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Gas and Dust in Ultraluminous Infrared Galaxies: Implications for Sources at High Redshift

Published online by Cambridge University Press:  30 March 2016

D. Downes
D. Downes*
Affiliation:
Institut de Radio Astronomie Millimétrique, Grenoble, France

Abstract

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High-z mm and submm dust sources are thought to be similar to ultraluminous infrared galaxies, where merger interactions have driven most of the gas and dust into circumnuclear molecular disks or rings with typical radii of 500 pc. Within these disks, CO and radio data indicate a new class of extreme starbursts, with characteristic sizes of 100 pc, gas masses of 109 M⊙ and IR luminosities of ∼ 3 × 1011L⊙ from OB stars. Some of these regions, however, harbor powerful AGNs, even though the optical IR diagnostics may classify them as starbursts. Trentham (2000) argues that averaged over time, most of the high-z dust sources must be powered by AGNs.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 12: Highlights of Astronomy. As presented at the XXIVth General Assembly of the IAU, 2000 , 2002 , pp. 477 - 480
Copyright
Copyright © Astronomical Society of Pacific 2002

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