Parametric Recovery of Line‐of‐Sight Velocity Distributions from Absorption‐Line Spectra of Galaxies via Penalized Likelihood | Zendy

Michele Cappellari | Zendy; Éric Emsellem | Zendy

Open Access

Parametric Recovery of Line‐of‐Sight Velocity Distributions from Absorption‐Line Spectra of Galaxies via Penalized Likelihood

Author(s) -

Michele Cappellari,

Éric Emsellem

Publication year - 2004

Publication title -

publications of the astronomical society of the pacific

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.294

H-Index - 172

eISSN - 1538-3873

pISSN - 0004-6280

DOI - 10.1086/381875

Subject(s) - galaxy , physics , stellar kinematics , line of sight , stars , astrophysics , parametric statistics , line (geometry) , spectrograph , velocity dispersion , non line of sight propagation , spectral line , astronomy , computer science , mathematics , statistics , geometry , telecommunications , wireless , milky way

We investigate the accuracy of the parametric recovery of the line-of-sightvelocity distribution (LOSVD) of the stars in a galaxy, while working in pixelspace. Problems appear when the data have a low signal-to-noise ratio, or theobserved LOSVD is not well sampled by the data. We propose a simple solutionbased on maximum penalized likelihood and we apply it to the common situationin which the LOSVD is described by a Gauss-Hermite series. We compare differenttechniques by extracting the stellar kinematics from observations of the barredlenticular galaxy NGC 3384 obtained with the SAURON integral-fieldspectrograph.

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