Speaker
Yi Zhang
(MPE)
Description
The properties of the hot circumgalactic medium (CGM) help constrain the galaxy evolution models and the bi-modality of the galaxy population, but its observation is challenging. By applying the stacking technique to the X-ray data from four eROSITA all-sky surveys (eRASS:4) and a volume-limited central galaxy sample containing 85,222 galaxies with 10$<\log(M_*)<$11.5, we measure the X-ray surface brightness profiles of the hot CGM and estimate the baryon budget of it. We provide the scaling relationships between the X-ray luminosity of hot CGM and the stellar or halo mass of the galaxies. We discuss if the X-ray emission around star-forming and quiescent galaxies is different and the implication on the galaxy evolution models.
Primary author
Yi Zhang
(MPE)
