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Spitzer Observations of Tidal Dwarf Galaxies

Published online by Cambridge University Press:  01 June 2007

Sarah J. U. Higdon  and
James L. Higdon
Sarah J. U. Higdon
Affiliation:
Physics Department, Georgia Southern University, Statesboro, GA 30460 Astronomy Department, Cornell University, Ithaca, NY 14853 email: [email protected]
James L. Higdon
Affiliation:
Physics Department, Georgia Southern University, Statesboro, GA 30460
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Abstract

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We present Spitzer observations of Tidal Dwarf Galaxies (TDGs) in three interacting systems: NGC 5291, Arp 105 & Stephan's Quintet. The spectra show bright emission from polyaromatic hydrocarbons (PAHs), nebular lines and warm molecular hydrogen, characteristic of recent episodes of star formation. The PAH emission that falls in the IRAC 8.0 μm band leads to the TDGs having an extremely red IRAC color, with [4.5] − [8.0] > 3. The emission from PAHs is characterized by a model with mainly neutral 100-C PAH atoms.

Keywords

galaxies: dwarfgalaxies: evolutiongalaxies: formationinfrared: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 356 - 357
Copyright
Copyright © International Astronomical Union 2008

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