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The Gini Coefficient as a Tool for Image Family Identification in Strong Lensing Systems with Multiple Images

Journal Article · · The Astrophysical Journal. Letters (Online)
 [1];  [1];  [2];  [3]
  1. Univ. of Chicago, IL (United States)
  2. Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Univ. of Michigan, Ann Arbor, MI (United States)
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The sample of cosmological strong lensing systems has been steadily growing in recent years and with the advent of the next generation of space-based survey telescopes, the sample will reach into the thousands. The accuracy of strong lens models relies on robust identification of multiple image families of lensed galaxies. For the most massive lenses, often more than one background galaxy is magnified and multiply imaged, and even in the cases of only a single lensed source, identification of counter images is not always robust. Recently, we have shown that the Gini coefficient in space-telescope-quality imaging is a measurement of galaxy morphology that is relatively well-preserved by strong gravitational lensing. Here, we investigate its usefulness as a diagnostic for the purposes of image family identification and show that it can remove some of the degeneracies encountered when using color as the sole diagnostic, and can do so without the need for additional observations since whenever a color is available, two Gini coefficients are as well.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science; Univ. of Chicago, Kavli Institute for Cosmological Physics
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1248958
Alternate ID(s):
OSTI ID: 22518637
Journal Information:
The Astrophysical Journal. Letters (Online), Journal Name: The Astrophysical Journal. Letters (Online) Journal Issue: 2 Vol. 816; ISSN 2041-8213
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Inferring gas-phase metallicity gradients of galaxies at the seeing limit: a forward modelling approach journal March 2017
Pics: Simulations of Strong Gravitational Lensing in Galaxy Clusters journal August 2016
The Importance of Secondary Halos for Strong Lensing in Massive Galaxy Clusters across Redshift journal June 2019
Morphological Parameters of Galaxies at z ∼ 8 in the BoRG and CANDELS Survey journal September 2019
PICS: Simulations of Strong Gravitational Lensing in Galaxy Clusters text January 2015
Inferring gas-phase metallicity gradients of galaxies at the seeing limit: A forward modelling approach text January 2017
The importance of secondary halos for strong lensing in massive galaxy clusters across redshift text January 2018

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
galaxies: high-redshift
gravitational lensing: strong
methods: observational