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ESO Garching, December 6-9, 2022.

Modeling the mechanisms, AGN or stellar feedback, that expel baryons from collapsed structures and trigger the baryonic exchange, represent at the moment the major strength but also the greatest weakness of our paradigm of galaxy formation and evolution. While nearly all models are able to reproduce many observables, such as the evolution of the galaxy stellar mass function, and the hot gas content of massive clusters, they diverge by large factors on the amount and distribution of the baryonic mass of the low mass halos and the mass, temperature and metal gradient of the circus-galactic medium (CGM) of the central galaxy. Different implementations of the feedback might lead to strikingly divergent predictions. Furthermore, observationally the questions remain of when, where, and how much energy is distributed into different environments. Thus, having an observational constraint on the AGN feedback-gas interplay at all scales is of tremendous importance for the correct modeling not only of galaxy evolution but of the large-scale structures formation and evolution itself.

The workshop aims at reviewing the latest results of the X-ray and SZ data able to characterize the hot phase of the elusive intra-group and circum-galactic medium in low mass halos. eROSITA, particularly sensitive in the soft X-ray band, revealed to be a perfect “filament & group finding machine” and is providing exciting results in this respect. In addition, the large effort of dedicated upcoming deep XMM surveys of local groups and ongoing stacking analysis of existing SZ datasets will make possible to extend our knowledge of the hot gas in the viral and circum-galactic region as never before. Furthermore, the availability of IFU observations from ESO/MUSE, ESO/KMOS, KCWI, HST/COS, Alma data and LOFAR radio data will enable revealing the multiphase nature of the CGM and its interconnection with the halo gas on larger scale, and with the central AGN and galactic component on smaller scale. By reviewing such new results and by comparing them with the current predictions, the MMC workshop will create a clear picture of where we stand in our understanding of the interplay between AGN feedback and gas in the bulk of the virialized dark matter halo population.

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