摘要:

AbstractVirial parameters of individual groups and of synthesized groups of galaxies are determined on the basis of a new list of nearby groups of galaxies (V0<3200 km/s). Small values of the crossing time ({TcrosH0} ≈ 0.2) allow us to consider the groups of being gravitationally bound systems. The cumulative mass of the synthesized groups increases up to ∼1 Mpc from the center, giving the total mass‐to‐luminosity ratiof= 97f⊙(H0= 75 km/s/Mpc). Statistically significant correlations between virial parameters (σv,RVT,f) are found:f∝ σv1.5andf∝RVT0.7; σvandRVT

ISSN:0004-6337    

DOI:10.1002/asna.2113070302

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113070304

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractIt is a general belief that in some early stages of the evolution of the Universe unequilibrium situations played important role. In order to incorporate some deviations from thermal equilibrium into the description of the evolution, here an extension of the thermodynamic formalism is given, where, using the notion of ekaentropy, new terms are introduced into the Gibbs‐Duhem relation for representing the deviation. Two situations are investigated in simplified models: the primordial thermalisation in the symmetric phase of GUT, and the development of a nonthermal distribution for massive neutrino

ISSN:0004-6337    

DOI:10.1002/asna.2113070306

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113070307

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractThe sensitivity of accretion disk models with respect to its inner boundary conditions, being located in the strong gravity region of a highly compact central body, is used to discuss a possibility of strong field tests of gravitation via compact source observations. Within the bimetric theory of gravitation the optically thin bremsstrahlung model is calculated as an example for this possibility. Using this model to describe the innermost region of the “bimetric disk”, significant differences with respect to the corresponding results in Einstein's theory were found. The more massiv and compact “bimetric disk” radiates softer with higher lum

ISSN:0004-6337    

DOI:10.1002/asna.2113070308

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113070309

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractCharged particle motion is studied in magnetic fields with an inversion of field direction and a strong curvature in the reversal region, that means field structures which are expected to play a crucial role in energetics and dynamics of space plasma. Investigations are performed in a typical field model. Due to its symmetry and stationarity two of the integrals of motion of the resulting Hamiltonian immediately arise. The question is analyzed whether the system is integrable (this means regular solutions exist) and of what kind the third integral is. Two different third integrals are found, which are valid in different parts of the phase space. Their validity is estimated analytically for particles, crossing the neutral plane (z= 0) ‐‐ in addition the action integralIzpreviously unusual in plasma applications is verified numerically. Further numerical research establishes that there are no more third integrals ‐‐ all remaining parts of the phase space are filled with chaotic solutions.Because in strongly curved field reversals the conservation of the magnetic moment as an integral of motion is shown to be restricted to very small energies or very large pitch angles, the unusualIz‐integral will be an important tool for solution of plasma problems of cosmical current sheets and plasma b

ISSN:0004-6337    

DOI:10.1002/asna.2113070310

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113070312

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractDie Lösung der Feldgeichungen des Magnetfeldes im Mantel ist Voraussetzung für die theoretische Behandlung vieler geophysikalischer Probleme. Es werden die Feldgleichungen für ein sphärisches Erdmodell in skalarer Form aufgeschrieben und analytisch darstellbare Lösungen angegeben. Die Randbedingungen werden unter dem Gesichtspunkt diskutiert, daß im Erdkern ein Dynamoprozeß stattfindet und für die Erdoberfläche eine aus Meßinformationen ermittelte Felddarstellung existiert. Es wird die Frage aufgeworfen, inwieweit das Feld im Mantel bei bestimmten Modellanahmen durch diese Felddarstellung bes

ISSN:0004-6337    

DOI:10.1002/asna.2113070313

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractVerschiedene Methoden zur Ermittlung mittlerer Zyklenlängen werden beschrieben, und der Einflß von Beobachtungslücken wird diskutiert. Am Beispiel von SW UMa werden statistische Aussagen und direktere Bestimmungen verglichen; die übereinstimmung ist nicht schle

ISSN:0004-6337    

DOI:10.1002/asna.2113070314

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY