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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
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

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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2011

References

Brook, C., Richard, S., Kawata, D., Martel, H., & Gibson, B. K. 2007, ApJ, 658, 60CrossRefGoogle Scholar
Kawata, D. & Gibson, B. K. 2003a, MNRAS, 340, 908CrossRefGoogle Scholar
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Naab, T. & Burkert, A. 2003, ApJ, 597, 893CrossRefGoogle Scholar
Richard, S., Brook, C. B., Martel, H., Kawata, D., Gibson, B. K., & Sánchez-Blásquez, P. 2010, MNRAS, 402, 1489CrossRefGoogle Scholar
Toomre, A., 1977, in Evolution of Galaxies and Stellar Populations, eds. Tinsley, B. M. & Larson, R. B., (New Haven: Yale University Observatory), p. 401Google Scholar

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