A5016764340- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- Atmospheric and Environmental Gas Dynamics
- Astrophysical Phenomena and Observations
- Atomic and Subatomic Physics Research
- Gamma-ray bursts and supernovae
- Spectroscopy and Chemometric Analyses
- Phase Equilibria and Thermodynamics
Institute for Research in Fundamental Sciences
2022
Instituto de Astrofísica de Canarias
2019-2022
Universidad de La Laguna
2019-2022
Many recent studies have pointed out significant discrepancies between observations and models of stellar populations in the near-infrared (NIR). With current future observing facilities being focused this wavelength range, properly assessing solving these issues is utmost importance. Here, we present first application extragalactic globular cluster (GC) spectroscopy survey, evidence that GCs reveal an age zero-point problem population synthesis (SPS) models. This has already been identified...
ABSTRACT Massive Early-Type Galaxies (ETGs) in the local Universe are believed to be most mature stage of galaxy evolution. Their stellar population content reveals evolutionary history these galaxies. However, while state-of-the-art Stellar Population Synthesis (SPS) models provide an accurate description observed spectra optical range, modelling Near-Infrared (NIR) is still its infancy. Here, we focus on NIR CO absorption features show, a systematic and comprehensive manner, that for...
We present new H - and K -band spectroscopy for the bulge of M31, taken with LUCI spectrograph at Large Binocular Telescope (LBT). studied radial trends CO absorption features (namely, CO1.58, CO1.60, CO1.64, CO1.66, CO1.68, CO2.30, CO2.32, CO2.35) in out to a galactocentric distance ∼100″ (∼380 pc). find that most COs do not exhibit strong gradient, despite metallicity gradient inferred from optical spectral range, except showing steep increase center. compared observed line strengths...
Context. One way to constrain the evolutionary histories of galaxies is analyse their stellar populations. In local Universe, our understanding population properties has traditionally relied on study optical absorption and emission-line features. Aims. order overcome limitations intrinsic this wavelength range, such as age-metallicity degeneracy high sensitivity dust reddening, we must use ranges beyond optical. The near-infrared (NIR) offers a possibility extract information spectral...
ABSTRACT Stellar population studies provide unique clues to constrain galaxy formation models. So far, detailed based on absorption line strengths have mainly focused the optical spectral range although many diagnostic features are present in other windows. In particular, near-infrared (NIR) can a wealth of information about stars, such as evolved giants, that less evident signatures. Due significant advances NIR instrumentation and extension libraries stellar synthesis (SPS) models this...
Using samples drawn from the Sloan Digital Sky Survey, we study for first time relation between large-scale environments (Clusters, Groups and Voids) stellar Initial Mass Function (IMF). We perform an observational approach based on comparison of IMF-sensitive indices quiescent galaxies with similar mass in varying environments. These are selected within a narrow redshift interval ($ 0.020 < z 0.055 $) spanning range velocity dispersion 100 to 200 kms$^{-1}$. The results this paper upon...
ABSTRACT Massive early-type galaxies (ETGs) show several strong CO absorption features in their H- and K-band spectra that cannot be explained by state-of-the-art stellar population models. For many years, the disagreement has been attributed to presence of intermediate-age components are dominated stars asymptotic giant branch phase. However, no robust evidence this scenario provided so far. One way test claim is comparison indices for ETGs relic galaxies. Lacking populations, provide us...
We present new H- and K-band spectroscopy for the bulge of M31, taken with LUCI spectrograph at Large Binocular Telescope (LBT). studied radial trends CO absorption features (namely, CO1.58, CO1.60, CO1.64, CO1.66, CO1.68, CO2.30, CO2.32, CO2.35) in out to a galactocentric distance 100'' (380pc). find that most COs do not exhibit strong gradient, despite metallicity gradient inferred from optical spectral range, except showing steep increase center. compared observed line strengths...
Many recent studies have pointed out significant discrepancies between observations and models of stellar populations in the near-infrared (NIR). With current future observing facilities being focused this wavelength range, properly assessing solving these issues is utmost importance. Here, we present first application extragalactic globular cluster (GC) spectroscopy survey, evidence that GCs reveal an age zero-point problem population synthesis (SPS) models. This has already been identified...
Abstract It is generally recognized that massive galaxies form through a combination of in-situ collapse and ex-situ accretion. The component forms early, where gas compaction leads to the formation compact systems (blue red “nuggets”) seen at z > 1. subsequent accretion satellites brings in material, growing these nuggets size mass appear as early-type (ETGs) we see locally. Due stochasticity process, few rare cases nugget will evolve present day having undergone little resulting...