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A spectroscopic analysis of 10 intergalactic star forming objects (ISFOs) anda photometric analysis of 67 ISFOs in a sample of 14 interacting systems ispresented. The majority of the ISFOs have relative polycyclic aromatichydrocarbon (PAH) band strengths similar to those of nearby spiral andstarburst galaxies. In contrast to what is observed in blue compact dwarfs(BCDs) and local giant HII regions in the Milky Way (NGC 3603) and theMagellanic Clouds (30 Doradus and N 66), the relative PAH band strengths inISFOs correspond to models with a significant PAH ion fraction (<50%) andbright emission from large PAHs (~100 carbon atoms). The [NeIII]/[NeII] and[SIV]/[SIII] line flux ratios indicate moderate levels of excitation with aninterstellar radiation field that is harder than the majority of the SpitzerInfrared Nearby Galaxies Survey and starburst galaxies, but softer than BCDsand local giant HII regions. The ISFO neon line flux ratios are consistent witha burst of star formation < 6 million years ago. Most of the ISFOs have~million solar masses of warm molecular hydrogen with a likely origin inphoto-dissociation regions (PDRs). Infrared Array Camera photometry shows theISFOs to be bright at 8 um, with one third having [4.5] - [8.0] > 3.7, i.e.,enhanced non-stellar emission, most likely due to PAHs, relative to normalspirals, dwarf irregulars and BCD galaxies. The relative strength of the 8 umemission compared to that at 3.6 um or 24 um separates ISFOs from dwarfgalaxies in Spitzer two color diagrams. The infrared power in two thirds of theISFOs is dominated by emission from grains in a diffuse interstellar medium.One in six ISFOs have significant emission from PDRs, contributing ~30 % - 60 %of the total power. ISFOs are young knots of intense star formation.

astrophysical journal/the astrophysical journal

Star Formation and the Interstellar Medium In Nearby Tidal Streams  (SAINTS): Spitzer Mid-infrared Spectroscopy and Imaging of Intergalactic  Star-forming Objects