Galactic distribution of supernovae and OB associations

Published: 24 February 2025| Version 1 | DOI: 10.17632/hz5vbsvy7d.1
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Description

We update and extend a previous model by Higdon and Lingenfelter for the longitudinal profile of the N II intensity in the Galactic plane. The model is based on four logarithmic spiral arms, to which features like the Local Arm and local sources are added. Connecting then the N II to the H II emission, we use this model to determine the average spatial distribution of OB associations in the Milky Way. Combined with a stellar mass and cluster distribution function, the model predicts the average spatial and temporal distribution of core-collapse supernovae in the Milky Way. In addition to this average population, we account for supernovae from observed OB associations, providing thereby a more accurate description of the nearby Galaxy. The complete model is made publicly available in the python code SNOB.

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Astrophysics, Computational Physics, Galactic Astrophysics, Cosmic Ray, Supernova

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