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The effect of low-mass substructures on the cusp lensing relation


Maccio, A V; Miranda, M (2006). The effect of low-mass substructures on the cusp lensing relation. Monthly Notices of the Royal Astronomical Society, 368(2):599-608.

Abstract

It has been argued that the flux anomalies detected in gravitationally lensed quasi-stellar objects (QSOs) are evidence for substructures in the foreground lensing haloes. In this paper, we investigate this issue in greater detail, focusing on the cusp relation which corresponds to images of a source located to the cusp of the inner caustic curve. We use numerical simulations combined with a Monte Carlo approach to study the effects of the expected power-law distribution of substructures within Λ cold dark matter (ΛCDM) haloes on the multiple images. Generally, the high number of anomalous flux ratios in the cusp configurations is unlikely to be explained by ‘simple' perturbers (subhaloes) inside the lensing galaxy, modelled by either point masses or extended Navarro, Frenk & White subhaloes. We considered in our analysis a mass range of 105-107 M⊙ for the subhaloes. We also demonstrate that including the effects of the surrounding mass distribution, such as other galaxies close to the primary lens, does not change the results. We conclude that triple images of lensed QSOs do not show any direct evidence for dark dwarf galaxies such as CDM substructure

Abstract

It has been argued that the flux anomalies detected in gravitationally lensed quasi-stellar objects (QSOs) are evidence for substructures in the foreground lensing haloes. In this paper, we investigate this issue in greater detail, focusing on the cusp relation which corresponds to images of a source located to the cusp of the inner caustic curve. We use numerical simulations combined with a Monte Carlo approach to study the effects of the expected power-law distribution of substructures within Λ cold dark matter (ΛCDM) haloes on the multiple images. Generally, the high number of anomalous flux ratios in the cusp configurations is unlikely to be explained by ‘simple' perturbers (subhaloes) inside the lensing galaxy, modelled by either point masses or extended Navarro, Frenk & White subhaloes. We considered in our analysis a mass range of 105-107 M⊙ for the subhaloes. We also demonstrate that including the effects of the surrounding mass distribution, such as other galaxies close to the primary lens, does not change the results. We conclude that triple images of lensed QSOs do not show any direct evidence for dark dwarf galaxies such as CDM substructure

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:National licences > 142-005
Dewey Decimal Classification:530 Physics
Language:English
Date:11 May 2006
Deposited On:24 Oct 2018 15:40
Last Modified:17 Sep 2019 19:30
Publisher:Oxford University Press
ISSN:0035-8711
OA Status:Green
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1111/j.1365-2966.2006.10154.x
Related URLs:https://www.swissbib.ch/Search/Results?lookfor=nationallicenceoxford101111j13652966200610154x (Library Catalogue)

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