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Observation and confirmation of six strong-lensing systems in the Dark Energy Survey Science Verification data

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posted on 2023-06-09, 03:13 authored by Kathy RomerKathy Romer, B Nord, E Buckley-Geer, H Lin, H T Diehl, J Helsby, N Kuropatkin, A Amara, T Collett, The DES Collaboration, others
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 theta E and the enclosed mass M enc, which have ranges theta E ˜ 5"--9" and M enc ˜ 8 × 1012 to 6 × 1013 M &sun;, respectively. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.

Funding

STFC

History

Publication status

  • Published

File Version

  • Published version

Journal

Astrophysical Journal

ISSN

0004-637X

Publisher

American Astronomical Society

Issue

1

Volume

827

Page range

51

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Astronomy Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-09-30

First Open Access (FOA) Date

2016-09-30

First Compliant Deposit (FCD) Date

2016-09-30

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