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Effects of density and temperature variations on the metallicity of Mrk 71

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Fig. 1: Electron temperature versus electron density for different values of the reddening constant.

Data availability

All the data discussed here were presented by ref. 1.

Code availability

Our results use the PyNeb code, publicly available on GitHub: https://github.com/Morisset/PyNeb_devel.

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Acknowledgements

J.E.M.-D. and K.K. gratefully acknowledge funding from the German Research Foundation in the form of an Emmy Noether Research Group (grant no. KR4598/2-1, PI Kreckel). K.K. additionally gratefully acknowledges funding from the European Research Council’s starting grant (grant no. ERC StG-101077573, ISM-METALS). C.E. and J.G.-R. acknowledge support from the Spanish Research Agency of the Ministry of Science, Innovation and Universities (MCIU) under grant Espectroscopía de campo integral de regiones H ii locales. Modelos para el estudio de regiones H ii extragalácticas (grant ref. 10.13039/501100011033) and support (grant no. P/308614), which is financed by the MCIU and charged to the General State Budgets and by the General Budgets of the Autonomous Community of the Canary Islands by the MCIU. J.G.-R. acknowledges support from an advanced fellowship under the Severo Ochoa excellence programme (ref. CEX2019-000920-S) and financial support from the Canarian Agency for Research, Innovation and Information Society of the Canary Islands Government and from the European Regional Development Fund (grant ref. ProID2021010074).

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Authors and Affiliations

  1. Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Heidelberg, Germany

    J. Eduardo Méndez-Delgado & Kathryn Kreckel

  2. Instituto de Astrofísica de Canarias (IAC), Santa Cruz de Tenerife, Spain

    César Esteban & Jorge García-Rojas

  3. Departamento de Astrofísica, Universidad de La Laguna, Santa Cruz de Tenerife, Spain

    César Esteban & Jorge García-Rojas

  4. Instituto de Astronomía, Universidad Nacional Autónoma de México, Mexico City, Mexico

    Manuel Peimbert

Authors
  1. J. Eduardo Méndez-Delgado
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  2. César Esteban
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  3. Jorge García-Rojas
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  4. Kathryn Kreckel
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  5. Manuel Peimbert
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Contributions

J.E.M.-D. led the analysis and writing of the manuscript. C.E., J.G.-R., K.K. and M.P. provided critical feedback and modified the text.

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Correspondence to J. Eduardo Méndez-Delgado.

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Méndez-Delgado, J.E., Esteban, C., García-Rojas, J. et al. Effects of density and temperature variations on the metallicity of Mrk 71. Nat Astron 8, 275–277 (2024). https://doi.org/10.1038/s41550-024-02198-8

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