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Title:
Parametric Recovery of Line-of-Sight Velocity Distributions from Absorption-Line Spectra of Galaxies via Penalized Likelihood
Authors:
Cappellari, Michele; Emsellem, Eric
Affiliation:
AA(Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands; ), AB(Centre de Recherche Astronomique de Lyon, 9 Avenue Charles André, 69230 Saint Genis Laval, France; )
Publication:
The Publications of the Astronomical Society of the Pacific, Volume 116, Issue 816, pp. 138-147. (PASP Homepage)
Publication Date:
02/2004
Origin:
UCP
PASP Keywords:
Galaxies: Individual: NGC Number: NGC 3384, Galaxies: Kinematics and Dynamics, line: profiles, Methods: Numerical
DOI:
10.1086/381875
Bibliographic Code:
2004PASP..116..138C

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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