[Okc-wp4] Seminar on 10 September, 1300

[Felix Ryde]

Mette Friis, University of Iceland, will give a seminar on 10 September at 1300 in the KTH meeting room.

Title: The occurrence of grey dust in the Universe

Abstract: A correct understanding of dust extinction and attenuation is crucial to the progress in any field in cosmology and astrophysics that relies on accurate luminosity determinations. Extinction correction poses a challenge outside the local universe, where dust properties are not easily studied.  Grey dust has now been observed in several gamma-ray burst host galaxies. I will go through these results, and show how standard dust-correction methods at high redshifts may be inaccurate and lead to the wrong conclusions. I will highlight this point with the global star-formation history of the Universe, showing how it may change depending on the amount of grey dust at different redshifts.

Mette Friis is a candidate for a postdoc position at KTH.

Mark & Felix
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