Abstract
Mounting evidence from X-ray observations reveals that bound objects should have received a significant amount of nongravitational energy in the past. We report an instantaneous heating scheme, for which gases in dense regions receive a temperature increment of several keV at z = 2 whereas those in rarified regions remain intact, that can produce bound objects obeying the observed mass-temperature and luminosity-temperature relations. Such heating reduces the Sunyaev-Zel'dovich (SZ) flux by a factor of 3 - 2 on a scale of 4'-6'. It exacerbates the need for the matter-fluctuation normalization ?8 to assume an exceedingly high value (~1.2), if the several-arcminute excess cosmic microwave background anisotropy detected by the Cosmic Background Imager experiment is entirely caused by the SZ effect of intergalactic hot gas. By contrast, we find that the several-arcminute excess detected by Arcminute Cosmology Bolometer Array Receiver can be consistent with the preheated SZ signals of ?8 = 1.
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