Spitzer Observations of Tidal Dwarf Galaxies
Sarah J. U. Higdon, James L. Higdon
TL;DR
This paper reports Spitzer infrared observations of Tidal Dwarf Galaxies in three systems, revealing star formation indicators such as PAH emissions and warm molecular hydrogen, with distinctive IRAC colors.
Contribution
It provides the first detailed infrared spectral analysis of TDGs, highlighting their star formation activity and PAH properties.
Findings
Detection of bright PAH emission indicating active star formation
TDGs exhibit extremely red IRAC colors due to PAH emission
PAH emission characterized by neutral 100-C PAH molecules
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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