Rachel and a student at Princeton are working on a lensing project using the MaxBCG clusters. We did some comparisons and saw considerable disagreement between the recovered signals. It turns out that during the last iteration of the photozs a bug was introduced that made the colors look really wrong and the photozs too high. This was not in their estimator, but a difference in magnitude systems between training set and my catalog. It was just a confusion of conventions, but of course those can have disturbing consequences
By the way, does anyone read this blog besides my mom?
Erin
This is a daily blog about what I'm doing with my research. It is both to keep others informed and to keep me focused.
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- Erin Sheldon
- Born and raised outside of Verona, Mo population 500. I now live in New York City, pop. 8 million
13 comments:
I read it.
So how does this affect the lensing measurements?
Doug
Looks to be significant, looks like the new masses will be about 40% higher or so.
I read it too. Which photozs do you use? The photoz2 in CatsJob or just photoz in CatsJob?
Jiangang
These are the neural network photozs. I got them directly from Hiro, actually, so I'm not sure what table they correspond to. My guess from glancing at the schema is photoz2.
These are the latest versions, better than the ones currently in the db (at this writing).
Let me clarify that the photozs in the database are not wrong, the reason these were bad is because we ran the neural network on my lensing catalog which had pogson mags instead of the asinh mags ("luptitudes") that the NN was trained on.
I also read it.
Cheers,
Sarah
I read it too. So does this mean WL and velocity dispersions now agree? I forgot in which way they disagreed before. Good work!! Marusa
Well it goes in the right direction and has about the right magnitude. I'm still finalizing the photoz catalog (with help from the Chicago folks), so I'll let you know.
Didn't realize you were anouncing this to the entire community, did you.
This will also help the concentrations come closer to the X-ray measurements.
Doug
It's like making your life open source, or maybe public domain. And research too. Better than being all secretive I say.
Certainly.
Looking forward to the new m200-n200 scaling....
well, i've only been an infrequent reader, but i heard the news from marusa at lunch and came for details. but hey, glad to hear that things are starting to make sense. we've got to start regular phone cons again soon. maybe next week.
Me
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