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We present a multi-wavelength study of a newly discovered compact group (CG),SDSS J0959+1259, based data from XMM-Newton, SDSS and the Calar Alto opticalimager BUSCA. With a maximum velocity offset of 500 km s$^{-1}$, a meanredshift of 0.035, and a mean spatial extension of 480 kpc, this CG isexceptional in having the highest concentration of nuclear activity in thelocal Universe, established with a sensitivity limit L$_{X}>4\times $10$^{40}$erg s$^{-1}$ in 2--10 keV band and R-band magnitude $M_R < -19$. The group iscomposed of two type-2 Seyferts, one type-1 Seyfert, two LINERs and three starforming galaxies. Given the high X-ray luminosity of LINERs which reaches $\sim10^{41}$ erg s$^{-1}$, it is likely that they are also accretion driven,bringing the number of active nuclei in this group to to 5 out of 8 (AGNfraction of 60\%). The distorted shape of one member of the CG suggests thatstrong interactions are taking place among its galaxies through tidal forces.Therefore, this system represents a case study for physical mechanisms thattrigger nuclear activity and star formation in CGs.

Multiple AGN in the crowded field of the compact group SDSSJ0959+1259