Valérie de Lapparent

Permanent senior researcher

IAP homepageInstitut
de Paris
CNRS homepage UPMC homepage

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  • Mail : lapparen @ iap . fr
  • Tel. : (33) 1 44 32 81 37
  • Fax : (33) 1 44 32 00 01
98 bis Boulevard Arago
75014 Paris


Valérie de Lapparent is an astronomer at the Institut d'Astrophysique de Paris, a joint laboratory of CNRS and the Université Pierre et Marie Curie. She is expert in the study of galaxies and their distribution at large scales. She received in 1988 the CNRS bronze medal for her role in the discovery of the "cell-like" structure of the galaxy distribution. These results led to a considerable renewal of interest in the mapping of the large-scale structure of the Universe and in the theoretical and numerical simulations of galaxy and structure formation.
The research performed by Valérie de Lapparent is based on the observation of distant galaxies which she makes using the large telescopes at european and french-american facilities (ESO in Chile, TCFH in Hawaii), and analyzes at the Institut d'Astrophysique de Paris. She also makes use of the observations extracted from the large community surveys acquired in service mode (CFHTLS, SDSS). The exploration of these data allows her to characterize galaxies by their luminosity, morphology, size, and spectral properties. She can then examine how the different galaxy populations brought to light are clustered and evolve within the dark matter halos and at large scales. This information is critical for testing and specifying the models describing the evolution of galaxies and large-scale structures.

Research areas

  • Observational cosmology
  • Large-scale structure of the Universe
  • Galaxy evolution

Current research subjects

  • Clustering of galaxies at large scale and contraints on the dark matter halos
  • Morphometry of galaxies and relationship with their spectral properties and environment
  • Evolution of the morphological and spectral characteristics of galaxies

Reporting Gabrielle Vendryes and Julien Prieur [6 mn]
CNRS-Ecole Supérieure des Métiers de l'Image, du Son et du Multimedia (2010)


  • Optical and infrared observations of distant galaxies
  • Imaging and multi-slit spectroscopy of faint galaxies
  • Mapping the 3D distribution of galaxies
  • Mesuring the collective properties of galaxies (luminosity fonctions, clustering)
  • Determination of the shape parameters of galaxies (morphometry)
  • Modelling galaxy number-counts from the spectral energy distributions

Other activities

Current programmes

Recent work

Previous work



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Last update: 2009/03/10