noise and beam in simulated CMB maps
Posted: September 27 2004
I'm making simulated maps of the CMB with SZ effect.
I want to add Gaussian noise and convolve the image with a Gaussian
instrument beam.
The standard lore is that the effect of noise and beam
is to add a noise term with a simple power spectrum depending
on noise amplitude and beam FWHM.
Is this also true in the case with SZ contamination in the map?
In other words, will the noise covariance of my simulated maps,
after adding CMB and noise in each pixel then beam smearing,
be the same as the usual noise covariance?
Also, should I add noise to the pixels then beam smear, or the other way
round (or does it not matter)?
Maybe somebody who's done this before can let me know the secret.
Cheers.
I want to add Gaussian noise and convolve the image with a Gaussian
instrument beam.
The standard lore is that the effect of noise and beam
is to add a noise term with a simple power spectrum depending
on noise amplitude and beam FWHM.
Is this also true in the case with SZ contamination in the map?
In other words, will the noise covariance of my simulated maps,
after adding CMB and noise in each pixel then beam smearing,
be the same as the usual noise covariance?
Also, should I add noise to the pixels then beam smear, or the other way
round (or does it not matter)?
Maybe somebody who's done this before can let me know the secret.
Cheers.