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The 2023 release of Cloudy

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arxiv 2308.06396 v1 pith:GULBPRMH submitted 2023-08-11 astro-ph.GA astro-ph.HE

Marios Chatzikos , Stefano Bianchi , Francesco Camilloni , Priyanka Chakraborty , Chamani M. Gunasekera , Francisco Guzmán , Jonathan S. Milby , Arnab Sarkar
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Gargi Shaw Peter A. M. van Hoof Gary J. Ferland
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classification astro-ph.GAastro-ph.HE
keywords cloudyreleaseadoptdatadatabasedescribeimprovedmolecular
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We describe the 2023 release of the spectral synthesis code Cloudy. Since the previous major release, migrations of our online services motivated us to adopt git as our version control system. This change alone led us to adopt an annual release scheme, accompanied by a short release paper, the present being the inaugural. Significant changes to our atomic and molecular data have improved the accuracy of Cloudy predictions: we have upgraded our instance of the Chianti database from version 7 to 10; our H- and He-like collisional rates to improved theoretical values; our molecular data to the most recent LAMDA database, and several chemical reaction rates to their most recent UDfA and KiDA values. Finally, we describe our progress on upgrading Cloudy's capabilities to meet the requirements of the X-ray microcalorimeters aboard the upcoming XRISM and Athena missions, and outline future development that will make Cloudy of use to the X-ray community.

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