The Gini Coefficient as a Morphological Measurement of Strongly Lensed Galaxies in the Image Plane

Florian, Michael K.; Li, Nan; Gladders, Michael D.

doi:10.3847/0004-637X/832/2/168

The Gini Coefficient as a Morphological Measurement of Strongly Lensed Galaxies in the Image Plane

Journal Article · Thu Dec 01 00:00:00 EST 2016 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/0004-637X/832/2/168· OSTI ID:1392008

^[1]; ^[2]; Gladders, Michael D. ^[1]

Univ. of Chicago, IL (United States). Dept. of Astronomy and Astrophysics and Kavli Inst. for Cosmological Physics
Univ. of Chicago, IL (United States). Dept. of Astronomy and Astrophysics and Kavli Inst. for Cosmological Physics; Argonne National Lab. (ANL), Lemont, IL (United States)

Characterization of the morphology of strongly lensed galaxies is challenging because images of such galaxies are typically highly distorted. Lens modeling and source plane reconstruction is one approach that can provide reasonably undistorted images from which morphological measurements can be made, though at the expense of a highly spatially variable telescope point-spread function (PSF) when mapped back to the source plane. Unfortunately, modeling the lensing mass is a time-and resource-intensive process, and in many cases there are too few constraints to precisely model the lensing mass. If, however, useful morphological measurements could be made in the image plane rather than the source plane, it would bypass this issue and obviate the need for a source reconstruction process for some applications. As such, we examine the use of the Gini coefficient as one such measurement. Because it depends on the cumulative distribution of the light of a galaxy, but not the relative spatial positions, the fact that surface brightness is conserved by lensing means that the Gini coefficient may be well preserved by strong gravitational lensing. Through simulations, we test the extent to which the Gini coefficient is conserved, including by effects due to PSF convolution and pixelization, to determine whether it is invariant enough under lensing to be used as a measurement of galaxy morphology that can be made in the image plane.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Kavli Institute for Cosmological Physics at the University of Chicago; National Science Foundation (NSF); USDOE Office of Science

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1392008

Alternate ID(s):: OSTI ID: 22660982

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 832; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Morphological Parameters of Galaxies at z ∼ 8 in the BoRG and CANDELS Survey Kusmic, Samir; Holwerda, Benne W.; Bridge, Joanna S. Research Notes of the AAS, Vol. 3, Issue 9 https://doi.org/10.3847/2515-5172/ab43c1	journal	September 2019

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