9 citations · 14 across the 3 of their papers we have counts for
3 papers
astro-ph.GA2017★ 5 cited
AGN with discordant optical and X-ray classification are not a physical family: Diverse origin in two AGN
I. Ordovás-Pascual, S. Mateos, F. J. Carrera +7
Approximately 3-17 percent of Active Galactic Nuclei (AGN) without detected rest-frame UV/optical broad emission lines (type-2 AGN) do not show absorption in X-rays. The physical o…
astro-ph.GA2014
Discordant optical and X-ray classification of AGN
I. Ordovás-Pascual, S. Mateos, F. J. Carrera +1
To provide insight into the apparent mismatch between the optical and X-ray absorption properties observed in 10-30 % of Active Galactic Nuclei (AGN), we have conducted a detailed…
astro-ph.IM2014★ 9 cited
A fast version of the k-means classification algorithm for astronomical applications
I. Ordovás-Pascual, J. Sánchez Almeida
Context. K-means is a clustering algorithm that has been used to classify large datasets in astronomical databases. It is an unsupervised method, able to cope very different types…