skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

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 z s = 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 z s = 2.38 and absorption compatible with Mg II and Fe II at z l = 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 × 10 11 M . Three other candidates were observed and rejected, two being low-redshift pairs ofmore » 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.« less

Authors:
 [1]
  1. PAB, Los Angeles, CA (United States). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
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. doi:10.1093/mnras/stv2171.
Agnello, A. Thu . "Discovery of two gravitationally lensed quasars in the Dark Energy Survey". United States. doi: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 = {2015},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Data mining for gravitationally lensed quasars
journal, February 2015

  • Agnello, Adriano; Kelly, Brandon C.; Treu, Tommaso
  • Monthly Notices of the Royal Astronomical Society, Vol. 448, Issue 2
  • DOI: 10.1093/mnras/stv037

The multiple quasar Q2237+0305 under a microlensing caustic
journal, January 2008


Microlensing of the broad-line region in the quadruply imaged quasar HE0435-1223
journal, May 2014


Chitah: STRONG-GRAVITATIONAL-LENS HUNTER IN IMAGING SURVEYS
journal, July 2015


Direct Detection of Cold Dark Matter Substructure
journal, June 2002

  • Dalal, N.; Kochanek, C. S.
  • The Astrophysical Journal, Vol. 572, Issue 1
  • DOI: 10.1086/340303

IMACS: The Inamori-Magellan Areal Camera and Spectrograph on Magellan-Baade
journal, March 2011

  • Dressler, Alan; Bigelow, Bruce; Hare, Tyson
  • Publications of the Astronomical Society of the Pacific, Vol. 123, Issue 901
  • DOI: 10.1086/658908

Microlensing of Quasar Broad Emission Lines: Constraints on Broad line Region size
journal, February 2013


The Sloan Digital sky Survey Quasar lens Search. ii. Statistical lens Sample from the Third data Release
journal, January 2008


Dark Matter mass Fraction in lens Galaxies: new Estimates from Microlensing
journal, January 2015


Evidence for substructure in lens galaxies?
journal, April 1998


The Detection of Pure Dark Matter Objects with Bent Multiply Imaged Radio Jets
journal, December 2002

  • Metcalf, R. Benton
  • The Astrophysical Journal, Vol. 580, Issue 2
  • DOI: 10.1086/343766

Compound Gravitational Lensing as a Probe of Dark Matter Substructure within Galaxy Halos
journal, December 2001

  • Metcalf, R. Benton; Madau, Piero
  • The Astrophysical Journal, Vol. 563, Issue 1
  • DOI: 10.1086/323695

Measuring Microlensing Using Spectra of Multiply Lensed Quasars
journal, July 2012


Detection of substructure with adaptive optics integral field spectroscopy of the gravitational lens B1422+231
journal, June 2014

  • Nierenberg, A. M.; Treu, T.; Wright, S. A.
  • Monthly Notices of the Royal Astronomical Society, Vol. 442, Issue 3
  • DOI: 10.1093/mnras/stu862

The Sloan Digital Sky Survey Quasar Lens Search. I. Candidate Selection Algorithm
journal, July 2006

  • Oguri, Masamune; Inada, Naohisa; Pindor, Bartosz
  • The Astronomical Journal, Vol. 132, Issue 3
  • DOI: 10.1086/506019

The stellar and dark matter distributions in elliptical galaxies from the ensemble of strong gravitational lenses
journal, February 2014

  • Oguri, Masamune; Rusu, Cristian E.; Falco, Emilio E.
  • Monthly Notices of the Royal Astronomical Society, Vol. 439, Issue 3
  • DOI: 10.1093/mnras/stu106

Probing the Coevolution of Supermassive Black Holes and Galaxies Using Gravitationally Lensed Quasar Hosts
journal, October 2006

  • Peng, Chien Y.; Impey, Chris D.; Rix, Hans‐Walter
  • The Astrophysical Journal, Vol. 649, Issue 2
  • DOI: 10.1086/506266

The Spatial Structure of an Accretion Disk
journal, January 2008

  • Poindexter, Shawn; Morgan, Nicholas; Kochanek, Christopher S.
  • The Astrophysical Journal, Vol. 673, Issue 1
  • DOI: 10.1086/524190

On the Possibility of Determining Hubble's Parameter and the Masses of Galaxies from the Gravitational Lens Effect
journal, September 1964


Quasar Microlensing at High Magnification and the Role of Dark Matter: Enhanced Fluctuations and Suppressed Saddle Points
journal, December 2002

  • Schechter, Paul L.; Wambsganss, Joachim
  • The Astrophysical Journal, Vol. 580, Issue 2
  • DOI: 10.1086/343856

The Quadruple Gravitational Lens PG 1115+080: Time Delays and Models
journal, February 1997

  • Schechter, Paul L.; Bailyn, Charles D.; Barr, Robert
  • The Astrophysical Journal, Vol. 475, Issue 2
  • DOI: 10.1086/310478

A CALIBRATION OF THE STELLAR MASS FUNDAMENTAL PLANE AT z ∼ 0.5 USING THE MICRO-LENSING-INDUCED FLUX RATIO ANOMALIES OF MACRO-LENSED QUASARS , ,
journal, September 2014

  • Schechter, Paul L.; Pooley, David; Blackburne, Jeffrey A.
  • The Astrophysical Journal, Vol. 793, Issue 2
  • DOI: 10.1088/0004-637X/793/2/96

Cosmology from Gravitational lens time Delays and Planck data
journal, June 2014


Strong Lensing by Galaxies
journal, August 2010


    Works referencing / citing this record: