DOI: 10.5281/zenodo.10736552
title: Disentangling the Galactic Faraday sky

description: Sky maps of Hutschenreuter et al. (2023)

See https://arxiv.org/abs/2304.12350.

This data set contains the statistical results for 5 different sky models, namely: 



The integrated LoS component of the Galactic magnetic field, weighted by electron density 

The LoS-integrated electron density of the Milky Way, i.e. the Galactic dispersion measure 

The integrated squared electron density of the Milky Way, i.e. the Galactic emission measure

Conversion factor between squared DM and EM, can be interpreted as the length of the LoS in ideal conditions

Conversion factor between EM and DM, can be interpreted as the LoS-averaged electron density of the Milky Way in ideal conditions


The results for these models are provided by reporting sky maps of the posterior mean and the corresponding standard deviation.Note that the uncertainties of individual pixels and the different sky maps are correlated, for a detailed analysis using the posterior samples is recommended.These are provided for the integrated LoS component of the Galactic magnetic field, the logartihmic DM and the logarithmic L_DM2EM. From those, the uncertainties of all other sky maps can be estimated using the equations in the paper.

Mean and uncertainties are also provided in fits file format, for convenience.

All results are provided under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0). 

The hdf5 files are organised as follows:

<name>_mean_std.hdf5 

  Attributes:   - reference: https://arxiv.org/abs/2304.12350   - license: Provided under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0).    - description: Sampled posterior mean and variance of the <model description>    - name: <name>   - unit: <physical unit of the sky maps> 

  Contains:    - mean:      Contains the posterior mean as a one-dimensional array of float64 with 786432 entries.       This conforms to a HealPix map with nside parameter 256 and in RING ordering.

      Attributes:        - information: contains the above paragraph as a string.        - unit: <physical unit of the sky maps>         - size: 786432        - nside: 256        - ordering: RING        - dtype: float64        - coordinate system: G        - std:      Contains the posterior one sigma uncertainty estimates of the <name> sky model as a one-dimensional array of float64 with 786432 entries.       This conforms to a HealPix map with nside parameter 256 and in RING ordering.      Note that the uncertainties of individual pixels are correlated, for a detailed analysis using the posterior samples is recommended, which are provided.)            Attributes:        - information: contains the above paragraph as a string.        - unit: <physical unit of the sky maps>         - size: 786432        - nside: 256        - ordering: RING        - dtype: float64        - coordinate system: G    

<name>_sample.hdf5

  Attributes:   - reference: https://arxiv.org/abs/2304.12350   - license: Provided under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0).    - description: Sampled posterior mean and variance of the <model description>    - name: <name>   - unit: <physical unit of the sky maps>    - coordinate

  Contains for each sample i :         - sample_i:      Contains sample i as a one-dimensional array of float64 with 786432 entries.       This conforms to a HealPix map with nside parameter 256 and in RING ordering.

      Attributes:        - information: contains the above paragraph as a string.        - unit: <physical unit of the sky maps>         - size: 786432        - nside: 256        - ordering: RING        - dtype: float64        - coordinate system: G