Search results for "Virgo Cluster"

showing 3 items of 3 documents

GRAVITATIONAL WAVE SIGNATURES IN BLACK HOLE FORMING CORE COLLAPSE

2013

We present numerical simulations in general relativity of collapsing stellar cores. Our initial model consists of a low metallicity rapidly-rotating progenitor which is evolved in axisymmetry with the latest version of our general relativistic code CoCoNuT, which allows for black hole formation and includes the effects of a microphysical equation of state (LS220) and a neutrino leakage scheme to account for radiative losses. The motivation of our study is to analyze in detail the emission of gravitational waves in the collapsar scenario of long gamma-ray bursts. Our simulations show that the phase during which the proto-neutron star (PNS) survives before ultimately collapsing to a black hol…

Astrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics01 natural sciencesInstabilityGeneral Relativity and Quantum Cosmology0103 physical sciencesRadiative transferAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsSolar and Stellar Astrophysics (astro-ph.SR)Astrophysics::Galaxy AstrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)PhysicsEinstein Telescope010308 nuclear & particles physicsGravitational waveAstronomy and AstrophysicsVirgo ClusterBlack holeSupernovaNeutron starAstrophysics - Solar and Stellar Astrophysics13. Climate actionSpace and Planetary ScienceAstrophysics - High Energy Astrophysical PhenomenaThe Astrophysical Journal
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The imprints of the Great Attractor and the Virgo cluster on the microwave background

1993

A fully non-linear model based on the Tolman-Bondi solution of the Einstein equations is used to describe the Great Attractor and the Virgo cluster. The background is a Friedmann-Robertson-Walker universe, and the inhomogeneity develops from physically motivated initial profiles of the energy density and the peculiar velocity. Accurate numerical integrations of the field equations of the null geodesics are carried out, and thus the angular temperature distribution of the microwave background produced by the chosen overdensities is found. The observer is located in the Local Group. The quadrupole Q produced by each overdensity is computed and divided into two parts: the relativistic Doppler …

PhysicsCosmic microwave backgroundLocal GroupAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsVirgo ClusterCosmologyGeneral Relativity and Quantum Cosmologysymbols.namesakeGreat AttractorSpace and Planetary ScienceFriedmann–Lemaître–Robertson–Walker metricQuadrupolesymbolsPeculiar velocityMonthly Notices of the Royal Astronomical Society
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The orientations of galaxy groups and formation of the Local Supercluster

2009

We analysed the orientation of galaxy groups in the Local Supercluster (LSC). It is strongly correlated with the distribution of neighbouring groups in the scale till about 20 Mpc. The group major axis is in alignment with both the line joining the two brightest galaxies and the direction toward the centre of the LSC, i.e. Virgo cluster. These correlations suggest that two brightest galaxies were formed in filaments of matter directed towards the protosupercluster centre. Afterwards, the hierarchical clustering leads to aggregation of galaxies around these two galaxies. The groups are formed on the same or similarly oriented filaments. This picture is in agreement with the predictions of nu…

PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)Group (mathematics)Semi-major axisFOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsVirgo ClusterGalaxySpace and Planetary ScienceSuperclusterOrientation (geometry)Galaxy groupAstrophysics::Galaxy AstrophysicsAstrophysics - Cosmology and Nongalactic AstrophysicsLine (formation)
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