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Significance Maps Question

by vaart
Tags: maps, significance
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vaart
#1
Jun16-14, 07:19 AM
P: 7
Dear All,

I have a question regarding the understanding of anisotropy of cosmic rays and how to understand them better. To determine the anisotropy I have seen a lot of papers where they use maps that have a Relative Intensity map and a Statistical significance map of the sky.

I understand the relative intensity map, but I don't understand why the statistical significance maps are used, could some one explain this to me?

Thanks,

caart
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Drakkith
#2
Jun16-14, 03:13 PM
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Hmmm... do you happen to have a link to one of the maps?
vaart
#3
Jun17-14, 06:30 AM
P: 7
Sure, here is a paper that I have been recently reading.
http://arxiv.org/abs/1105.2326
It's figure 3 at page 15.
At section 3.2, they are explained but I don't really understand it yet, they say that they use the Li and Ma paper:
http://articles.adsabs.harvard.edu/c...&filetype=.pdf

Drakkith
#4
Jun17-14, 05:30 PM
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Significance Maps Question

I'm actually not certain. At first glance I would think that the significance level depends on the intensity of the radiation and the observation time, with a higher significance corresponding to a higher chance that the signal is real and not a background fluctuation, but I'm not sure why the significance level goes into the negative.


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