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Title: Discovery of two gravitationally lensed quasars in the Dark Energy Survey

Abstract

In this study, we present spectroscopic confirmation of two new lensed quasars via data obtained at the 6.5m Magellan/Baade Telescope. The lens candidates have been selected from the Dark Energy Survey (DES) and WISE based on their multi-band photometry and extended morphology in DES images. Images of DES J0115-5244 show two blue point sources at either side of a red galaxy. Our long-slit data confirm that both point sources are images of the same quasar at zs = 1.64. The Einstein Radius estimated from the DES images is 0.51''. DES J2146-0047 is in the area of overlap between DES and the Sloan Digital Sky Survey (SDSS). Two blue components are visible in the DES and SDSS images. The SDSS fiber spectrum shows a quasar component at zs = 2.38 and absorption compatible with Mg II and Fe II at zl = 0.799, which we tentatively associate with the foreground lens galaxy. The long-slit Magellan spectra show that the blue components are resolved images of the same quasar. Furthermore, the Einstein Radius is 0.68'' corresponding to an enclosed mass of 1.6 × 1011 M. Three other candidates were observed and rejected, two being low-redshift pairs of starburst galaxies, and one beingmore » a quasar behind a blue star. These first confirmation results provide an important empirical validation of the data-mining and model-based selection that is being applied to the entire DES dataset.« less

Authors:
 [1]
  1. PAB, Los Angeles, CA (United States). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
DES Collaboration
OSTI Identifier:
1221334
Alternate Identifier(s):
OSTI ID: 1263419
Report Number(s):
FERMILAB-PUB-15-341-AE; SLAC-PUB-16619
Journal ID: ISSN 1365-2966; arXiv eprint number arXiv:1508.01203
Grant/Contract Number:  
AC02-07CH11359; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society (Online)
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society (Online); Journal Volume: 454; Journal Issue: 2; Journal ID: ISSN 1365-2966
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; gravitational lensing: strong; quasars: emission lines; methods: observational; methods: statistical; 79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Agnello, A. Discovery of two gravitationally lensed quasars in the Dark Energy Survey. United States: N. p., 2015. Web. doi:10.1093/mnras/stv2171.
Agnello, A. Discovery of two gravitationally lensed quasars in the Dark Energy Survey. United States. https://doi.org/10.1093/mnras/stv2171
Agnello, A. Thu . "Discovery of two gravitationally lensed quasars in the Dark Energy Survey". United States. https://doi.org/10.1093/mnras/stv2171. https://www.osti.gov/servlets/purl/1221334.
@article{osti_1221334,
title = {Discovery of two gravitationally lensed quasars in the Dark Energy Survey},
author = {Agnello, A.},
abstractNote = {In this study, we present spectroscopic confirmation of two new lensed quasars via data obtained at the 6.5m Magellan/Baade Telescope. The lens candidates have been selected from the Dark Energy Survey (DES) and WISE based on their multi-band photometry and extended morphology in DES images. Images of DES J0115-5244 show two blue point sources at either side of a red galaxy. Our long-slit data confirm that both point sources are images of the same quasar at zs = 1.64. The Einstein Radius estimated from the DES images is 0.51''. DES J2146-0047 is in the area of overlap between DES and the Sloan Digital Sky Survey (SDSS). Two blue components are visible in the DES and SDSS images. The SDSS fiber spectrum shows a quasar component at zs = 2.38 and absorption compatible with Mg II and Fe II at zl = 0.799, which we tentatively associate with the foreground lens galaxy. The long-slit Magellan spectra show that the blue components are resolved images of the same quasar. Furthermore, the Einstein Radius is 0.68'' corresponding to an enclosed mass of 1.6 × 1011 M⊙. Three other candidates were observed and rejected, two being low-redshift pairs of starburst galaxies, and one being a quasar behind a blue star. These first confirmation results provide an important empirical validation of the data-mining and model-based selection that is being applied to the entire DES dataset.},
doi = {10.1093/mnras/stv2171},
journal = {Monthly Notices of the Royal Astronomical Society (Online)},
number = 2,
volume = 454,
place = {United States},
year = {Thu Oct 01 00:00:00 EDT 2015},
month = {Thu Oct 01 00:00:00 EDT 2015}
}

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