El análisis de los espectros de regiones HII permite determinar las condiciones físicas y abundancias químicas del medio interestelar donde se encuentran. Tradicionalmente, el método más utilizado para determinar abundancias de elementos más pesados que el He en nebulosas ionizadas se basa en el análisis de las líneas de excitación colisional (LEC)

We study the carbon monoxide (CO) excitation, mean molecular gas density, and interstellar radiation field (ISRF) intensity in a comprehensive sample of 76 galaxies from local to high redshift (z ∼ 0-6), selected based on detections of their CO transitions J = 2 → 1 and 5 → 4 and their optical/infrared/(sub)millimeter spectral energy distributions

The High Angular Resolution Monolithic Optical and Near-infrared Integral field spectrograph (HARMONI) is the visible and near-infrared (NIR), adaptive-optics-assisted, integral field spectrograph for ESO's Extremely Large Telescope (ELT). It will have both a single-conjugate adaptive optics (SCAO) mode (using a single bright natural guide star)

HIRES will be the high-resolution spectrograph at optical and near-infrared (NIR) wavelengths for ESO's Extremely Large Telescope (ELT). It will consist of three fibre-fed spectrographs providing a wavelength coverage of 0.4–1.8 µm (with a goal of 0.35–1.8 µm) at a spectral resolution of ~ 100 000. Fibre-feeding allows HIRES to have several

The evolution of the most massive stars is a puzzle with many missing pieces. Statistical analyses are key to providing anchors to calibrate theory, but performing these studies is an arduous job. The state-of-the-art integral field spectrograph Multi Unit Spectroscopic Explorer (MUSE) has stirred up stellar astrophysicists, who are excited about