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We describe X-ray observations with Chandra and XMM-Newton of 18 galaxygroups (M_group ~ 1-6x10^13 Msolar, z~0.05) from the Zurich Environmental Study(ZENS). We aim to establish the frequency and properties, unaffected by hostgalaxy dilution and obscuration, of AGNs in central and satellite galaxymembers, also as a function of halo-centric distance. X-ray point-sourcedetections are reported for 22 of 177 observed galaxies, down to a limit off_(0.5-8 keV) ~ 5x10^-15 erg cm^-2 s^-1, corresponding to a limiting luminosityof L_(0.5-8 keV)~3x10^40 erg s^-1. With the majority of the X-ray sourcesattributed to AGNs of low-to-moderate levels (L/L_Edd>~10^-4), we discuss thedetection rate in the context of the occupation of AGNs to halos of this massscale and redshift, and compare the structural/morphological properties betweenAGN-active and non-active galaxies of different rank and location within thegroup halos. We see a slight tendency for AGN hosts to have either relativelybrighter/denser disks (or relatively fainter/diffuse bulges) than non-activegalaxies of similar mass. At galaxy mass scales <10^11 Msolar, central galaxiesappear to be a factor ~4 more likely to host AGNs than satellite galaxies ofsimilar mass. This effect, coupled with the tendency for AGNs to reside inmassive galaxies, explains the (weak) trend for AGNs to be preferentially foundin the inner regions of groups, with no detectable trend with halo-centricdistance in the frequency of AGNs within the satellite population. Finally, ourdata support other analyses in finding that the rate of decline with redshiftof AGN activity in groups matches that of the global AGN population, indicatingthat either AGNs occur preferentially in groups, or that the evolution rate isindependent of halo mass. These trends are of potential importance, and requireX-ray coverage of a larger sample to be solidly confirmed.

The X-ray Zurich Environmental Study (X-ZENS). I. Chandra and XMM-Newton observations of AGNs in galaxies in nearby groups