The SRG/eROSITA All-Sky Survey: Constraints on AGN Feedback in Galaxy Groups
arxiv(2024)
摘要
We investigate the impact of AGN feedback, on the entropy and characteristic
temperature measurements of galaxy groups detected in the SRG/eROSITA's first
All-Sky Survey (eRASS1) to shed light on the characteristics of the feedback
mechanisms. We analyze deeper eROSITA observations of 1178 galaxy groups
detected in eRASS1. We divide the sample into 271 subsamples and extract
average thermodynamic properties, including electron density, temperature, and
entropy at three characteristic radii along with the integrated temperature by
jointly analyzing X-ray images and spectra following a Bayesian approach. We
present the tightest constraints on the impact of AGN feedback through our
average entropy and characteristic temperature measurements of the largest
group sample used in X-ray studies, incorporating major systematics in our
analysis. We find that entropy shows an increasing trend with temperature in
the form of a power-law-like relation at the higher intra-group medium
temperatures, while for the low mass groups, a slight flattening is observed on
the average entropy. Overall, the observed entropy measurements agree well with
the earlier measurements in the literature. The comparisons with the
state-of-the-art cosmological hydrodynamic simulations (MillenniumTNG,
Magneticum, OWL simulations) after the applications of the selection function
calibrated for our galaxy groups reveal that observed entropy profiles in the
cores are below the predictions of simulations. At the mid-region, the entropy
measurements agree well with the Magneticum simulations, whereas the
predictions of MillenniumTNG and OWL simulations fall below observations. At
the outskirts, the overall agreement between the observations and simulations
improves, with Magneticum simulations reproducing the observations the best.
Our measurements will pave the way for more realistic AGN feedback
implementations in simulations.
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