ntsz 1.2

A python 3 implementation for calculation of various Sunyaev -Zeldovich effects.

ntsz

This package enables the compution of the spectral distortion in the specific intensity of the CMB due to the Sunyaev-Zeldovich effect for the following models describing the momenta distribution of the scattering electrons:

1. Maxwell-Juettner distribution with a given kinetic temperature.
2. Single power-law with a minimum and maximum momenta, and an index.
3. Broken power-law with a flat spectrum from minimum to break momentum and then a power-law with a negative index to maximum momentum.

While the first model results in the thermal SZ spectrum with relativistic corrections (referred to as rSZ), the power-law models result in the non-thermal SZ (ntSZ) effect.

Installation

With pip:

pip install ntsz

Test

Test your installation with:

python -m unittest discover

Usage

The example_notebook.ipynb can be used to familiarise oneself with the package. The user is referred to documentation for further information on other tools available with this package.

References

The computation of the SZ spectra follows the formalism described here:

[1] Ensslin & Kaiser (2000): Comptonization of the Cosmic Microwave Background by Relativistic Plasma, arXiv:0001429v2.

The kSZ effect is estimated using the formalism presented in:

[2] Mroczkowski, T., et. al. (2019): Astrophysics with the Spatially and Spectrally Resolved Sunyaev-Zeldovich Effects: A Millimetre/Submillimetre Probe of the Warm and Hot Universe, arXiv:1811.02310.

Acknowledgement

If you found this package useful for your work, please cite the following papers:

[1] Vyoma Muralidhara & Kaustuv Basu (2024): Constraining the average magnetic field in galaxy clusters with current and upcoming CMB surveys, DOI: 10.1088/1475-7516/2024/11/010. BibTex entry:

@article{Muralidhara:2024ipg,
    author = "Muralidhara, Vyoma and Basu, Kaustuv",
    title = "{Constraining the average magnetic field in galaxy clusters with current and upcoming CMB surveys}",
    eprint = "2402.17445",
    archivePrefix = "arXiv",
    primaryClass = "astro-ph.CO",
    doi = "10.1088/1475-7516/2024/11/010",
    journal = "JCAP",
    volume = "11",
    pages = "010",
    year = "2024"
}

[2] Ensslin & Kaiser (2000): Comptonization of the Cosmic Microwave Background by Relativistic Plasma, arXiv:0001429v2. BibTex entry:

@article{Ensslin:2000mk,
    author = "Ensslin, Torsten A. and Kaiser, Christian R.",
    title = "{Comptonization of the cosmic microwave background by relativistic plasma}",
    eprint = "astro-ph/0001429",
    archivePrefix = "arXiv",
    journal = "Astron. Astrophys.",
    volume = "360",
    pages = "417--430",
    year = "2000"
}

License

Copyright 2025 Vyoma Muralidhara.

ntsz is free software made available under the MIT License. For details see the LICENSE file.