Formation of S0 galaxies through mergers: explaining angular momentum and concentration change from spirals to S0s

M. Querejeta, M.C. Eliche-Moral, T. Tapia, A. Borlaff, G. Van De Ven, M. Lyubenova, M. Martig, J. Falcón-Barroso, Jairo Mendez Abreu

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54 Citations (Scopus)
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Abstract

The CALIFA team has recently found that the stellar angular momentum and concentration of late-type spiral galaxies are incompatible with those of lenticular galaxies (S0s), concluding that fading alone cannot satisfactorily explain the evolution from spirals into S0s. Here we explore whether major mergers can provide an alternative way to transform spirals into S0s by analysing the spiral-spiral major mergers from the GalMer database that lead to realistic, relaxed S0-like galaxies. We find that the change in stellar angular momentum and concentration can explain the differences in the λRe-R90/R50 plane found by the CALIFA team. Major mergers thus offer a feasible explanation for the transformation of spirals into S0s.
Original languageEnglish
Article numberL2
Number of pages6
JournalAstronomy & Astrophysics
Volume579
Early online date19 Jun 2015
DOIs
Publication statusPublished - Jul 2015

Keywords

  • Galaxies: interactions
  • Galaxies: evolution
  • Galaxies: kinematics and dynamics
  • Galaxies: elliptical and lenticular, cD

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