plancklens.sims.maps

class plancklens.sims.maps.cmb_maps(sims_cmb_len, cl_transf, nside=2048, cl_transf_P=None, lib_dir=None)

CMB simulation library combining a lensed CMB library and a transfer function.

Parameters:

• sims_cmb_len – lensed CMB library (e.g. plancklens.sims.planck2018_sims.cmb_len_ffp10)

• cl_transf – CMB temperature transfer function

• nside – healpy resolution of the maps. Defaults to 2048.

• lib_dir (optional) – hash checks will be cached, as well as possibly other things for subclasses.

• cl_transf_P – CMB pol transfer function (if different from cl_transf)

get_sim_pmap(idx)

Returns polarization healpy maps for a simulation

Parameters:

idx – simulation index

Returns:

Q and U healpy maps

get_sim_tmap(idx)

Returns temperature healpy map for a simulation

Parameters:

idx – simulation index

Returns:

healpy map

class plancklens.sims.maps.cmb_maps_harmonicspace(sims_cmb_len, cls_transf: dict, cls_noise: dict, noise_phas: lib_phas, lib_dir=None, nside=None)

CMB simulation library combining a lensed CMB library and a transfer function

Note

In this version, maps are directly produced in harmonic space with possibly non-white but stat. isotropic noise

Parameters:

• sims_cmb_len – lensed CMB library (e.g. plancklens.sims.planck2018_sims.cmb_len_ffp10)

• cls_transf – dict with transfer function for ‘t’ ‘e’ and ‘b’ CMB fields

• cls_noise – dict with noise spectra for ‘t’ ‘e’ and ‘b’

• noise_phas – plancklens.sims.phas.lib-phas with at least 3 fields for the random phase library for the noise generation

• lib_dir (optional) – hash checks will be cached, as well as possibly other things for subclasses.

• nside – If provided, maps are returned in pixel space instead of harmonic space

Note

lmax’s of len cmbs and noise phases must match

get_sim_pmap(idx)

Returns polarization healpy maps for a simulation

Parameters:

idx – simulation index

Returns:

Elm and Blm

or Q and U healpy maps if nside is given

get_sim_tmap(idx)

Returns temperature healpy map for a simulation

Parameters:

idx – simulation index

Returns:

Temperature alm’s or Temperature healpy map if nside is given

class plancklens.sims.maps.cmb_maps_nlev(sims_cmb_len, cl_transf, nlev_t, nlev_p, nside, lib_dir=None, pix_lib_phas=None)

CMB simulation library combining a lensed CMB library, transfer function and idealized homogeneous noise.

Parameters:

• sims_cmb_len – lensed CMB library (e.g. plancklens.sims.planck2018_sims.cmb_len_ffp10)

• cl_transf – CMB transfer function, identical in temperature and polarization

• nlev_t – temperature noise level in \(\mu K\)-arcmin

• nlev_p – polarization noise level in \(\mu K\)-arcmin

• nside – healpy resolution of the maps

• lib_dir (optional) – noise maps random phases will be cached there. Only relevant if pix_lib_phas is not set

• pix_lib_phas (optional) – random phases library for the noise maps (from plancklens.sims.phas.py). If not set, lib_dir arg must be set.

get_sim_qnoise(idx)

Returns noise Q-polarization map for a simulation

Parameters:

idx – simulation index

Returns:

healpy map

get_sim_tnoise(idx)

Returns noise temperature map for a simulation

Parameters:

idx – simulation index

Returns:

healpy map

get_sim_unoise(idx)

Returns noise U-polarization map for a simulation

Parameters:

idx – simulation index

Returns:

healpy map

class plancklens.sims.maps.cmb_maps_noisefree(sims_cmb_len, cl_transf, nside=2048, cl_transf_P=None)