Robust 1-norm Periodograms for Analysis of Noisy Non-Gaussian Time Series with Irregular Cadences: Application to VLBI Astrometry of Quasars - Faculté des Sciences de Sorbonne Université
Article Dans Une Revue Publications of the Astronomical Society of the Pacific Année : 2024

Robust 1-norm Periodograms for Analysis of Noisy Non-Gaussian Time Series with Irregular Cadences: Application to VLBI Astrometry of Quasars

Valeri V. Makarov
  • Fonction : Auteur
Phil Cigan
  • Fonction : Auteur
Christopher Dilullo
  • Fonction : Auteur
David Gordon
  • Fonction : Auteur

Résumé

Astronomical time series often have non-uniform sampling in time, or irregular cadences, with long gaps separating clusters of observations. Some of these data sets are also explicitly non-Gaussian with respect to the expected model fit, or the simple mean. The standard Lomb–Scargle periodogram is based on the least squares solution for a set of test periods and, therefore, is easily corrupted by a subset of statistical outliers or an intrinsically non-Gaussian population. It can produce completely misleading results for heavy-tailed distribution of residuals. We propose a robust 1-norm periodogram technique, which is based on the principles of robust statistical estimation. This technique can be implemented in weighted or unweighted options. The method is described in detail and compared with the classical least squares periodogram on a set of astrometric VLBI measurements of the ICRF quasar IERS B0642+449. It is uniformly applied to a collection of 259 ICRF3 quasars each with more than 200 epoch VLBI measurements, resulting in a list of 49 objects with quasi-periodic position changes above the 3σ level, which warrant further investigation.
Fichier principal
Vignette du fichier
Makarov_2024_PASP_136_054503.pdf (4.8 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-04858856 , version 1 (30-12-2024)

Licence

Identifiants

Citer

Valeri V. Makarov, Sébastien Lambert, Phil Cigan, Christopher Dilullo, David Gordon. Robust 1-norm Periodograms for Analysis of Noisy Non-Gaussian Time Series with Irregular Cadences: Application to VLBI Astrometry of Quasars. Publications of the Astronomical Society of the Pacific, 2024, 136, ⟨10.1088/1538-3873/ad4b9f⟩. ⟨insu-04858856⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

More