Ionization by early quasars and Cosmic Microwave Background anisotropies

Abstract

We discuss the photoionization of the intergalactic medium by early formed quasars and propose a mechanism which could generate measurable temperature fluctuations ${\delta }_T=\Delta T/T$ of the cosmic microwave background (CMB). Early quasars produce individual ionized regions around themselves. We evaluate both thermal and kinetic (first-order Doppler) Sunyaev-Zeldovich (SZ) effects associated with those ionized regions.

11 pages, 9 postscript figures, using l-aa.sty (included), gziped tar tex files; accepted (1995) in Astron.Astrophys