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Weak Lensing by Line-of-sight Halos as the Origin of Flux-ratio Anomalies in Quadruply Lensed QSOs
Cosmology and Nongalactic Astrophysics · Submitted 9 Jul 2012
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Using an extrapolated matter power spectrum, we demonstrate that small halos or sub-halos in the line-of-sight with a mass of M=10^3-10^7 solar mass, or structures with a comoving wavenumber of k=3*10^2-10^4 h/Mpc can significantly affect the magnification ratios of the lensed images.
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The abstract, sentence by sentence
We explore the weak lensing effect by line-of-sight halos and sub-halos with a mass of M < 10^7 solar mass in QSO-galaxy strong lens systems with quadruple images in a concordant LCDM universe. Using a polynomially fitted non-linear power spectrum P(k) obtained from N-body simulations that can resolve halos with a mass of M ~ 10^5 solar mass, or structures with a comoving wavenumber of k ~ 3*10^2 h/Mpc, we find that the ratio of magnification perturbation due to intervening halos to that of a primary lens is typically ~10 per cent and the predicted values agree well with the estimated values for 6 observed QSO-galaxy lens systems with quadruple images in the mid-infrared band without considering the effects of substructures inside a primary lens. We also find that the estimated amplitudes of convergence perturbation for the 6 lenses increase with the source redshift as predicted by theoretical models. Using an extrapolated matter power spectrum, we demonstrate that small halos or sub-halos in the line-of-sight with a mass of M=10^3-10^7 solar mass, or structures with a comoving wavenumber of k=3*10^2-10^4 h/Mpc can significantly affect the magnification ratios of the lensed images. Flux ratio anomalies in QSO-galaxy strong lens systems offer us a unique probe into clustering property of mini-halos with a mass of M < 10^6 solar mass.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We explore the weak lensing effect by line-of-sight halos and sub-halos with a mass of M < 10^7 solar mass in QSO-galaxy strong lens systems with quadruple images in a concordant LCDM universe. | contribution 0.99 | 0.84 | 0.06 | unclear 0.46 |
| s1 | Using a polynomially fitted non-linear power spectrum P(k) obtained from N-body simulations that can resolve halos with a mass of M ~ 10^5 solar mass, or structures with a comoving wavenumber of k ~ 3*10^2 h/Mpc, we find that the ratio of magnification perturbation due to intervening halos to that of a primary lens is typically ~10 per cent and the predicted values agree well with the estimated values for 6 observed QSO-galaxy lens systems with quadruple images in the mid-infrared band without considering the effects of substructures inside a primary lens. | result 0.95 | 0.96 | 0.44 | asserted 1.00 |
| s2 | We also find that the estimated amplitudes of convergence perturbation for the 6 lenses increase with the source redshift as predicted by theoretical models. | result 1.00 | 0.95 | 0.09 | asserted 1.00 |
| s3 | Using an extrapolated matter power spectrum, we demonstrate that small halos or sub-halos in the line-of-sight with a mass of M=10^3-10^7 solar mass, or structures with a comoving wavenumber of k=3*10^2-10^4 h/Mpc can significantly affect the magnification ratios of the lensed images. | result 0.96 | 0.92 | 0.39 | asserted 0.99 |
| s4 | Flux ratio anomalies in QSO-galaxy strong lens systems offer us a unique probe into clustering property of mini-halos with a mass of M < 10^6 solar mass. | interpretation 0.95 | 0.23 | 0.48 | asserted 0.84 |
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The paper
Original abstract
We explore the weak lensing effect by line-of-sight halos and sub-halos with a mass of M < 10^7 solar mass in QSO-galaxy strong lens systems with quadruple images in a concordant LCDM universe. Using a polynomially fitted non-linear power spectrum P(k) obtained from N-body simulations that can resolve halos with a mass of M ~ 10^5 solar mass, or structures with a comoving wavenumber of k ~ 3*10^2 h/Mpc, we find that the ratio of magnification perturbation due to intervening halos to that of a primary lens is typically ~10 per cent and the predicted values agree well with the estimated values for 6 observed QSO-galaxy lens systems with quadruple images in the mid-infrared band without considering the effects of substructures inside a primary lens. We also find that the estimated amplitudes of convergence perturbation for the 6 lenses increase with the source redshift as predicted by theoretical models. Using an extrapolated matter power spectrum, we demonstrate that small halos or sub-halos in the line-of-sight with a mass of M=10^3-10^7 solar mass, or structures with a comoving wavenumber of k=3*10^2-10^4 h/Mpc can significantly affect the magnification ratios of the lensed images. Flux ratio anomalies in QSO-galaxy strong lens systems offer us a unique probe into clustering property of mini-halos with a mass of M < 10^6 solar mass.
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References
How the literature uses it
7 arXiv papers cite this in 13 sentences
Papers citing it · 9 sentences without a confident label
Builds on it 1 paper
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We have extended the previous works in the CDM and WDM models [ref] to include the MDM model by using the same semi-analytic formulation.
Constraints on mixed dark matter from anomalous strong lens systems · Conclusion and Discussion · 1.00
Uses its method or tool 3 papers
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To quantify the probability of reproducing the observed flux ratios in a given model, we use the method derived in [ref] .
Constraints on long-lived electrically charged massive particles from anomalous strong lens systems · Lens analysis and result · 1.00
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For details, we refer the readers to [ref] , in which the same method is used as that given in [ref] .
Constraints on mixed dark matter from anomalous strong lens systems · Magnification perturbation · 0.97
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We use the HaloFit model [ref] with $k_UV=320h ^-1$.
Lensing dispersion of SNIa and small scales of the primordial power spectrum · Lensing Dispersion of SNIa · 0.99
What it cites · 1 sentence without a confident label
Uses data or values from 1 paper
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We also use simulation results by [ref] .
Revising the Halofit Model for the Nonlinear Matter Power Spectrum · Non-linear power spectrum · 0.89
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