Context. Models of stellar spectra are necessary for interpreting light from individual stars, planets, integrated stellar populations, nebulae, and the interstellar medium. Aims: We provide a comprehensive and homogeneous collection of synthetic spectra for a wide range of atmospheric parameters and chemical compositions. Methods: We compile

We introduce a set of clockwork models of flavor that can naturally explain the large hierarchies of the Standard Model quark masses and mixing angles. Since the clockwork only contains chains of new vector-like fermions without any other dynamical fields, the flavor constraints allow for relatively light new physics scale. For two benchmarks with

Context. Convective motions in solar-type stellar atmospheres induce Doppler shifts that affect the strengths and shapes of spectral absorption lines and create slightly asymmetric line profiles. One-dimensional (1D) local thermodynamic equilibrium (LTE) studies of elemental abundances are not able to reproduce this phenomenon, which becomes

Gemini Multi Object Spectrograph medium-resolution spectra and photometric data of 39 objects in the field of the radio galaxy 3C 17 are presented. Based on the new data, a previously uncataloged cluster of galaxies is identified at a mean redshift of z = 0.220 ± 0.003, a projected virial radius of 0.37 Mpc, and a velocity dispersion of σ v = 821 ±

This thesis focus on understanding the physical properties of galaxies at redshifts 2.3 < z < 3.3, a time period called Cosmic Noon when galaxies were actively forming stars and evolving rapidly. The work involves the study of different galaxy populations, from young Lyα emitters (LAEs) and Lyman break galaxies (LBGs), to more evolved, and very

En las últimas décadas, la comunidad astrofı́sica ha realizado un gran esfuerzo para entender la formación y evolución de las galaxias. A pesar de la gran cantidad de estudios teóricos en este campo, se requieren trabajos observacionales más numerosos y detallados para testear estos modelos. En galaxias cercanas, varios estudios observacionales han