We report new observations of SL2S J021737–051329, a lens system consisting of a bright
arc at z= 1.84435, magnified∼ 17× by a massive galaxy at z= 0.65. SL2S0217 is a low-mass …

The increasing neutrality of the intergalactic medium at z> 6 suppresses Lyα emission, and
spectroscopic confirmation of galaxy redshifts requires the detection of alternative ultraviolet …

Context. H ii regions in galaxies are the sites of star formation, so they are special places for
understanding the build-up of stellar mass in the universe. The line ratios of this ionized gas …

We derive the metallicity (traced by the O/H abundance) of the narrow-line region (NLR) of
108 Seyfert galaxies as well as radial metallicity gradients along their galaxy discs and of …

We investigate the discrepancy between oxygen abundance estimations for narrow-line
regions of active galactic nuclei (AGNs) type Seyfert 2 derived using direct estimations of the …

This work presents the results from our near-infrared spectroscopy of narrow-band-selected
Hα emitters (HAEs) in two rich overdensities (PKS 1138− 262 at z= 2.2 and USS 1558− 003 …

We present a two-dimensional study of the gas distribution, excitation, and kinematics of the
OH absorber galaxy IRAS 19154+ 2704 using Gemini Multi-Object Spectrograph integral …

In this work, we used a grid of photoionization models combined with stellar population
synthesis models to derive reliable ionization correction factors (ICFs) for the sulphur in star …

In this paper, we derive oxygen abundance gradients from H ii regions located in 11
galaxies in eight systems of close pairs. Long-slit spectra in the range 4400–7300 Å were …

We built a grid of photoionization models and compiled already available observational
emission line intensities ((Å)< 2000) of confirmed star formation regions and Active Galactic …