We present redshifts for a sample of 228 clusters selected from the APM Galaxy Survey, 188 of which are new redshift determinations. Redshifts are listed for 365 galaxies, and...
The origin of diffuse radio sources, socalled cluster radio halos and relics isstill shrouded in mystery. The LOFAR TwoMetre Sky Survey of the 350 sq degHETDEX field is breaking new ground in the stud
The most Xray luminous and massive galaxy clusters are the most interestingobjects for astrophysical and cosmological studies. Completing our REFELX IIcluster survey, we added 10 of the most luminous