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Dark matter halo properties from galaxy-galaxy lensing
Cosmology and Nongalactic Astrophysics · Submitted 25 Mar 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find luminosity scaling relations of \sigma_{red} ~ L^{0.24+-0.03} for the red lens sample, \sigma_{blue} ~ L^{0.23+-0.03} for blue lenses and \sigma ~ L^{0.29+-0.02} for the combined lens sample with zeropoints of \sigma*_{red}=162+-2 km/s, \sigma*_{blue}=115+-3 km/s and \sigma*=135+-2 km/s at a chosen reference luminosity L*_{r'} = 1.6 \times 10^10 h^{-2} L_{r',sun}.
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The abstract, sentence by sentence
We present results for a galaxy-galaxy lensing study based on imaging data from the Canada-France-Hawaii Telescope Legacy Survey Wide. From a 12 million object multi-colour catalogue for 124 deg^2 of photometric data in the u*g'r'i'z' filters we compute photometric redshifts (with a scatter of \sigma_{\Delta z/(1+z)} = 0.033 and an outlier rate of \eta=2.0 per cent for i'<=22.5) and extract galaxy shapes down to i'=24.0. We select a sample of lenses and sources with 0.05 < z_d <= 1 and 0.05 < z_s <= 2. We fit three different galaxy halo profiles to the lensing signal, a singular isothermal sphere (SIS), a truncated isothermal sphere (BBS) and a universal density profile (NFW). We derive velocity dispersions by fitting an SIS out to 100 h^{-1} kpc to the excess surface mass density \Delta\Sigma and perform maximum likelihood analyses out to a maximum scale of 2 h^{-1} Mpc to obtain halo parameters and scaling relations. We find luminosity scaling relations of \sigma_{red} ~ L^{0.24+-0.03} for the red lens sample, \sigma_{blue} ~ L^{0.23+-0.03} for blue lenses and \sigma ~ L^{0.29+-0.02} for the combined lens sample with zeropoints of \sigma*_{red}=162+-2 km/s, \sigma*_{blue}=115+-3 km/s and \sigma*=135+-2 km/s at a chosen reference luminosity L*_{r'} = 1.6 \times 10^10 h^{-2} L_{r',sun}. The steeper slope for the combined sample is due to the different zeropoints of the blue and red lenses and the fact that blue lenses dominate at low luminosities and red lenses at high luminosities. The mean effective redshifts for the lens samples are <z_{red}>=0.28 for red lenses, <z_{blue}>=0.35 for blue lenses and <z>=0.34 for the combined lens sample.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present results for a galaxy-galaxy lensing study based on imaging data from the Canada-France-Hawaii Telescope Legacy Survey Wide. | contribution 0.94 | 0.88 | 0.02 | asserted 0.98 |
| s1 | From a 12 million object multi-colour catalogue for 124 deg^2 of photometric data in the u*g'r'i'z' filters we compute photometric redshifts (with a scatter of \sigma_{\Delta z/(1+z)} = 0.033 and an outlier rate of \eta=2.0 per cent for i'<=22.5) and extract galaxy shapes down to i'=24.0. | method 1.00 | 0.96 | 0.02 | asserted 1.00 |
| s2 | We select a sample of lenses and sources with 0.05 < z_d <= 1 and 0.05 < z_s <= 2. | method 0.99 | 0.93 | 0.02 | asserted 0.96 |
| s3 | We fit three different galaxy halo profiles to the lensing signal, a singular isothermal sphere (SIS), a truncated isothermal sphere (BBS) and a universal density profile (NFW). | method 0.99 | 0.95 | 0.03 | asserted 0.97 |
| s4 | We derive velocity dispersions by fitting an SIS out to 100 h^{-1} kpc to the excess surface mass density \Delta\Sigma and perform maximum likelihood analyses out to a maximum scale of 2 h^{-1} Mpc to obtain halo parameters and scaling relations. | method 1.00 | 0.97 | 0.04 | asserted 0.99 |
| s5 | We find luminosity scaling relations of \sigma_{red} ~ L^{0.24+-0.03} for the red lens sample, \sigma_{blue} ~ L^{0.23+-0.03} for blue lenses and \sigma ~ L^{0.29+-0.02} for the combined lens sample with zeropoints of \sigma*_{red}=162+-2 km/s, \sigma*_{blue}=115+-3 km/s and \sigma*=135+-2 km/s at a chosen reference luminosity L*_{r'} = 1.6 \times 10^10 h^{-2} L_{r',sun}. | result 1.00 | 0.97 | 0.51 | asserted 1.00 |
| s6 | The steeper slope for the combined sample is due to the different zeropoints of the blue and red lenses and the fact that blue lenses dominate at low luminosities and red lenses at high luminosities. | interpretation 1.00 | 0.84 | 0.11 | asserted 1.00 |
| s7 | The mean effective redshifts for the lens samples are <z_{red}>=0.28 for red lenses, <z_{blue}>=0.35 for blue lenses and <z>=0.34 for the combined lens sample. | result 1.00 | 0.94 | 0.05 | asserted 1.00 |
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The paper
Original abstract
We present results for a galaxy-galaxy lensing study based on imaging data from the Canada-France-Hawaii Telescope Legacy Survey Wide. From a 12 million object multi-colour catalogue for 124 deg^2 of photometric data in the u*g'r'i'z' filters we compute photometric redshifts (with a scatter of \sigma_{\Delta z/(1+z)} = 0.033 and an outlier rate of \eta=2.0 per cent for i'<=22.5) and extract galaxy shapes down to i'=24.0. We select a sample of lenses and sources with 0.05 < z_d <= 1 and 0.05 < z_s <= 2. We fit three different galaxy halo profiles to the lensing signal, a singular isothermal sphere (SIS), a truncated isothermal sphere (BBS) and a universal density profile (NFW). We derive velocity dispersions by fitting an SIS out to 100 h^{-1} kpc to the excess surface mass density \Delta\Sigma and perform maximum likelihood analyses out to a maximum scale of 2 h^{-1} Mpc to obtain halo parameters and scaling relations. We find luminosity scaling relations of \sigma_{red} ~ L^{0.24+-0.03} for the red lens sample, \sigma_{blue} ~ L^{0.23+-0.03} for blue lenses and \sigma ~ L^{0.29+-0.02} for the combined lens sample with zeropoints of \sigma*_{red}=162+-2 km/s, \sigma*_{blue}=115+-3 km/s and \sigma*=135+-2 km/s at a chosen reference luminosity L*_{r'} = 1.6 \times 10^10 h^{-2} L_{r',sun}. The steeper slope for the combined sample is due to the different zeropoints of the blue and red lenses and the fact that blue lenses dominate at low luminosities and red lenses at high luminosities. The mean effective redshifts for the lens samples are <z_{red}>=0.28 for red lenses, <z_{blue}>=0.35 for blue lenses and <z>=0.34 for the combined lens sample.
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Furthermore, in Ref. [ref] it was found that red galaxies, which tend to be early type and thus more likely to be strong lenses, have on average larger truncation radii, $s ≈300 h^-1$ kpc.
Large-Distance Lens Uncertainties and Time-Delay Measurements of $H_0$ · Introduction · 0.93
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