Testing of the dwarf galaxy content and the evolutionary status of nearby groups of galaxies

We carried out visual and parametric searches for dwarf galaxies in five loose groups of galaxies. Follow-up spectroscopy with the HET has shown a 50% success rate of morphological selection. The evolutionary status of the studied groups differs: while the NGC 6962 group has a partially relaxed core, surrounded by an infall region, the NGC 5005/5033 group and the IC 65 group, which consist only of late-type galaxies, are probably still assembling.Comment: 3 pages, 5 figures, to be published in Astronomische Nachrichten (proceedings of Symposium 6 of the JENAM 2008, Vienna

A Long-Run, Short-Run and Politico-Economic Analysis of the Welfare Costs of Inflation

This paper assesses the long-run and short-run (i.e. along the transition path) welfare implications of permanent changes in inflation in an environment with essential money and perfectly competitive markets. The model delivers a monetary distribution that matches moments of the distribution seen in the US data. Although there is potential for wealth redistribution to deliver welfare gains from inflation, the (total) costs of 10 percent inflation relative to zero is over 7 percent of consumption. While these results suggest a dominating real-balance effect of inflation, a politico-economic analysis concludes that the prevailing (majority rule) inflation rate is above the Friedman Rule.Inflation; Welfare; Transitions; Voting

Absorption Spectrum of the NO Molecule. V - Survey of Excited States and Their Interactions

High resolution absorption spectrograms of excited nitrogen oxide molecular interaction

Tuning the Diradical Character and Singlet-Triplet Energy Gap in Diindenoanthracene Derivatives

Resumen de la conferenciaOver the last few years we have been utilizing the indenofluorene scaffold1 and, more recently, pi-extended derivatives2 to explore diradical character on a fundamental level. Altering either the center acene core or the outer arene unit results in molecules with varying diradical character values (y) while also changing the singlet-triplet energy gap (EST) of the resultant diradicaloids. Although the literature in recent years has seen a huge increase in the number of new diradicaloids with unique properties, there are very few cases in which modifications are made to the original scaffolds after their initial publication to refine or change the singlet-triplet energy gap or the y index. This is often due to the inherent instability and complex synthesis of such molecules, which makes modification of the original molecule difficult. If the posited applications for organic diradicals are to come to fruition, the ability to incrementally change these properties while maintaining stability will be crucial. To that end computations on a series of modified diindenoanthracene derivatives illustrate the potential to tune these properties incrementally (Figure 1). In the interest of exploring these small changes in y and singlet-triplet gap from an experimental standpoint, the synthesis of these molecules and examination of their chemical, magnetic, and optoelectronic properties will be presented.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Inside Money, Credit, and Investment

This paper presents a monetary explanation for several business-cycle facts: (i) household and business investment are procyclical, (ii) business investment lags household investment, (iii) household investment is positively correlated with M1, and (iv) household credit outstanding is positively correlated with and more volatile than household investment. We develop a dynamic general equilibrium model that features financial intermediaries accepting deposits and providing loans, credit-producing firms, and inside (bank-created) money. It is shown that the transmission of monetary shocks facilitated by credit and inside money creation is able to reconcile these real and monetary observations regarding the cyclical behavior of investment.

Ionization of molecular hydrogen and deuterium by a frequency-doubled Ti:sapphire laser pulses

A theoretical study of the intense-field single ionization of molecular hydrogen or deuterium oriented either parallel or perpendicular to a linear polarized laser pulse (400 nm) is performed for different internuclear separations and pulse lengths in an intensity range of $(2-13)\times10^{13}$W cm$^{-2}$. The investigation is based on a non-perturbative treatment that solves the full time-dependent Schr\"odinger equation of both correlated electrons within the fixed-nuclei and the dipole approximation. The results for various internuclear separations are used to obtain the ionization yields of molecular hydrogen and deuterium in their ground vibrational states. An atomic model is used to identify the influence of the intrinsic diatomic two-center character of the problem.Comment: 13 pages, 9 figure