This Week

Week Commencing 24 September 2018

ASR Management Group

Tuesday 25 September, 1pm, Physics West 229

ASR Group Meeting

Wednesday 26 September 2018, 12 noon Physics West Library

Astrophysics & Space Research Group and HiROS Group Seminar

Wednesday 26 September 2018, 1.30pm Physics West Lecture Theatre 117
NOTE THE CHANGE OF TIME
Speaker: Dr Fiorenzo Vincenzo, Hertfordshire

Title: Galactic astroarchaeology with cosmological chemodynamical simulations.

The chemical composition of the interstellar medium of galaxies continuously
evolves as a function of time because of many environmental physical processes.
Restitution of metals from dying stars, astration of metals due to the star
formation activity, gas inflows and outflows, radial mixing of both gas and
stars are all fundamental mechanisms which drive the chemical evolution of
galaxies. Starting from the observed present-day chemical abundances in the
stars and interstellar medium, chemical evolution models aim at reconstructing
the past chemical enrichment history of galaxies, in a typical
“astro-archaeological” approach. 

In the first part of the talk, I will introduce the basic concepts behind
chemical evolution models and present my original contribution in the
foundations of this field. In the second part, I will show how cosmological
hydrodynamical simulations can be effectively used to study the evolution of
the radial (gas-phase and stellar) C, N and O chemical abundance gradients in
galaxies, presenting also new results from high-resolution zoom-in simulations,
where a target galaxy is selected at low redshift from a reference large-scale
cosmological simulation and then re-simulated with a larger number of
resolution elements, starting from the initial conditions of the early
Universe. Finally, I will present some preliminary results from the
chemodynamical simulation of a Milky Way-like galaxy, that we have developed
to characterise the different chemical evolution histories of the thin and
thin disc stellar components of our Galaxy.

Visitors

Monday 24 September 2018

Floor Broekgaarden from the Netherlands will be visiting the COMPAS group for
a month arriving Monday 24 September 2018.

New Staff

The group has welcomed the following new staff.

Dr Tyrone Woods and Dr Leonid Prokhorov, who will be based in office 219
and Dr Antoine Klein who will be in office 237.

Publications

Vigna-Gómez et al.
On the formation history of Galactic double neutron stars MNRAS, accepted
 https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/sty2463/5092622?guestAccessKey=f735cde2-8df0-4b6a-b38b-47d390dbfb04

Extracting distribution parameters from multiple uncertain observations with
selection biases
Ilya Mandel, Will M. Farr, Jonathan R. Gair
http://arxiv.org/abs/1809.02063

Comment on “An excess of massive stars in the local 30 Doradus starburst”
Will Farr, Ilya Mandel
Science 361, 6400
http://science.sciencemag.org/content/361/6400/eaat6506

The optical afterglow of the short gamma-ray burst associated with GW170817 published in Nature Astronomy:
Lyman, Lamb, Levan, Mandel, Tanvir et al.
https://www.nature.com/articles/s41550-018-0511-3

Archive

Previous issues can be found here