Parametric Recovery of Line‐of‐Sight Velocity Distributions from Absorption‐Line Spectra of Galaxies via Penalized Likelihood
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- 1 February 2004
- journal article
- Published by IOP Publishing in Publications of the Astronomical Society of the Pacific
- Vol. 116 (816) , 138-147
- https://doi.org/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.Comment: 7 pages, 7 figures, LaTeX (uses emulateapj). To appear in PASP, v.116, 2004 February. Software implementing the pPXF method described in this paper is available at http://www.strw.leidenuniv.nl/~mcappell/idlKeywords
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