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astrosonnen / allZeLenses

Cosmology with every single gravitational lens ever.
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Selection function #14

Open drphilmarshall opened 8 years ago

drphilmarshall commented 8 years ago

Hey @astrosonnen - Tom C has a paper coming out where he and a student look at the impact of selection effects on time delay cosmological inference (he just showed some results here at the H0LiCOW/STRIDES meeting). I think we can speak to their results a bit. The key question is: if we focus primarily on quads, how do we recover from this selection bias? I wonder: do we need to add anything to our analysis to be able to comment on this question?

astrosonnen commented 8 years ago

That's right, so far we've been assuming that the population of massive galaxies and that of time-delay lenses are essentially the same. Or to be precise, we're assuming that the model describing the distribution of lens properties is a fair description of the population of time-delay lenses. There are a couple of things we could do. 1- Include selection effects when making the mocks and see if we can still get an unbiased H0 2- Make an explicit distinction between intrinsic distribution and lensing-selected distribution following Sonnenfeld et al. (2015)