Author/Authors :
W.N. Brandt، نويسنده , , C. Vignali، نويسنده , , D.P. Schneider، نويسنده , , D.M. Alexander، نويسنده , , S.F. Anderson، نويسنده , , F.E. Bauer، نويسنده , , X. Fan، نويسنده , , G.P. Garmire، نويسنده , , S. Kaspi، نويسنده , , G.T. Richards، نويسنده ,
Abstract :
X-ray studies of high-redshift (z > 4) active galaxies have advanced substantially over the past few years, largely due to results from the new generation of X-ray observatories. As of this writing X-ray emission has been detected from nearly 60 high-redshift active galaxies. This paper reviews the observational results and their implications for models of the first massive black holes, and it discusses future prospects for the field.
