Parametric Recovery of Line‐of‐Sight Velocity Distributions from Absorption‐Line Spectra of Galaxies via Penalized Likelihood
2004/02/01 by Michele Cappellari, Eric Emsellem, Éric Emsellem · 37 citations
Physics and Astronomy · Computer Science · Agricultural and Biological Sciences · #Galaxies: Formation, Evolution, Phenomena #Advanced Vision and Imaging #Leaf Properties and Growth Measurement
paper · pdf · doi:10.1086/381875
Abstract
We investigate the accuracy of the parametric recovery of the line-of-sight velocity distribution (LOSVD) of the stars in a galaxy, while working in pixel space. Problems appear when the data have a low signal-to-noise ratio, or the observed LOSVD is not well sampled by the data. We propose a simple solution based on maximum penalized likelihood and we apply it to the common situation in which the LOSVD is described by a Gauss-Hermite series. We compare different techniques by extracting the stellar kinematics from observations of the barred lenticular galaxy NGC 3384 obtained with the SAURON integral-field spectrograph.
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