- #1
tjsotherone
- 3
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Hi,
I'm hoping someone can point me in the right direction please.
I'm using the Planck 2015 CMB temperature (intensity) SMICA pipeline maps (Nside = 2048) and am trying to determine the temperature variance of each individual pixel. Variance and hit-count were provided with the 2013 CMB maps (there were 3 columns: intensity, hit-count and variance) but they aren't in the 2015 maps (there is only an intensity column).
I've tried to estimate the variance from the half-difference of the half-mission and half-ring maps but my results look dodgy. I'm also very aware of the caution the Planck collaboration urge using these maps to estimate noise, and this approach doesn't feel well physically or statistically motivated to me.
There must have been hundreds of people using the Planck 2015 maps and I would imagine many of them would need to estimate temperature variance. But I can't find a standard/official approach in the literature or online. In fact, wherever I can find mention of variance it is usually rather vague and certainly not detailed enough for me to replicate the calculations.
Does anyone know whether the Planck collaboration have released the temperature variances? And if not, do you know if there is there a recommended method to derive them?
Many thanks,
Tracey.
I'm hoping someone can point me in the right direction please.
I'm using the Planck 2015 CMB temperature (intensity) SMICA pipeline maps (Nside = 2048) and am trying to determine the temperature variance of each individual pixel. Variance and hit-count were provided with the 2013 CMB maps (there were 3 columns: intensity, hit-count and variance) but they aren't in the 2015 maps (there is only an intensity column).
I've tried to estimate the variance from the half-difference of the half-mission and half-ring maps but my results look dodgy. I'm also very aware of the caution the Planck collaboration urge using these maps to estimate noise, and this approach doesn't feel well physically or statistically motivated to me.
There must have been hundreds of people using the Planck 2015 maps and I would imagine many of them would need to estimate temperature variance. But I can't find a standard/official approach in the literature or online. In fact, wherever I can find mention of variance it is usually rather vague and certainly not detailed enough for me to replicate the calculations.
Does anyone know whether the Planck collaboration have released the temperature variances? And if not, do you know if there is there a recommended method to derive them?
Many thanks,
Tracey.