Publication details

Relationships between Stellar Velocity Dispersion and the Atmospheres of Early-type Galaxies

Authors

FRISBIE Rachel L. S DONAHUE Megan VOIT G. Mark LAKHCHAURA Kiran WERNER Norbert SUN Ming

Year of publication 2022
Type Article in Periodical
Magazine / Source Astrophysical Journal
MU Faculty or unit

Faculty of Science

Citation
Web https://iopscience.iop.org/article/10.3847/1538-4357/ac4604
Doi http://dx.doi.org/10.3847/1538-4357/ac4604
Keywords Giant elliptical galaxies; Galactic winds; AGN host galaxies; X-ray astronomy; Circumgalactic medium
Description The Voit et al. black hole feedback valve model predicts relationships between stellar velocity dispersion and atmospheric structure among massive early-type galaxies. In this work, we test that model using the Chandra archival sample of 49 early-type galaxies from Lakhchaura et al. We consider relationships between stellar velocity dispersion and entropy profile slope, multiphase gas extent, and the ratio of cooling time to freefall time. We also define subsamples based on data quality and entropy profile properties that clarify those relationships and enable more specific tests of the model predictions. We find that the atmospheric properties of early-type galaxies generally align with the predictions of the Voit et al. model, in that galaxies with a greater stellar velocity dispersion tend to have radial profiles of pressure, gas density, and entropy with steeper slopes and less extended multiphase gas. Quantitative agreement with the model predictions improves when the sample is restricted to have low central entropy and a stellar velocity dispersion of between 220 and 300 km s(-1).
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