2016ApJ...832...82J


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.02CEST10:07:30

2016ApJ...832...82J - Astrophys. J., 832, 82-82 (2016/November-3)

The systematics of strong lens modeling quantified: the effects of constraint selection and redshift information on magnification, mass, and multiple image predictability.

JOHNSON T.L. and SHARON K.

Abstract (from CDS):

Until now, systematic errors in strong gravitational lens modeling have been acknowledged but have never been fully quantified. Here, we launch an investigation into the systematics induced by constraint selection. We model the simulated cluster Ares 362 times using random selections of image systems with and without spectroscopic redshifts and quantify the systematics using several diagnostics: image predictability, accuracy of model-predicted redshifts, enclosed mass, and magnification. We find that for models with >15 image systems, the image plane rms does not decrease significantly when more systems are added; however, the rms values quoted in the literature may be misleading as to the ability of a model to predict new multiple images. The mass is well constrained near the Einstein radius in all cases, and systematic error drops to <2% for models using >10 image systems. Magnification errors are smallest along the straight portions of the critical curve, and the value of the magnification is systematically lower near curved portions. For >15 systems, the systematic error on magnification is ∼2%. We report no trend in magnification error with the fraction of spectroscopic image systems when selecting constraints at random; however, when using the same selection of constraints, increasing this fraction up to ∼0.5 will increase model accuracy. The results suggest that the selection of constraints, rather than quantity alone, determines the accuracy of the magnification. We note that spectroscopic follow-up of at least a few image systems is crucial because models without any spectroscopic redshifts are inaccurate across all of our diagnostics.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: clusters: general - gravitational lensing: strong - methods: statistical - methods: statistical

Status at CDS:  

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 565 0
2 ACT-CL J0102-4915 ClG 01 02 52.50 -49 14 58.0           ~ 150 0
3 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 636 0
4 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1271 0
5 MCS J0416.1-2403 ClG 04 16 08.380 -24 04 20.80           ~ 210 0
6 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 795 1
7 MCS J1149.5+2223 ClG 11 49 35.8 +22 23 55           ~ 316 0
8 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1017 0
9 ACO 1703 ClG 13 15 05.2 +51 49 02           ~ 120 0
10 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 779 1

    Equat.    Gal    SGal    Ecl

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2020.06.02-10:07:30

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