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Significance Maps Question 
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#1
Jun1614, 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 


#3
Jun1714, 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 


#4
Jun1714, 05:30 PM

Mentor
P: 11,872

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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