Exploring effects on magnifications due to line-of-sight galaxies in the Hubble Frontier Fields
Autor: | Sean R. Brennan, Catie Raney, Charles R. Keeton |
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Rok vydání: | 2019 |
Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Line-of-sight Field (physics) 010308 nuclear & particles physics Plane (geometry) FOS: Physical sciences Magnification Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Redshift Galaxy Space and Planetary Science Position (vector) Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Cluster (physics) 010303 astronomy & astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics |
Zdroj: | Monthly Notices of the Royal Astronomical Society. 492:503-527 |
ISSN: | 1365-2966 0035-8711 |
Popis: | Cluster lensing has become an important tool in the search for high redshift galaxies through its ability to magnify sources. In order to determine the intrinsic properties of these galaxies, lensing mass models must be constructed to determine the magnification of the images. These models are traditionally two-dimensional, focusing on the mass within the cluster and either ignoring or approximating any contribution from line-of-sight galaxies. In this paper, we present the first full set of three-dimensional mass models of the six Hubble Frontier Fields and use them to test for systematic biases in magnifications due to using the traditional 2D approach. We find that omitting foreground or background galaxies causes image position offsets between 0.1-0.4", a non-negligible fraction of the typical 0.3-0.7" residuals of current state-of-the-art models. We also find that median image magnifications can shift by up to 6%, though it is dependent on the field. This can be alleviated in some cases by approximating the mass in the lensing plane, but a 5% magnification bias still exists in other cases; image position offsets are also improved, but are still present at 0.10". Comment: 26 pages, 9 figures, 14 tables. Accepted for publication in MNRAS |
Databáze: | OpenAIRE |
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