Hi Jamie,
I don't know whether you discussed your monopole sidelobe sim posting on
the last telecon (I don't see notes on it). But reading your posting here
http://bmode.caltech.edu/~spuder/analysis_logbook/analysis/20130115_monopol…
I had expected you would inject a uniform amplitude A-B monopole
sidelobe into all pixels, not a random distribution as I think you have
done. We discussed that a uniform amplitude would not cause dk
jackknife failures. And obviously it will not average down, as I
suspect is happening to a large degree in your sim.
Quoting from your posting:
"I've completely made up this distribution; it is hard to tell in
Randol's sidelobe maps what the real level of sidelobe mismatch might be."
"It appears that adding a sidelobe does create a small amount of low l
BB power that does not deproject. However, we currently don't have
evidence that we have mismatched A vs B sidelobes, so while such a
effect can create B power, we probably need more evidence from sidelobe
maps as to its existence."
I think this is backwards. The existing near sidelobe analysis don't
offer positive evidence of a ~few degree monopole sidelobe, but what
upper limit it places is unclear--this has never been quantified. So
please plot the A-B beam for the (uniform, not random) monopole sidelobe
amplitude you choose in your sim on the same +/- 5e-3 colorscale and
axes as used in these postings:
http://bmode.caltech.edu/~spuder/analysis_logbook/analysis/20121217_bicep2r…
http://bicep0.caltech.edu/~spuder/analysis_logbook/analysis/20121128_buddy_…
I suggest you choose an amplitude around the level so that it would just
start to be obvious on that colorscale if you added it on top of the
actual measured (tile-stacked) residual A-B structure (e.g. Abby's Fig
1). If you can get the data in that figure and actually plot the sum,
it would be great. I suggest trying 120 arcmin as well as 240 arcmin.
I think if you re-run your sim with these assumptions, it will show us
the signature of a common-mode monopole sidelobe leakage that is *at the
maximum level allowable by our current beam map analysis*. That's what
I want to see.
thanks,
John
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___________________________________________________________________
John Kovac jmkovac(a)cfa.harvard.edu
Assistant Professor, Astronomy and Physics, Harvard University
160 Concord Ave rm 310, Cambridge MA 02138, 617-496-0611