift z  =  0.597. DES J0408-5354 is the fi rst quad lensed quasar system to be found in DES and begins to demonstrate the potential of DES to discover and dramatically increase the sample size of these very rare objects.

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