196 citations · 852 across the 22 of their papers we have counts for
22 papers
Novel SIMEX algorithm for autoregressive models to estimate AGN variability
Felipe Elorrieta, Wilfredo Palma, Susana Eyheramendy +2
The origin of the variability in accretion disks of active galactic nuclei (AGN) is still unknown, but its behavior can be characterized by modeling the time series of optical wave…
Online estimation methods for irregular autoregressive models
Felipe Elorrieta, Lucas Osses, Matias Cáceres +2
In the last decades, due to the huge technological growth observed, it has become increasingly common that a collection of temporal data rapidly accumulates in vast amounts. This p…
The Next Generation Virgo Cluster Survey. XXXIII. Stellar Population Gradients in the Virgo Cluster Core Globular Cluster System
Youkyung Ko, Eric W. Peng, Patrick Côté +24
We present a study of the stellar populations of globular clusters (GCs) in the Virgo Cluster core with a homogeneous spectroscopic catalog of 692 GCs within a major axis distance…
A Novel First-Order Autoregressive Moving Average Model to Analyze Discrete-Time Series Irregularly Observed
Cesar Ojeda, Wilfredo Palma, Susana Eyheramendy +1
A novel first-order autoregressive moving average model for analyzing discrete-time series observed at irregularly spaced times is introduced. Under Gaussianity, it is established…
State-space representation of Matérn and Damped Simple Harmonic Oscillator Gaussian processes
Andrés Jordán, Susana Eyheramendy, Johannes Buchner
Gaussian processes (GPs) are used widely in the analysis of astronomical time series. GPs with rational spectral densities have state-space representations which allow O(n) evaluat…
Searching for changing-state AGNs in massive datasets -- I: applying deep learning and anomaly detection techniques to find AGNs with anomalous variability behaviours
P. Sánchez-Sáez, H. Lira, L. Martí +14
The classic classification scheme for Active Galactic Nuclei (AGNs) was recently challenged by the discovery of the so-called changing-state (changing-look) AGNs (CSAGNs). The phys…