Seminar @ DF-AS - P- Singh - X-ray and SZ constraints on the properties of hot gas in galaxies

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Event starting on: 
05/02/2018 - 11:30
Event until: 
05/02/2018 - 12:30
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The hot (T>10^6 K), diffuse gaseous medium in galaxies, also referred to as Circumgalactic medium (CGM), is a huge reservoir of galactic baryons. It is also poised to be a potential reservoir of galactic missing baryons. The hot CGM manifests itself in thermal SZ effect as well as X-ray emission. However, it is difficult to detect these signals from individual galaxies due to the low gas density. There have been recent detections of the stacked thermal SZ and X-ray emission from massive galaxies (M_vir ~ 10^12-10^13 M_sun). We use these measurements to constrain the amount and distribution of the hot CGM. We find that a simple power law distribution of the gas (ne prop r^-1.2) can explain these measurements well. Our model predicts that hot CGM contains approximately 20-30% of the baryon budget in massive galaxies. Our predictions of the mass contained in hot CGM are comparable to the previous estimates of mass contained in other cooler phases of the CGM.


Villa Bazzoni

Alex Saro
Last update: 04-26-2018 - 14:18