The Temperature and Turbulence of Circumgalactic C IV Absorbers at z ∼ 0.07
Abstract
Understanding gas flows in the circumgalactic medium (CGM) around galaxies is an important aspect of galaxy formation and evolution over cosmic time. In particular, the thermal and dynamical properties of the CGM will constrain the feedback mechanisms and outflow properties of these galaxies driven by supernovae and/or OB stars. In this work, we use ~150 COS AGN archival spectra to obtain new measurements of the temperature and turbulence of the CGM, derived from HI+C IV pairs at z~0.07. We combine our results with measurements made using the same observables at higher redshifts around z~2.5, constraining the thermal/dynamical evolution of the CGM. Our preliminary results suggest that the CGM temperature probed by HI+C IV pairs does not change within errors, but the non-thermal motion increases by a factor of ~2.5 at z~0.07.
- Publication:
-
American Astronomical Society Meeting Abstracts #233
- Pub Date:
- January 2019
- Bibcode:
- 2019AAS...23335502M