A5070647273- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Star Formation Studies
- Particle physics theoretical and experimental studies
- Adaptive optics and wavefront sensing
Osservatorio Astronomico di Padova
2024
University of Padua
2024
National University of San Juan
2021
Abstract In the past, high- z active galactic nuclei (AGNs) were given a minor role as possible drivers of reionization, despite initial evidence in favor their large space densities at low luminosities by Chandra and Hubble Space Telescope. Recent observations from JWST are finding relatively numbers faint AGNs > 4, convincingly confirming these early results. We present sample ∼ 5 AGNs, both wide, shallow ground-based surveys deep, pencil-beam JWST, allowing us to estimate with...
Aims. To explore the chemical pattern of early-type stars with planets, searching for a possible signature planet formation. In particular, we study likely relation between lambda Bootis and presence giant planets. Methods. We performed detailed abundance determination in sample without planets via spectral synthesis. Results. compared our (13 24 detected planets) those other chemically peculiar stars. have found four sample, two which present circumstellar disks (HR 8799 HD 169142) one (HD...
Near- to mid-Infrared observations (from Spitzer and JWST) have revealed a hidden population of galaxies at redshift z=3-6, called optically-dark objects, which are believed be massive dusty star-formers. While sources widely recognized as significant component the stellar mass function, history their assembly remains unexplored. However, they thought progenitors more early-type found in present-day groups clusters. It is thus important examine possible connection between dark merging...
In the past, high-z AGNs were given a minor role as possible drivers of reionization, despite initial evidences in favor their large space densities at low luminosities by Chandra and HST. Recent observations from JWST are finding relatively numbers faint z>4, convincingly confirming these early results. We present sample z~5 (both wide, shallow ground-based surveys deep, pencil-beam JWST), allowing to estimate with unprecedented accuracy. The bright end (M1450<-26) AGN luminosity function...