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- W3196837045 abstract "We report the first measurement of lensing power spectra for gravitational potential, astrometric shifts, and convergence perturbations towards the anomalous quadruply lensed quasar MG$,$J0414+0534. To obtain the spectra, we conducted observations of MG$,$J0414+0534 using the Atacama Large Millimeter/submillimeter Array (ALMA) with high angular resolution (0.02-0.05 arcsec). We developed a new method in which Fourier coefficients of potential perturbation are adjusted to minimise the difference between linear combinations of weighted mean de-lensed images. Noise cancellation due to synthesised de-lensed images makes our method suitable for systems with extended images obtained from interferometres. Using positions of radio jet components, extended dust emission on scales $>1,$kpc, and mid-infrared flux ratios, which are microlensing free, our new multi-wavelength method provides us with a very effective tool for probing cosmological matter fluctuations on scales $lesssim 10,$kpc. Assuming that contributions from structures on angular scales $lesssim 1.0$ arcsec are negligible, on an angular scale of $sim 1.3$ arcsec (corresponding to an angular wave number of $l sim 1.1times 10^6$ or $sim 8,$kpc in the lens plane), the measured convergence, astrometric shift, and potential powers are $varDelta_kappa=0.02-0.025$, $varDelta_alpha =7-8,$mas, and $varDelta_psi=1.1-1.5,$$textrm{mas}^2$, respectively. Our result is consistent with the predicted abundance of haloes in the line of sight and subhaloes in cold dark matter models. Our lens models suggest a presence of a clump in the vicinity of object Y (inoue2017), a possible dusty dwarf galaxy. Although much fainter than the previous report, we confirmed weak continuum emission from object Y with a peak flux of $sim 100,mu textrm{Jy}, textrm{beam} ^{-1}$ at the $sim 4,sigma$ level." @default.
- W3196837045 created "2021-09-13" @default.
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- W3196837045 date "2021-09-02" @default.
- W3196837045 modified "2023-10-16" @default.
- W3196837045 title "ALMA Measurement of 10 kpc-scale Lensing Power Spectra towards the Lensed Quasar MG J0414+0534" @default.
- W3196837045 hasPublicationYear "2021" @default.
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