2013/04/08 by Prateek Sharma, Sharma, Prateek
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.1304.2408
openalex publication_date 2013/04/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Coronae exist in most astrophysical objects: stars, accretion disks, and individual galaxies and clusters of galaxies. Coronae in these varied systems have some common properties: 1) hydrostatic equilibrium in background gravity is a good assumption; 2) they are optically thin, i.e., photons escape as soon as they are born; 3) they have cooling times shorter than their ages, and thus require heating for sustenance. Generally the coronal heating mechanisms are quite complex but the structure of the corona is tightly constrained by the interplay of cooling, \em global heating, and background gravity. We briefly summarize the results from our studies of the intracluster medium (the cluster corona) and draw inferences which should apply to most astrophysical coronae.