Dark Energy Survey Year 1 results: The relationship between mass and light around cosmic voids. (arXiv:1909.01386v1 [astro-ph.CO])
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What are the mass and galaxy profiles of cosmic voids? In this paper we use
two methods to extract voids in the Dark Energy Survey (DES) Year 1 redMaGiC
galaxy sample to address this question. We use either 2D slices in projection,
or the 3D distribution of galaxies based on photometric redshifts to identify
voids. The tangential shear profiles of background galaxies are related to
their excess surface mass density. The signal-to-noise ratio for our lensing
measurement ranges between 10.7 and 14.0 for the two void samples. We infer
their 3D density profiles and find good agreement with N-body simulations for
void radii in the range 15-85 Mpc. Comparison with their galaxy profiles then
allows us to test the relation between mass and light. We find very similar
shapes for the two profiles, consistent with a linear relationship between mass
and light. We validate our analysis with the help of simulated mock catalogues
and estimate the impact of photometric redshift uncertainties on the
measurement. Our methodology can be used for cosmological applications,
including tests of gravity with voids.
What are the mass and galaxy profiles of cosmic voids? In this paper we use
two methods to extract voids in the Dark Energy Survey (DES) Year 1 redMaGiC
galaxy sample to address this question. We use either 2D slices in projection,
or the 3D distribution of galaxies based on photometric redshifts to identify
voids. The tangential shear profiles of background galaxies are related to
their excess surface mass density. The signal-to-noise ratio for our lensing
measurement ranges between 10.7 and 14.0 for the two void samples. We infer
their 3D density profiles and find good agreement with N-body simulations for
void radii in the range 15-85 Mpc. Comparison with their galaxy profiles then
allows us to test the relation between mass and light. We find very similar
shapes for the two profiles, consistent with a linear relationship between mass
and light. We validate our analysis with the help of simulated mock catalogues
and estimate the impact of photometric redshift uncertainties on the
measurement. Our methodology can be used for cosmological applications,
including tests of gravity with voids.
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