11 papers · 1 filter
Automated Determination of Stellar Population Parameters in Galaxies Using Active Instance-based Learning
Thamar Solorio, Olac Fuentes, Roberto Terlevich +2
In this work we focus on the determination of the relative distributions of young, intermediate-age and old populations of stars in galaxies. Starting from a grid of theoretical po…
Age determination of the nuclear stellar population of Active Galactic Nuclei using Locally Weighted Regression
Trilce Estrada-Piedra, Juan Pablo Torres-Papaqui, Roberto Terlevich +2
We present a new technique to segregate old and young stellar populations in galactic spectra using machine learning methods. We used an ensemble of classifiers, each classifier in…
The Lyman-alpha emission in local Star-Forming Galaxies: Scenario and Connection with Primeval Galaxies
D. Kunth, E. Terlevich, R. Terlevich +1
We review the Lyan alpha emission in local star-forming galaxies. In most cases as already shown by the IUE, the emission is absent or much weaker than expected. This occurs becaus…
HST study of Lyman-alpha emission in star-forming galaxies: the effect of neutral gas flows
D. Kunth, J. M. Mas-Hesse, E. Terlevich +3
We present high dispersion HST GHRS UV spectroscopic observations of 8 HII galaxies covering a wide range of metallicities and physical properties. We have found Lyalpha emission i…
The colours of z=2 QSO host galaxies
I. Aretxaga, R. J. Terlevich, B. J. Boyle
Three high-redshift (z=2) and high luminosity (M_B < -28 mag for Ho = 50, qo=0.5) QSOs, two radio-quiet one radio-loud, were imaged in R, I and K bands. The luminosities, colours a…
The hosts of QSOs
Itziar Aretxaga, Brian J. Boyle, Roberto J. Terlevich
We present results of the hosts of four high-redshift () and high luminosity ($M_B \lsim -28$ mag) QSOs, three radio-quiet one radio-loud, imaged in R and K bands. The…