Near UV Properties of Early–Type Galaxies at z ~ 1

  • Sperello di Serego Alighieri
  • Alessandro Bressan
Conference paper
Part of the Astrophysics and Space Science Proceedings book series (ASSSP)


We have used spectral fits to SSP–based atmosphere models to derive an estimate of the average stellar age for an almost complete sample of 15 Early-Type Galaxies (ETG) at 0.88<z<1.3. The results are in only partial agreement with the age estimates previously obtained for the same objects from an analysis of the M/L B ratio, derived from the Fundamental Plane (FP) parameters. In particular spectral fits seem to underestimate the age of the most luminous ETG, and therefore do not reproduce the downsizing effect, which is clear for the FP ages. We also analyse the relationship between the spectral–fit ages and various near–UV spectral indices.


Spectral Index Stellar Population Galaxy Evolution Galaxy Mass Type Galaxy 
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Copyright information

© Springer-Verlag New York 2009

Authors and Affiliations

  • Sperello di Serego Alighieri
    • 1
  • Alessandro Bressan
    • 2
  1. 1.INAF – Osservatorio Astrofisico di ArcetriItaly
  2. 2.INAF – Osservatorio Astronomico di PadovaItaly

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