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Chemical Signature of Gas-rich disc-disc Mergers at high Redshift

Published online by Cambridge University Press:  05 December 2011

Hugo Martel ,
Simon Richard ,
Chris B. Brook ,
Daisuke Kawata ,
Brad K. Gibson  and
Patricia Sánchez-Blázquez
Hugo Martel
Affiliation:
Département de physique, de génie physique et d'optique, Université Laval, Québec, QC, G1K 7P4, Canada Centre de Recherche en Astrophysique du Québec
Simon Richard
Affiliation:
Département de physique, de génie physique et d'optique, Université Laval, Québec, QC, G1K 7P4, Canada Centre de Recherche en Astrophysique du Québec
Chris B. Brook
Affiliation:
Jeremiah Horrocks Institute for Astrophysics and Supercomputing, University of Central Lancashire, Preston PR1 2HE, England
Daisuke Kawata
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking RH5 6NT, England
Brad K. Gibson
Affiliation:
Jeremiah Horrocks Institute for Astrophysics and Supercomputing, University of Central Lancashire, Preston PR1 2HE, England
Patricia Sánchez-Blázquez
Affiliation:
Instituto de Astrofí sica de Canarias, E-38200 La Laguna, Tenerife, Spain Departamento de Astrofí sica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain Departamento de Fí sica Teórica, Módulo C15, Universidad Autónoma de Madrid, E28049 Cantoblanco, Spain
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Abstract

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We performed numerical simulations of mergers between gas-rich disc galaxies, which result in the formation of late-type galaxies. Stars formed during the merger end up in a thick disc that is partially supported by velocity dispersion and has high [α/Fe] ratios at all metallicities. Stars formed later end up in a thin, rotationally supported disc which has lower [α/Fe] ratios. While the structural and kinematical properties of the merger remnants depend strongly upon the orbital parameters of the mergers, we find a clear chemical signature of gas-rich mergers.

Keywords

galaxies: evolutiongalaxies: formationgalaxies: interactionsgalaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S277: Tracing the Ancestry of Galaxies (on the land of our ancestors) , December 2010 , pp. 250 - 254
Copyright
Copyright © International Astronomical Union 2011

References

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