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Reconstruction
Active investigators: Tom, Phil supported by Stefan
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How much of the total external convergence in a time delay lens system comes from visible galaxies? How does this change as a function of magnitude cut?
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Where are the most important galaxies? Do the massive galaxies dominate, or is it the the galaxies nearest the optical axis, or some combination of these?
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How many galaxies account for 50%, and 95% of the convergence on a typical line of sight?
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Can the Hilbert (ray-traced) convergence be recovered by halo model lightcone reconstruction? With what scatter and bias? Which recipes are the dominant sources of these uncertainties?
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MS lightcone exploration is underway: we have initial curves of growth and kappa PDFs, using the Keeton approximation. We see a few galaxies dominate the convergence from within 1 arcminute from the line of sight, but also significant contributions from galaxies outside this aperture. The smooth mass component and correct distances are already a concern. TC, PJM 2012-04-10 Read more...
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Light cone reconstructions from halo (not photometric) catalogs: based on the halo information in the catalogs, we have been "reconstructing" the external convergence at the lightcone centre, still within the Keeton approximation. The halo truncation radius is a key parameter. The mass budget is not yet balanced in these reconstructions - we have a strategy for dealing with the smooth component. TC, PJM 2012-04-24
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We can correct for the smooth component. We've come up with a method to balance the overall mass budget, and inplemented it. The histograms of kappa keeton-hilbert are now centred on 0 (\pm ~0.002), with scatter at the 0.02 level: we've run up against a wall - matter not in the halo catalogue. Read more... . TC 2012-05-22
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Scatter on the Halo Mass decreases the accuracy of kappa reconstruction. We've investigated the effects of introducing scatter to the halo mass. Stefan's catalogue has an interesting M*-Mhalo relation, so we use Behroozi et al. instead. Read more... . TC 2012-06-05
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Satellites and abundance matching. We've investigated the kappa contribution coming from satellites - it can be significant, and it's very hard to reconstruct satellite halo masses with abundance matching. Read more.... TC 2012-06-18
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Kappa pdfs for lightcones. We've tested what happens when halo mass errors are introduced. For most lightcones, there is only a weak dependence on the inferred halo mass, but that's not always the case. Read more... TC 2012-06-28
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Bias and the need to use the correct kappa formalism. If you are reconstructing overdense lines of sight < kappa keeton > is not equal to < kappa add >. We have to use the right one. We've also looked at the bias in assuming =0 to correct for voids. Read more... TC 2012-07-13
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Shear, Long tails and B1608 Read more... TC 2012-08-27
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Paper: figures and conclusions are here TC 2012-10-01
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Regarding Comments click here TC 2012-11-07