Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-28
Astronomy and Astrophysics
Astrophysics
13 pages, 5 figures. To appear in the proceedings of the conference "Penetrating Bars through Masks of Cosmic Dust: The Hubble
Scientific paper
In recent years it became clear that a population of galaxies radiating most of their power in the far-infrared contribute an important part of the whole star formation activity in the universe. These galaxies emit up to 99% of their energy output in the infrared by dust. The optical properties of dust in galaxies are thus very important to understand this population. Mayo Greenberg who has brought many of the ideas underlying our understanding of the physics of interstellar dust has been a pioneer in predicting the important role of organic solid material formed on dust grains in molecular clouds and of potential importance of transient heating of very small particles. It appeared with the ISO data on galaxies and even more today with the first Spitzer data that these mechanisms are important globally for the observations of infrared galaxies at significant redshifts. The understanding of their evolution is one of the keys to the understanding of galaxy built up and evolution.
Dole Herve
Lagache Guilaine
Puget Jean-Loup
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