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We used multiwavelength data (HI, FUV, NUV, R) to search for evidence of starformation in the intragroup medium of the Hickson Compact Group 100. We findthat young star-forming regions are located in the intergalactic HI clouds ofthe compact group which extend to over 130 kpc away from the main galaxies. Atidal dwarf galaxy candidate is located in the densest region of the HI tail,61 kpc from the brightest group member and its age is estimated to be only 3.3Myr. Fifteen other intragroup HII regions and TDG candidates are detected inthe GALEX FUV image and within a field 10'x10' encompassing the HI tail. Theyhave ages <200 Myr, HI masses of 10^(9.2-10.4) Msun, 0.001< SFR <0.01 Msunyr^-1, and stellar masses 10^4.3--10^6.5 Msun. The HI clouds to which many ofthem are associated have column densities about one order of magnitude lowerthan N(HI)~10^21 cm^-2.

Searching for Star Formation Outside Galaxies: Multiwavelength Analysis of the Intragroup Medium of HCG100