The interactions between gas and galaxies are of paramount importance to our understanding of structure formation. The galactic baryon cycle takes place in the immediate surroundings of galaxies, named the circumgalactic medium (CGM).

More than a decade of deep spectroscopic surveys of galaxies, absorption line studies in quasar spectra and sophisticated numerical simulations have placed interactions between galaxies and the CGM at the centre of our quest to understand the formation of galaxies and the growth of the cosmic web. However, until very recently, the hot phase of the CGM was the least known of the gas phases surrounding galaxies despite being most likely the dominant share of CGM gas by mass.

The goal of the session is to establish new inter-disciplinary, multi-wavelength collaborations to build a better understanding of the physics of the hot phase of the CGM and its role in holistic views of galaxy formation and evolution. In this EAS lunch session, we will discuss new observational advances on the hot phase of the CGM in our Milky Way, nearby galaxies and in the general galaxy population and how they relate to other phases of the CGM. We will then discuss the implication of these observations in the multi-phase CGM paradigm and in the light of current and upcoming hydrodynamical cosmological simulations.

Programme

• N Locatelli (invited). Hot news from the circumgalactic medium.
• M Damle. The warm-hot and hot CGM of simulated galaxies (Cancelled)
• X Zheng. SRG/eROSITA eRASS1 maps of the X-ray diffuse emission: broad band and narrow emission lines
• F Nicastro. Detection of the Galaxy's Missing Baryons in the CGM of three L* Galaxies (Cancelled)
• N Truong (invited). X-ray imprints of supermassive black hole driven outflows on the circumgalactic medium
• Y Zhang. Population study of hot gas around z<0.1 galaxies with eROSITA
• D Nelson. Observing the hot CGM with resonant X-ray emission
• S Shreeram. Modelling the X-ray emission of Milky Way analogs embedded in large-scale structures

Invited speakers

• Nicola Locatelli (MPE, Garching, Germany)
• Nhut Truong (MPIA, Heidelberg, Germany)

Scientific organisers

Johan Comparat (M, MPE, Germany), Annalisa Pillepich (W, MPIA, Germany), Celine Peroux (W, ESO, Germany), Gabriele Ponti (M, INAF, Italy), Paola Popesso (W, ESO, Germany), Andrea Merloni (M, MPE, Germany), Freeke van de Voort (Cardiff University, UK)

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