Файл:Bird 314 medres.pngCold streams from the cosmic web feeding a galaxy in the early universe, based on a hydro-cosmological computer simulation (Dekel et al., 2011) The picture shows gas density, extending to a half a million light years, when the Universe was 3 billion years old.Файл:Dekel photograph.pngViolent gravitational Instability in a disk galaxy in the early universe, based on a hydro-cosmological computer simulation (Dekel et al., 2011) The picture of gas density shows that the disk is fragmented to giant clumps where stars form. The disk radius is 30,000 light years.
Dekel earned his Ph.D. from the Hebrew University in 1980, and was a research fellow at Caltech and assistant professor at Yale University before joining the faculty of the Hebrew University in 1986.
He served as the Head of The Racah Institute of Physics (1997–2001), the Dean of the Authority for the Community and Youth at the Hebrew University (2005–2011), and the President of the Israel Physical Society (2008–11). He headed the university computing committee, was a member of the executive committee of the board of trustees and a member of the standing committee of the Hebrew University.
Dekel was awarded a Visiting Miller Professorship[1] at UC Berkeley, a Blaise Pascal International Chair of Research by the École Normale Supérieure in Paris (2004–06), and a Lagrange fellowship in IAP Paris (2015–16). He has been elected as a fellow of the Israel Physical Society (2019), and has been awarded the Landau Prize for Arts and Sciences (2020).
Dekel is known for his contributions to research in cosmology, especially the study of the formation of galaxies and large-scale structure in the Universe, which is dominated by dark energy and dark matter.
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His expertise is dwarf galaxies and supernova feedback (1986, 2003), large-scale cosmic flows and early estimates of fundamental cosmological parameters (1989-2001),
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the structure of dark-matter galactic halos (2000–2003), and the theory of galaxy formation (2003–2012).
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His research focuses on galaxy formation in its most active phase at the early universe, using analytic models and computer simulations. He studies how continuous streams of cold gas and merging galaxies from the cosmic web lead to star-forming disks and drive violent gravitational disk instability, and how this instability leads to the formation of compact spheroidal galactic components with central massive black holes.
Dekel is the most highly cited astrophysicist in Israel, with 45,000 citations and H-index 106.
