posted on 2024-08-06, 10:23authored byB. Nord, E. Buckley-Geer, H. Lin, H. T. Diehl, J. Helsby, N. Kuropatkin, A. Amara, T. Collett, S. Allam, G. B. Caminha, C. De Bom, S. Desai, H. Dumet-Montoya, M. Elidaiana S Da Pereira, D. A. Finley, B. Flaugher, C. Furlanetto, H. Gaitsch, M. Gill, K. W. Merritt, A. More, D. Tucker, A. Saro, E. S. Rykoff, E. Rozo, S. Birrer, F. B. Abdalla, A. Agnello, M. Auger, R. J. Brunner, M. Carrasco Kind, F. J. Castander, C. E. Cunha, L. N. Da Costa, R. J. Foley, D. W. Gerdes, Karl GlazebrookKarl Glazebrook, J. Gschwend, W. Hartley, R. Kessler, David Lagattuta, G. Lewis, M. A G Maia, M. Makler, F. Menanteau, A. Niernberg, D. Scolnic, J. D. Vieira, R. Gramillano, T. M C Abbott, M. Banerji, A. Benoit-Lévy, D. Brooks, D. L. Burke, D. Capozzi, A. Carnero Rosell, J. Carretero, C. B. D'Andrea, J. P. Dietrich, P. Doel, A. E. Evrard, J. Frieman, E. Gaztanaga, D. Gruen, K. Honscheid, D. J. James, K. Kuehn, T. S. Li, M. Lima, J. L. Marshall, P. Martini, P. Melchior, R. Miquel, E. Neilsen, R. C. Nichol, R. Ogando, A. A. Plazas, A. K. Romer, M. Sako, E. Sanchez, V. Scarpine, M. Schubnell, I. Sevilla-Noarbe, R. C. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, M. E C Swanson, G. Tarle, J. Thaler, A. R. Walker, W. Wester, Y. Zhang
We report the observation and confirmation of the first group- and cluster-scale strong gravitational lensing systems found in Dark Energy Survey data. Through visual inspection of data from the Science Verification season, we identified 53 candidate systems. We then obtained spectroscopic follow-up of 21 candidates using the Gemini Multi-object Spectrograph at the Gemini South telescope and the Inamori-Magellan Areal Camera and Spectrograph at the Magellan/Baade telescope. With this follow-up, we confirmed six candidates as gravitational lenses: three of the systems are newly discovered, and the remaining three were previously known. Of the 21 observed candidates, the remaining 15 either were not detected in spectroscopic observations, were observed and did not exhibit continuum emission (or spectral features), or were ruled out as lensing systems. The confirmed sample consists of one group-scale and five galaxy-cluster-scale lenses. The lensed sources range in redshift z ∼ 0.80-3.2 and in i-band surface brightness i SB ∼ 23-25 mag arcsec-2 (2" aperture). For each of the six systems, we estimate the Einstein radius θ E and the enclosed mass M enc, which have ranges θ E ∼ 5"-9" and M enc ∼ 8 x1012 to 6 x1013 M o, respectively.
Funding
Ministry of Economy, Industry and Competitiveness
Fermilab
United States Department of Energy
European Commission
Directorate for Mathematical & Physical Sciences
Coordenação de Aperfeicoamento de Pessoal de Nível Superior
Office of Science
Science and Technology Facilities Council
Research England
Financiadora de Estudos e Projetos
Deutsche Forschungsgemeinschaft
Australian Research Council
Alfred P. Sloan Foundation
National Aeronautics and Space Administration
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
Ministerio de Educación Cultura y Deporte
National Council for Scientific and Technological Development