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Extragalactic emission with Websky

Tag: mbs-s0005-20190520

Release date 20 May 2019

The last version of this file is available on Github. The same folder contains all the configuration files used and the scripts to create SLURM jobs.

Input components

Each component is saved separately, all maps are in uK_CMB, I or IQU, single precision (float32)

The CIB, KSZ and TSZ models are created from WebSky cosmological simulations, we also include one CMB realization generated with the same cosmological parameters used in the WebSky simulations both unlensed and lensed with the potential from the WebSky simulations, see more details in in the documentation.

These maps are full-sky, you can get the noise maps from the 201901_gaussian_fg_lensed_cmb_realistic_noise simulations to add noise and apply the cut from the scanning strategy. Another option, if you are interested only in the sky cut, is to use the SONoiseSimulator class from mapsims, select nside and scanning_strategy and access the hitmap attribute.

Available maps

HEALPix maps at high resolution (nside 4096) and low resolution (nside 512), these models are deterministic, so we have a set for each resolution for all channels.

Reference frame for the maps is Equatorial. No coordinate transformation was applied in running the simulations from the input websky, websky has no intrinsinc connection with any reference frame, so we chose to use it as Equatorial. This looked like a good idea, however it creates an issue, if someone now runs a PySM simulation with a galactic component, let's say SO_d0 and WebSkyCIB and choose output in equatorial, WebSkyCIB will be different from these simulations.

Bandpass for each channel is a delta function centered at the reference frequency. Beams as defined in the SO_Noise_Calculator released in October 2018. The ell_max for the harmonics transform is 3*Nside-1

Location at NERSC:

/project/projectdirs/sobs/v4_sims/mbs/201905_extragalactic

The naming convention is:

{output_nside}/{content}/{num:04d}/simonsobs_{content}_uKCMB_{telescope}{band:03d}_nside{nside}_{num:04d}.fits"

where:

  • content is in [cib, ksz, tsz, cmb, cmb_unlensed]
  • num is 0
  • telescope is sa or la
  • band is the channel frequency in GHz

Backed up to tape in ~zonca/sobs/mbs/201905_extragalactic.

Issues or feedback

In case of any problem with the maps or the documentation or request more/different runs, open an issue on the map_based_simulations repo

Plots

See the plot_maps.ipynb notebook in the folder, executed notebooks:

Software

Performance

CIB/KSZ/TSZ at 4096 with lmax to 3*nside each frequency channel (e.g. LA_27, SA_27): 1 minute single node on Popeye (SDSC), possibly very quick because it is temperature only. At 512 1 minute all channels.