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DGCE SIG Seminar

Diffuse Gas in Cosmic Ecosystems Science Interest Group

DATE

Nov 30, 2023

TIME

4:00 pm EST

COMMUNITY

DGCE SIG

TYPE

Seminar

Dust – the Other Side of 'Diffuse'

Daniela Calzetti, University of Massachusetts, Amherst

Dust represents about 1% of the ISM by mass in galaxies, yet it has a disproportionate impact on their physics and appearance. I will briefly discuss measurements of dust and dust effects in galaxies at different redshifts, and highlight what we understand and where the challenges and unknowns currently are.

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An illustration of Sun-like star HD 181327 and its surrounding debris disk. The star is at top right. It is surrounded by a far larger debris disk that forms an incomplete ellpitical path and is cut off at right. There’s a huge cavity between the star and the disk. The debris disk is shown in shades of light gray. Toward the top and left, there are finer, more discrete points in a range of sizes. The disk appears hazier and smokier at the bottom. The star is bright white at center, with a hazy blue region around it. The background of space is black. The label Artist's Concept appears at lower left.