Estimating turbulent velocities in the elliptical galaxies NGC 5044 and NGC 5813 J. de Plaa, I. Zhuravleva, N. Werner, J. S. Kaastra, E. Churazov, R. K. Smith, A. J. J. Raassen and Y. G. Grange A&A, 539 (2012) A34 Published online: 22 February 2012 DOI: 10.1051/0004-6361/201118404