[Astronomy seminar] Astronomy seminar this Friday

[Astronomy seminar announcements]

Reminder!



On 9/6/17 16:22, Matthew Hayes wrote:
> All,
> 
> The next Astronomy seminar will be:
> 
> *** Friday 8 of Sept from 10:30 to 11:30 at FC61 ***
> 
> Welcome.
> 
> 
> Title:  The circumgalactic gas and metals around star forming and 
> elliptical galaxies
> 
> Speaker: Sijing Shen, Institute of Theoretical Astrophysics, Oslo
> 
> Abstract:
> 
> Understanding the baryon cycle in galaxies, i.e., how gas is accreted 
> onto galaxies, consumed in star formation, and ejected back to the 
> environment is crucial to understand galaxy formation and evolution. 
> Studies of the distribution, kinematics and evolution of the gas and 
> metals in the circumgalactic medium (CGM) provide clues to understanding 
> this baryon cycle.  In this talk, I will briefly review recent progress 
> on observational and theoretical studies on the CGM. I will then present 
> new results on the circumgalactic gas and metals around massive 
> star-forming and elliptical galaxies at z~3-0 from two suites of 
> “zoom-in” cosmological hydrodynamic simulations, and detailed 
> comparisons with observed Lyman alpha (Lya) and metal absorption data 
> (e.g. Mg II, Si II, Si III, C II, C III, CIV and OVI) in particular from 
> the COS-Halos Survey. We found that simulations generally reproduce the 
> distributions of of neutron hydrogen and high-ionisation metal ions 
> (such as O VI), but significantly underestimate the low-ionisation metal 
> species. I will explore possible reasons for the mis-match and discuss 
> the correlation between the cold, enriched gas probed by the low ions 
> and the warm-hot gas probed by O VI. I will also discuss the impact of 
> feedback from supernova and the active galactic nuclei (AGN).

-- 
Matthew Hayes
Wallenberg Academy Fellow          email: matthew at astro.su.se
Stockholm University                 tel: +46 (0)8 5537 8521
Department of Astronomy & OKC        fax: +46 (0)8 5537 8510
AlbaNova University Centre          inst: www.astro.su.se
SE-106 91 Stockholm             personal: www.xayes.org/pub/
Sweden                             skype: matthewhayes