Astronomy & Astrophysics

Table 1: Spectroscopic data for the galaxies in the NEP cluster RX J1821.6+6827.
Table 2: X-ray properties of RX J1821.6+6827 (NEP 5281) and RX J1821.9+6818 (NEP 5330).
Table 3: Fluxes and luminosities for the galaxy cluster and the QSO.