We present the analysis of the photometric and spectroscopic properties of a sample of 29 low redshift (z 0.6) QSOs for which both HST WFPC2 optical images and...
Biases in the estimation of velocity dispersions and dynamical masses for galaxy clusters
Using a set of 73 numerically simulated galaxy clusters, we have characterised the statistical and physical biases for three velocity dispersion and mass...
Bidimensional spectroscopy with optical fibers at the William Herschel and Nordic Optical Telescopes
In this communication we describe two optical fiber systems contrived to perform simultaneous bidimensional spectroscopy of extended objects: 2D_FIS and...