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Spatially resolved imaging at 350 µm of cold dust in nearby elliptical galaxies

Show simple item record Leeuw, Lerothodi L. Davidson, Jacqueline Dowell, C. Darren Matthews, Henry E. 2008-09-04T18:02:48Z 2008-09-04T18:02:48Z 2008-04-10
dc.identifier.citation The Astrophysical Journal, 677:249-261, 2008 April 10 en_US
dc.identifier.clearanceno 08-0339
dc.description.abstract Continuum observations at 350 µm of seven nearby elliptical galaxies for which CO gas disks have recently been resolved with interferometry mapping are presented. These SHARC II mapping results provide the first clearly resolved far-infrared (FIR)-to-submillimeter continuum emission from cold dust (with temperatures 31 K≥T ≥23 K) of any elliptical galaxy at a distance >40 Mpc. The measured FIR excess shows that the most likely and dominant heating source of this dust is not dilute stellar radiation or cooling flows, but rather star formation that could have been triggered by an accretion or merger event and fueled by dust-rich material that has settled in a dense region cospatial with the central CO gas disks. The dust is detected even in two cluster ellipticals that are deficient in H i, showing that, unlike H i, cold dust and CO in ellipticals can survive in the presence of hot X-ray gas, even in galaxy clusters. No dust cooler than 20 K, either distributed outside the CO disks or cospatial with and heated by the entire dilute stellar optical galaxy (or very extended H i), is currently evident. en_US
dc.description.sponsorship NASA/JPL en_US
dc.publisher The American Astronomical Society en_US
dc.subject photometry en_US
dc.subject radio continuum en_US
dc.subject submillimeter en_US
dc.subject elliptical and lenticular glaxies en_US
dc.title Spatially resolved imaging at 350 µm of cold dust in nearby elliptical galaxies en_US
dc.type Article en_US

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