Le 24 avril 2018
De 12h45 à 13h45

Anu Kundu (ObAS)  Understanding pulsar emission considering a rotating off-centred...

Du 18 juin 2018 au 22 juin 2018
Strasbourg, France

"The co-evolution of galaxies and the intergalactic medium during the first billion years of the...

Accueil   >   Recherche   >   Séminaires et réunions   >   Séminaires internes : The impact of energetic phenomena on evolving galaxies — what can we learn from cosmological simulations?

The impact of energetic phenomena on evolving galaxies — what can we learn from cosmological simulations?

Le 15 décembre 2017
De 10h30 à 12h00

Michaela Hirschmann



I give a review over the success and limitations of models for stellar and AGN feedback adopted in modern cosmological simulations, highlighting the need for feedback to predict realistic galaxy and black hole (BH) populations over cosmic time. Feedback from stars and AGN has been, for example, repeatedly shown to strongly regulate star formation and BH accretion in low-mass and massive galaxies, respectively, and to be necessary to capture the observed anti-hierarchical trend in galaxy/BH growth. Employing advanced, high-resolution cosmological zoom-in simulations indicates a more complex interplay between different feedback processes and the evolution of galaxies, and their baryon cycles, than traditionally anticipated. Specifically, I present new results, how feedback processes can affect chemical enrichment and the re-distribution of gas and metals in the interstellar and circum-galactic medium of galaxies, and to what extent feedback mechanisms are imprinted in corresponding direct spectral observables, such as nebular emission and absorption lines. Comparisons to modern observational data (mass-metallicity relation, metallicity gradients, nebular emission/absorption lines) put strong constraints on outflow mechanisms and thus, can help to differentiate between still uncertain, and partly degenerate, models for stellar and AGN feedback. Perspectives for future improvements will be given.

Search & Find
févr. 23 2018

 The nature of the massive Be star with strong and hard X-ray emission, gamma  Cassiopae, remains...

avril 6 2018

  Deux chercheurs de l'Observatoire astronomique viennent de se voir décerner une distinction...

mars 26 2018

Pour la première fois, une équipe de l’Observatoire Astronomique de Strasbourg vient de prédire...