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This article is an erratum for:

Volume 499, Number 1, May III 2009
Page(s) 45 - 46
Section Extragalactic astronomy
Published online 09 February 2009


Suppressed radio emission in supercluster galaxies: enhanced ram pressure in merging clusters?

J.-C. Mauduit1 - G. A. Mamon2,3

1 - Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France
2 - Institut d'Astrophysique de Paris (UMR 7095: CNRS & UPMC), 98 bis Bd. Arago, 75014 Paris, France
3 - Astrophysics & BIPAC, University of Oxford, Keble Rd, Oxford OX1 3RH, UK

A&A 475, 169-185 (2007), DOI: 10.1051/0004-6361/20077721

The paper ``Suppressed radio emission in supercluster galaxies: enhanced ram pressure in merging clusters'' was published in A&A 475, 169. There is a double typographical error in Appendix A. In Eqs. (A.2) and (A.9), which both express the squared aperture velocity dispersion of a respectively general and NFW (Navarro et al. 1996) spherical system, there is a factor 3 missing in the terms in front of the integrals, so that the squared aperture velocity dispersion should be 3 times smaller than given[*]. These two equations should thus read

\begin{displaymath}\sigma_{\rm ap}^2 (R) = {4\pi~G\over 3~M_{\rm p}(R)}~\left [\...
... {(r^2\!-\!R^2)^{3/2}\over r^2}~\rho(r)
M(r)~{\rm d}r \right ]
\end{displaymath} (A.2)


\begin{displaymath}\widetilde \sigma_v^2 (Y~r_{\rm vir}/c) = {c\over 3~g}~
...1}(1/Y) / \left \vert Y^2-1\right\vert^{1/2} + \ln(Y/2)} \cdot
\end{displaymath} (A.9)

However, all other equations (in particular Eqs. (A.10) and (A.11)) are correct as is the accompanying discussion.

Note that the derivation of Eq. (A.9) involves not only Eq. (A.2) of Mauduit & Mamon (2007) and Eq. (42) of okas & Mamon (2001), but also Eq. (43) of okas & Mamon.



... given[*]
This factor of 3 is also missing in Eq. (B.7) of Mamon & okas (2005), as reported by Mamon & okas (2006).

Copyright ESO 2009

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