Astronomy & Astrophysics Seminar: Sunyaev-Zeldovich Signals from L* Galaxies: Observations, Analytics, and Simulations
Yossi Oren, TAU
Zoom: https://tau-ac-il.zoom.us/j/87230679135?pwd=Y1duRlArUkJwSnhaaXVscUU0azY3Zz09
Abstract:
We analyze measurements of the thermal Sunyaev-Zeldovich (tSZ) effect arising in the circumgalactic medium (CGM) of L* galaxies. In our analysis we use the Faerman et al. 2017 and Faerman et al. 2020 CGM models, a new power-law model (PLM), and the TNG100 simulation.
An observation by Bregman et al. 2022 Compton-y profile implies steep electron pressure slopes (a_Pth = 2.03). Considering the possibility of a hydrostatic equilibrium, we find that the B+22 galaxies favor an isentropic equation of state over an isothermal one. The B+22 results are consistent with a similar work by Das et al. 2022, and with recent (0.5-2 keV) CGM X-ray observations by Zhang et al. 2024 of Milky Way mass systems.
TNG100 underpredicts the tSZ parameters by relatively 0.5 dex for the L* galaxies, suggesting that the feedback strengths and CGM gas losses are overestimated in the simulated halos at these mass scales.
Seminar Organizer: Dr. Jonathan Stern
