Departament d'Astronomia i Meteorologia: Recent submissions
Now showing items 21-40 of 72
From ultrafine to coarse particles: variability and source apportionment of atmospheric aerosol levels in the urban Mediterranean climate
Air pollution is a major environmental and public health concern, especially in urban areas where both emission sources and population are concentrated. The pollution sources and the evolution of aerosols and gaseous ...
High performance computing of massive Astrometry and Photometry data from Gaia
Gaia is an extremely ambitious astrometric space mission adopted within the scientific programme of the European Space Agency (ESA) in October 2000. It aims to measure with very high accuracy the positions, motions and ...
Non-thermal emission from high-energy binaries through interferometric radio observations
High-mass binary systems involve extreme environments that produce non-thermal emission from radio to gamma rays. Only three types of these systems are known to emit persistent gamma-ray emission: colliding-wind binaries, ...
Climate change and precipitation trends in the northern Mediterranean
According to climate projections for the end of the twenty-first century, regional responses to global warming include a strong and widespread drying over the northern Mediterranean, particularly intense in summer. Many ...
Physics of the Intergalactic Medium: a Study of the Power Spectrum ot the Lyman Alpha Forest and the Metal Content of Damped Lyman Alpha Systems
El Medi Intergalàctic permet una caracterització de propietats bàsiques de l'univers tals com paràmetres fonamentals del model cosmològic, el creixement de pertorbacions primordials de densitat i formació de galàxies. ...
On the characterisation of the Galactic warp in the Gaia era
We explore the possibility of detecting and characterising the warp of the stellar disc of our Galaxy using synthetic Gaia data and two available proper motion catalogues namely UCAC4 and PPMXL. We develop a new kinematic ...
Modelització de precipitacions intenses en zones d'orografia complexa: casos d'estudi al Pirineu Oriental
Els episodis de precipitació intensa en zones de muntanya sovint es veuen afavorits pels efectes orogràfics que actuen com a mecanismes que modifiquen la precipitació. Aquest treball vol contribuir a millorar el coneixement ...
Milky Way-like galaxy simulations in the Gaia era: disk large scale structures and baryonic content
Simulations have shown to be one of the best tools to study properties of galactic large scale structures and their effects on to the local kinematics of stars. The aims of this thesis are: i) To obtain realistic N-body ...
The evolution of the Brewer-Dobson circulation and the ozone layer during the last three decades
In 1985 Joseph Farman and his colleagues of the British Antarctic Survey published a paper [Farman et al. 1985] showing that the total ozone content of the atmosphere during the Antarctic spring had decreased dramatically ...
High energy processes in young stellar objects and high-mass X-ray binaries
The high energy astrophysics, specifically the gamma-ray astrophysics, studies the processes that cannot be caused by hot matter but by other mechanisms colled non thermaland processes, which involve matter with energies ...
Tracing the Perseus spiral arm in the anticenter direction
The main purpose of this thesis is to map the radial variation of the stellar density for the young stellar population in the Galactic anticenter direction in order to understand the structure and location of the Perseus ...
Study of Adaptive Optics Images by means of Multiscalar Transforms
Adaptive optics (AO) systems are used to increase the spatial resolution achieved by ground-based telescopes, which are limited by the atmospheric motion of air layers above them. Therefore, the real cut-off frequency is ...
Galaxy evolution: A new version of the Besançon Galaxy Model constrained with Tycho data
The understanding of the origin and evolution of the Milky Way is one of the primary goals of the Gaia mission (ESA, launch autumn 2013). In order to study and analyse fully the Gaia data it will be useful to have a Galaxy ...
The use of Java in large scientific applications in HPC environments
Java is a very commonly used computer programming language, although its use amongst the scientific and High Performance Computing (HPC) communities remains relatively low. In this thesis, the option of using Java for ...
Structure and nature of gamma-ray binaries by means of VLBI observations
Gamma-ray binaries are extreme systems that produce non-thermal emission from radio to very-high-energy (above TeV) gamma rays, with the energy output in the spectral energy distribution (SED) dominated by the MeV–GeV ...
Implementing the Gaia Astrometric Solution
As is the way with books in general this document is presented in the form of chapters (seven in number) devoted to individual topics relating to the overall topic of Gaia astrometric data processing. We progress logically ...
Ciclogénesis intensas en la cuenca occidental del Mediterráneo y temperatura superficial del mar: Modelización y evaluación de las áreas de recarga
Una característica propia de las precipitaciones en el área del Mediterráneo Occidental es la torrencialidad. En el marco de unas precipitaciones anuales no muy abundantes, típicas del clima mediterráneo, se registran ...
Magnetized Dense Cores. Observational characterization and comparison with models
It is some observational evidence that dense cores are the birthplace of low-mass stars. These regions, apparently quiescent, are capable of surviving several free-fall times and, potentially, collapse and form stars. ...
Modelització i simulació fotoquímica mesoscalar del transport del material particulat i gasos a l’atmosfera
Durant les últimes dècades la quantitat de gasos i partícules contaminants que s’han injectat a l’atmosfera ha augmentat considerablement. Evidència d’aquesta informació són les elevades concentracions de diòxid de nitrogen ...
The star-forming core ahead of HH 80N: studying the interaction with a parsec scale jet
The region GGD 27, located in Sagittarius at a distance of 1.7 kpc, is an active star forming region. The most well-known observational signature of this region, the HH 80/81/80N jet, is one of the largest collimated jet ...
