Paul Martini (The Ohio State University)
"The Mystery of Dust in Early-Type Galaxies"
Abstract. Approximately half of all early-type galaxies are observed to have dust, yet the origin of this dust remains a mystery. Two origins have been proposed to explain the dust: creation in the stellar winds of their evolved stellar populations and the accretion of dusty satellites, yet neither appears to be completely successful. In order to resolve this issue, I have fit dust models and estimated dust masses (or established upper limits) for a representative sample of early-type galaxies with mid- to far-IR photometry. I will present a demographic analysis of the dust mass distribution in these galaxies and combine estimates of the expected rate of internal production, the rate of dusty satellite accretion, and the dust destruction timescale to explain the origin of the dust.
Held in the AAO Meeting Room (Room 7, 1st Floor, Building 2) at 11:00 AM on Thursday, 26 September 2013back