Erratum: Hydrodynamic Simulations of the Sunyaev-Zeldovich Effect(s)

In the paper ``Hydrodynamic Simulations of the Sunyaev-Zeldovich Effect(s)'' by Volker Springel, Martin White, and Lars Hernquist (ApJ, 549, 681 [2001]), because of an error in converting units, the values presented for ``y'' and ``b'' were in fact ``y/h'' and ``b/h,'' where h=0.67 is the Hubble constant in units of 100 km s^-1 Mpc^-1. This implies that our published results for the mean Comptonization <y> have been too high by a factor of 1/h, and our power spectra for thermal and kinetic effect were too high by 1/h². In detail, the following corrections apply to the published paper: In Figure 2, the labels on the gray-scale bars should be y/h and b/h, respectively. In Figures 3 and 5, the label of the vertical axes should be l(l+1)C_l/2πh². The horizontal scale in Figures 7 (top panel) and in Figure 8 should be |S_ν|/h[mJy], and the vertical scale in Figure 8 should read S_ν/hdN/dlog[Jy deg^-1]. Our correct result for the mean Comptonization is <y>=2.6×10^-6 (see §§ 3.1 and 4), in better agreement with the results of previous authors. Similarly, the values for the mean Comptonization for our simulations with energy injection are in fact 6.9×10^-6, 16.6×10^-6, and 38.0×10^-6 (see the end of § 3.1). Despite the above quantitative corrections, all qualitative conclusions in our paper remain valid. We note that the error was fully restricted to a linear scaling of our final y- and b-maps and that other aspects of the computation, including our SPH simulations, were completely unaffected. Finally, we regret that we made a second mistake in the paper: In Figure 4, we misrepresented the result by Holder & Carlstrom (1999) by a factor of 2.73². Below we present a corrected version of this figure. We note that after correcting the mistake, our result is now closer to the mesh-based computations of Seljak et al. (2000), with the remaining difference being only a factor of 1.5-2, rather than 3-4, as was stated in the published paper.