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Effects of Preheated Clusters on the CMB Spectrum | | Kai-Yang Lin
; Lihwai Lin
; Tak-Pong Woo
; Yao-Huan Tseng & Tzihong Chiueh
; | | Date: |
15 Oct 2002 | | Journal: | Astrophys.J. 608 (2004) L1-L4 | | Subject: | astro-ph | | Abstract: | Mounting evidence from $x$-ray observations reveals that bound objects should receive some form of energy in the past injected from non-gravitaional sources. We report that an instantaneous heating scheme, for which gases in dense regions were subjected to a temperature jump of 1keV at $z=2$ whereas those in rarified regions remained intact, can produce bound objects obeying the observed mass-temperature and luminosity-temperature relations. Such preheating lowers the peak Sunyaev-Zeldovich (SZ) power by a factor of 2 and exacerbates the need for the normalization of matter fluctuations $sigma_8$ to assume an extreme high value $(sim 1.1)$ for the SZ signals to account for the excess anisotropy on 5-arcminute scale detected by the Cosmic Background Imager in the cosmic microwave background radiation. | | Source: | arXiv, astro-ph/0210323 | | Services: | Forum | Review | PDF | Favorites | |
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