Thirty years later
نویسنده
چکیده
Elliptical galaxies are modelled as homeoidally striated Jacobi ellipsoids (Caimmi & Marmo 2005) where the peculiar velocity distribution is anisotropic, or equivalently as their adjoints configurations i.e. classical Jacobi ellipsoids of equal mass and axes, in real or imaginary rotation (Caimmi 2006). Reasons for the coincidence of bifurcation points from axisymmetric to triaxial configurations in both the sequences (Caimmi 2006), contrary to earlier findings (Wiegandt 1982a,b; Caimmi & Marmo 2005) are presented and discussed. The effect of centrifugal support at the ends of the major equatorial axis, is briefly outlined. The existence of a lower limit to the flattening of elliptical galaxies is investigated in dealing with a number of limiting situations. More specifically, (i) elliptical galaxies are considered as isolated systems, and an allowed region within Ellipsoidland (Hunter & de Zeeuw 1997), related to the occurrence of bifurcation points from ellipsoidal to pear-shaped configurations, is shown to be consistent with observations; (ii) elliptical galaxies are considered as embedded within dark matter haloes and, under reasonable assumptions, it is ∗Astronomy Department, Padua Univ., Vicolo Osservatorio 2, I-35122 Padova, Italy email: [email protected]
منابع مشابه
Serum leptin, plasma glucose and lactate changes following aerobic exhaustive incremental exercise in trained men 18-26 years old
Aims: The aim of this study examined the acute effects of exhaustive incremental exercise on serum leptin, glucose and lactate in one session in trained men 18-26 years old. Materials and Methods: Thirty students who had 18-26 years old, body fat between 15-25 percent and VO2max between 35-45 ml/kg/min, simple randomly selected through 200 physical education students and they were divided into...
متن کاملEffect of magnesium sulfate on hyperthermia and pentylen-tetrazol-induced seizure in developing rats
Objective(s): Febrile seizures (FS) are the most common type of convulsive events among children. Its prevalence has been estimated to be 2-5% in children between 3 months and 5 years old. Also, blood and CSF magnesium levels have been demonstrated to be reduced in children with FS. This study investigates the effect of MgSo4 pretreatment on the behaviors caused by hyperthermia (HT) and effect ...
متن کاملThirty Years Later: Evolution of Treatment for Acute Left Main Coronary Artery Occlusion
Acute occlusion of left main coronary artery is a catastrophic event. We describe two patients with acute occlusion of the left main coronary artery treated thirty years apart. The first patient was treated in 1982 and survived the event without revascularization but developed severe heart failure. His survival was so unusual that it merited a case report at that time. The second patient was tr...
متن کامل