Measuring the mass distribution of voids with stacked weak lensing - 4 views

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  #1 Thomas Collett on 20 Apr 13

   

  http://voxcharta.org/2013/03/25/measuring-the-mass-distribution-of-voids-with-stacked-weak-lensing-replacement/

   

  <div class="cArrow"> </div><div class="cContentInner"><a href="http://voxcharta.org/2013/03/25/measuring-the-mass-distribution-of-voids-with-stacked-weak-lensing-replacement/" rel="nofollow" target="_blank">http://voxcharta.org/2013/03/25/measuring-the-mass-distribution-of-voids-with-stacked-weak-lensing-replacement/</a></div>

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  #2 Thomas Collett on 20 Apr 13

   

  Higuchi et al. want to detect the signal of voids in large weak lensing data. They use N body simulations, and a clever void finder to make a huge stack of voids; this gives a detectable weak lensing signal but only at 5sigma significance for 5000 sqdegree (i.e. the void effect is small compared to other noise in the weak lensing reconstruction [or possibly the void model used isn't very good, given the number of voids stacked]). They find that voids are surrounded by over-dense ridges that have an important effect on the weak lensing signal due to voids. They forecast a 3 sigma detection for an upcoming HSC weak lensing survey.
  
  The void finder looks like it could be a useful tool for people trying to reconstruct the weak lensing convergence/magnification along specific lines of sight. (Although I suspect we still need a better understanding of the outskirts of halos, before we should worry about voids)

   

  <div class="cArrow"> </div><div class="cContentInner">Higuchi et al. want to detect the signal of voids in large weak lensing data. They use N body simulations, and a clever void finder to make a huge stack of voids; this gives a detectable weak lensing signal but only at 5sigma significance for 5000 sqdegree (i.e. the void effect is small compared to other noise in the weak lensing reconstruction [or possibly the void model used isn't very good, given the number of voids stacked]). They find that voids are surrounded by over-dense ridges that have an important effect on the weak lensing signal due to voids. They forecast a 3 sigma detection for an upcoming HSC weak lensing survey. <br /> <br /> The void finder looks like it could be a useful tool for people trying to reconstruct the weak lensing convergence/magnification along specific lines of sight. (Although I suspect we still need a better understanding of the outskirts of halos, before we should worry about voids)</div>

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