The star formation history of CALIFA galaxies: Radial structures

We have studied the radial structure of the stellar mass surface density (μ∗) and stellar population age as a function of the total stellar mass and morphology for a sample of 107 galaxies from the CALIFA survey. We applied the fossil record method based on spectral synthesis techniques to recover the star formation history (SFH), resolved in space and time, in spheroidal and disk dominated galaxies with masses from 10^9 to 10^12 M_⊙. We derived the half-mass radius, and we found that galaxies are on average 15% more compact in mass than in light. The ratio of half-mass radius to half-light radius (HLR) shows a dual dependence with galaxy stellar mass; it decreases with increasing mass for disk galaxies, but is almost constant in spheroidal galaxies. In terms of integrated versus spatially resolved properties, we find that the galaxy-averaged stellar population age, stellar extinction, and μ_∗ are well represented by their values at 1 HLR. Negative radial gradients of the stellar population ages are present in most of the galaxies, supporting an inside-out formation. The larger inner (≤1 HLR) age gradients occur in the most massive (10^11 M_⊙) disk galaxies that have the most prominent bulges; shallower age gradients are obtained in spheroids of similar mass. Disk and spheroidal galaxies show negative μ∗ gradients that steepen with stellar mass. In spheroidal galaxies, μ∗ saturates at a critical value (~7 × 10^2 M_⊙/pc^2 at 1 HLR) that is independent of the galaxy mass. Thus, all the massive spheroidal galaxies have similar local μ_∗ at the same distance (in HLR units) from the nucleus. The SFH of the regions beyond 1 HLR are well correlated with their local μ_∗, and follow the same relation as the galaxy-averaged age and μ_∗; this suggests that local stellar mass surface density preserves the SFH of disks. The SFH of bulges are, however, more fundamentally related to the total stellar mass, since the radial structure of the stellar age changes with galaxy mass even though all the spheroid dominated galaxies have similar radial structure in μ_∗. Thus, galaxy mass is a more fundamental property in spheroidal systems, while the local stellar mass surface density is more important in disks.

Development of data reduction pipelines for GTC instruments at the UCM

The UCM Instrumentation Group (GUAIX) is developing currently Data Reduction Pipelines (DRP) for four instruments of the GTC: EMIR, FRIDA, MEGARA and MIRADAS. The purpose of the DRPs is to provide astronomers scientific quality data, removing instrumental biases, calibrating the images in physical units and providing a estimation of the associated uncertainties.

Comparison of available measurements of the absolute air-fluorescence yield and determination of its global average value

Experimental results of the absolute air-fluorescence yield are given very often in different units (photons/MeV or photons/m) and for different wavelength intervals. In this work we present a comparison of available results normalized to its value in photons/MeV for the 337 nm band at 1013 hPa and 293 K. The conversion of photons/m to photons/MeV requires an accurate determination of the energy deposited by the electrons in the field of view of the experimental set-up. We have calculated the energy deposition for each experiment by means of a detailed Monte Carlo simulation and the results have been compared with those assumed or calculated by the authors. As a result, corrections to the reported fluorescence yields are proposed. These corrections improve the compatibility between measurements in such a way that a reliable average value with uncertainty at the level of 5% is obtained.

Edición y estudio de Bencimarte de Lusitania

La historia del invencible y clarísimo principe Bencimarte de Lusitania, emperador del gran Cairo y de otros principes de su linaje, is a handwritten Romance of Chivalries found by José Manuel Lucía Megías in the library of the Royal Palace in Madrid. There are two known copies in the forementioned library. The two copies (B1 and B2) dońt have the same content, the depth of the work is found in B1 which is selected for this thesis whereas in B2 we could only find incoherent and unconnected parts due to book binding and covering as some texts had been lost. In the present work is going to be offered a manuscript description, inner and outer features, dating issues, text variations, narrative voices and structure, chronology and worḱs primary and secondary sources, characters, summaries, arguments and what́s new according to the world of chivalry. Our initial aim was to set a conclusive text of Bencimarte de Lusitania as to it has remained unknown for the reader until nowadays. It dealt with the transcription of both manuscripts, reinterprated their contents and compared them with the original texts. On the other hand, we could make a critical edition of the final version which highlighted Bencimarte himself and its possible interpretations. Thus, we could suitably arrange the text in its period as there is no date on it by means of the text itself or any further reference. We will do the same regarding to either the author or the authors. We would study the book itself offering an interpretation and a deep analysis of its elements, both the structural ones and those that belong to Romance of Chivelries themselves (mythical and marvellous adventures, knights and ladies , prodigious characters, the topic of the found manuscript, challenges and so on) as well as what is new and unique in this work of art which means to follow a pattern apart from introducing something new in the Chivelry books...