Colloquia Schedule Fall 2013
Colloquia are on Tuesdays (unless otherwise indicated) at 3:30 pm in RLM 15.216B
Dust in the Early Universe
In the last few years mm and submm observations of high redshift quasars
and galaxies have provided a powerful way of probing the very existence
and properties of dust within 1 Gyr of the Big Bang. It is generally believed
that at these cosmic times dust could have only condensed in the explosive
ejecta of supernovae since intermediate-to-low mass stars did not
have time to evolve off the main sequence into the dust-condensation stage.
To account for the dust masses observed at z > 6, about 1 Msun of dust per
supernova needs to be produced, in agreement with the condensation efficiencies
predicted by supernova dust nucleation models. However, the largest dust masses
measured so far in supernova ejecta are about two orders of magnitude smaller.
Conversely, indications for supernova dust beyond z ~ 6 have recently come from
observations of dust reddening of the host galaxies of a z = 6.2 quasars and
z = 6.3 gamma-ray burst.
In this talk, we will review the recent advancements made in this controversial
subject. We will present the results of recent models for dust production in supernova
ejecta and intermediate mass stars and its subsequent evolution in the interstellar
medium of high redshift galaxies. We will also discuss the implications of an
early epoch of dust formation for the cosmic transition between Population III
and Population II stars.
INAF/Osservatorio Astronomico di Roma
host: Volker Bromm
Visitors to the Department of Astronomy can find detailed information and maps on our
Visiting Austin Page.
Please report omissions/corrections to: G. Orris at firstname.lastname@example.org.