Observation and confirmation of nine strong lensing systems in Dark Energy Survey Year 1 data

B. Nord, E. Buckley-Geer, H. Lin, N. Kuropatkin, T. Collett, D. L. Tucker, H. T. Diehl, A. Agnello, A. Amara, T. M. C. Abbott, S. Allam, J. Annis, S. Avila, K. Bechtol, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, C. E. CunhaL. N. da Costa, C. Davis, J. De Vicente, P. Doel, T. F. Eifler, A. E. Evrard, E. Fernandez, B. Flaugher, P. Fosalba, J. Frieman, J. Garcıa- Bellido, E. Gaztanaga, D. Gruen, R. A. Gruendl, G. Gutierrez, W. G. Hartley, D. L. Hollowood, K. Honscheid, B. Hoyle, D. J. James, K. Kuehn, N. Kuropatkin, O. Lahav, M. Lima, M. A. G. Maia, M. March, J. L. Marshall, P. Melchior, F. Menanteau, R. Miquel, A. A. Plazas, A. K. Romer, A. Roodman, E. S. Rykoff, E. Sanchez, V. Scarpine, R. Schindler, M. Schubnell, I. Sevilla-Noarbe, M. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, Y. Zhang

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We describe the observation and confirmation of nine new strong gravitational lenses discovered in Year 1 data from the Dark Energy Survey (DES). We created candidate lists based on a) galaxy group and cluster samples and b) photometrically selected galaxy samples. We selected 46 candidates through visual inspection and then used the Gemini Multi-Object Spectrograph (GMOS) at the Gemini South telescope to acquire spectroscopic follow-up of 21 of these candidates. Through analysis of this spectroscopic follow-up data, we confirmed nine new lensing systems and rejected two candidates, but the analysis was inconclusive on 10 candidates. For each of the confirmed systems, we report measured spectroscopic properties, estimated source image-lens separation, and estimated enclosed masses. The sources that we targeted have an i-band surface brightness range of iSB ∼ 22−24 mag/arcsec2 and a spectroscopic redshift range of zspec ∼ 0.8 − 2.6. The lens galaxies have a photometric redshift range of zlens ∼ 0.3 − 0.7. The lensing systems range in source image-lens separation 2 − 9" and in enclosed mass 1012 − 1013M⊙.
Original languageEnglish
Pages (from-to)1308–1322
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date28 Jan 2020
Publication statusPublished - 1 May 2020


  • astro-ph.CO
  • astro-ph.GA
  • astro-ph.IM
  • RCUK
  • STFC
  • gravitational lenses: general
  • gravitational lensing individual
  • gravitational lensing: strong
  • gravitational lensing: clusters
  • gravitational lensing: survey
  • surveys: DES


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