Evolution of the Globular Cluster System in a Triaxial Galaxy

Dynamical friction and tidal disruption are effective mechanisms of evolution of globular cluster systems, especially in non-axysimmetric galaxies with a central compact nucleus. With a semi-analytical approach based on the knowledge of the dependence of the dynamical friction and tidal disruption effects on the relevant parameters, we are able to follow the time evolution of the globular cluster system in a model of a triaxial galaxy and give its observable properties to compare with observational data. An important result is that the flatter distribution of the globular cluster system relatively to that of the stellar bulge, as observed in many galaxies, can be explained by the evolution of the globular cluster system, starting from the same density profile.Comment: 9 pages, including 7 eps figures; latex file using standard MNRAS style file. Paper submitted to MNRA

Globular cluster system erosion and nucleus formation in elliptical galaxies

The radial distribution of globular clusters in galaxies is always less peaked to the centre than the halo stars'. Extending previous work to a sample of HST globular cluster systems in ellipticals, we evaluate the number of clusters lost to the galactic centre as the integrals of the difference between the observed globular cluster system distribution and the underlying halo light profile. It results that the initial populations of globular clusters were from 25% to 50% richer than now. This significant number of missing globular clusters supports the hypothesis that a large quantity of globular cluster mass in form of globular clusters decayed and destroyed has been lost to the galactic centres, where plausibly contributed to formation and feeding of a mas sive object therein. It is relevant noting that the observed correlation between the core radius of the globular cluster system and the parent galaxy luminosity can be interpreted as a result of evolution.Comment: Latex file + 2 figures as postscript files; it needs standard MNRAS style file and epsf macro for figures. Paper submitted to MNRA

Effects of different drugs on endogenous opioid activity in postmenopausal women: clinical effects and gonadotropin response to naloxone

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Pattern sintomatologico, peso corporeo ed abitudini di vita in un gruppo di donne in peri- e post-menopausa

Allo scopo di tracciare un profilo delle donne in menopausa che includesse il pattern sintomatologico ed alcune abitudini di vita quali il fumo, le caratteristiche dell’alimentazione e l’ attività fisica, abbiamo esaminato un gruppo di donne sane affluenti agli ambulatori della Prima Clinica Ostetrica e Ginecologica dell’ Università degli Studi di Roma “Sapienza”