Massive warm/hot galaxy coronae. ii. isentropic model

Yakov Faerman*, Amiel Sternberg, Christopher F. Mckee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We construct a new analytic phenomenological model for the extended circumgalactic material (CGM) of L∗ galaxies. Our model reproduces the O vii/O viii absorption observations of the Milky Way (MW) and the O vi measurements reported by the COS-Halos and eCGM surveys. The warm/hot gas is in hydrostatic equilibrium in an MW gravitational potential, and we adopt a barotropic equation of state, resulting in a temperature variation as a function of radius. A pressure component with an adiabatic index of is included to approximate the effects of a magnetic field and cosmic rays. We introduce a metallicity gradient motivated by the enrichment of the inner CGM by the Galaxy. We then present our fiducial model for the corona, tuned to reproduce the observed O vi-O viii column densities and with a total mass ofat large radii is. We present predictions for a wide range of future observations of the warm/hot CGM, from UV/X-ray absorption and emission spectroscopy to dispersion measure and Sunyaev-Zel'dovich cosmic microwave background measurements. We provide the model outputs in machine-readable data files for easy comparison and analysis.

Original languageEnglish
Article number82
JournalAstrophysical Journal
Volume893
Issue number1
DOIs
StatePublished - 10 Apr 2020

Funding

FundersFunder number
Israeli Centers for Research Excellence1829/12

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