Lensing measurements of the mass distribution in SDSS voids
Abstract
We measure weak lensing mass profiles of voids from a volume-limited sample of SDSS Luminous Red Galaxies (LRGs). We find voids using an algorithm designed to maximize the lensing signal by dividing the survey volume into 2D slices, and then finding holes in this 2D distribution of LRGs. We perform a stacked shear measurement on about 20 000 voids with radii between 15 and 55 Mpc h-1, and redshifts between 0.16 and 0.37. We measure the characteristic radial shear signal of voids with a signal to noise of 7. The mass profile corresponds to a fractional underdensity of about -0.4 inside the void radius and a slow approach to the mean density indicating a partially compensated void structure. We compare our measured shape and amplitude with the predictions of Krause et al. Voids in the galaxy distribution have been extensively modelled using simulations and measured in the SDSS. We discuss how the addition of void mass profiles can enable studies of galaxy formation and cosmology.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- December 2015
- DOI:
- 10.1093/mnras/stv2215
- arXiv:
- arXiv:1404.1834
- Bibcode:
- 2015MNRAS.454.3357C
- Keywords:
-
- gravitational lensing: weak;
- cosmology: observations;
- dark matter;
- large-scale structure of Universe;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 10 pages, 7 figures