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Spitzer Observations of Tidal Dwarf Galaxies

Authors
  • Higdon, Sarah J. U.
  • Higdon, James L.
Type
Preprint
Publication Date
Sep 10, 2007
Submission Date
Sep 10, 2007
Identifiers
DOI: 10.1017/S1743921307014251
Source
arXiv
License
Unknown
External links

Abstract

We present Spitzer observations of Tidal Dwarf Galaxies (TDGs) in three interacting systems: NGC 5291, Arp105 and 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 micron 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.

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