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Understanding the transformation of spirals to lenticulars

Published online by Cambridge University Press:  09 February 2015

Evelyn J. Johnston ,
Alfonso Aragón-Salamanca  and
Michael R. Merrifield
Evelyn J. Johnston
Affiliation:
School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK email: ejohnsto@eso.org
Alfonso Aragón-Salamanca
Affiliation:
School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK email: ejohnsto@eso.org
Michael R. Merrifield
Affiliation:
School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK email: ejohnsto@eso.org
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Abstract

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By studying the individual star-formation histories of the bulges and discs of lenticular (S0) galaxies, it is possible to build up a sequence of events that leads to the cessation of star formation and the consequent transformation from the progenitor spiral. In order to separate the bulge and disc stellar populations, we spectroscopically decomposed long-slit spectra of Virgo Cluster S0s into bulge and disc components. Analysis of the decomposed spectra shows that the most recent star formation activity in these galaxies occurred within the bulge regions, having been fuelled by residual gas from the disc. These results point towards a scenario where the star formation in the discs of spiral galaxies are quenched, followed by a final episode of star formation in the central regions from the gas that has been funnelled inwards through the disc.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 225 - 226
Copyright
Copyright © International Astronomical Union 2015 

References

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Johnston, E. J., Aragón-Salamanca, A., Merrifield, M. R., & Bedregal, A. G. 2012, MNRAS, 422, 2590CrossRefGoogle Scholar