Speaker
Description
The hot circumgalactic medium (CGM) is believed to host most of the baryons and metals that are missing from the stellar disk and ISM. However, detecting the hot CGM is extremely challenging due to its faintness and the complexity of the background in mm and X-ray. We have cross-correlated the WISExSuperCosMos galaxy catalog with the Compton-y map derived from the CMB data of the Atacama Cosmology TelescopexPlanck to estimate the thermal pressure of the CGM of 0.63 million L* spiral galaxies. The thermal energy of the CGM of these galaxies evolves more strongly with mass than the self-similar relation of purely gravity-driven halos. We have also found a non-monotonic trend of baryon fraction as a function of mass, with a certain mass range being baryon sufficient. We complement the tSZ stacking analyses with deep X-ray observations of individual galaxies. By carefully selecting an optimum target, devising a novel method, and performing two independent analyses of our Suzaku and XMM-Newton data, we have detected the emission from the hot CGM of a star-forming spiral galaxy at 4sigma significance. The mass of the detected hot CGM is sufficient to account for the missing galactic baryons. Our results provide insights into the impact of galactic feedback on the hot CGM and set a benchmark for designing experiments with next-generation mm and X-ray facilities.
| Would you be interested in presenting a poster if the conference is oversubcribed? | No |
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