Morphology and color of EAGLE galaxy population

David Caro building, Level 7 conference room

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Yuxiang Qin

  • Dr Camila Correa
    Dr Camila Correa, Postdoctoral fellow
    Leiden University

    Email: cami.acorrea[at]gmail.com

Abstract

I investigate the dependence of kinematic-based galaxy morphology on intrinsic u-r colours and stellar mass in the EAGLE cosmological hyDrodynamical simulations. I use the intrinsic colours and measured the fraction of kinetic energy invested in ordered rotation of 3562 galaxies at z=0 with stellar masses larger than 10^10 solar masses. I find that EAGLE produces a galaxy population whose morphology correlates with the colour bimodality for central and satellite galaxies alike. The red-sequence is mostly populated elliptical-type galaxies and most of blue-cloud galaxies are disc-type. I analyse gri-composite images of orderly rotating galaxies and show that many resolve a disc structure and spiral arms. These results show that the connection between mass, intrinsic colour and morphology arise naturally from galaxy formation models able to reproduce observed star formation relations and galaxy abundance distributions. In this talk I will discuss these findings, and use galaxy morphology (that holds clue to past merger history) and the galaxy distribution on the color-mass diagram to disentangle different evolutionary paths. In particular I will focus on the origin of red-sequence galaxies.

Morphology and color of EAGLE galaxy population