搜索结果: 1-15 共查到“天文学 modelling”相关记录29条 . 查询时间(0.221 秒)
Joint spectral-timing modelling of the hard lags in GX 339-4: constraints on reflection models
Joint spectral-timing modelling the hard lags GX 339-4 constraints reflection models
2012/2/23
The X-ray variations of hard state black hole X-ray binaries above 2 keV show 'hard lags', in that the variations at harder energies follow variations at softer energies, with a time-lag \tau dependin...
Modelling supermassive black hole growth: towards an improved sub-grid prescription
Modelling supermassive black hole growth sub-grid prescription
2012/2/24
Accretion onto supermassive black holes (SMBHs) in galaxy formation simulations is frequently modelled by the Bondi-Hoyle formalism. Here we examine the validity of this approach analytically and nume...
Modelling neutral hydrogen in galaxies using cosmological hydrodynamical simulations
galaxies: evolution: general ?galaxies: luminosity function, mass func-tion ?dark matter ?radio lines: galaxies ?methods: N-body simulations
2011/10/11
The characterisation of the atomic and molecular hydrogen content of high-redshift galaxies is a major observational challenge that will be addressed over the coming years with a new generation of rad...
Oscillations of relativistic axisymmetric tori and implications for modelling kHz-QPOs in neutron-star X-ray binaries
X-rays: binaries – relativity – stars: neutron
2011/10/8
We perform a global linear perturbative analysis, and investigate the oscillation properties of relativistic, non-selfgravitating tori orbiting around neutron stars in the slow rotation limit approxim...
Modelling pulsar glitches with realistic pinning forces: a hydrodynamical approach
Modelling pulsar glitches realistic pinning forces hydrodynamical approach
2011/10/17
Although pulsars are one of the most stable clocks in the universe, many of them are observed to 'glitch', i.e. to suddenly increase their spin frequency (\nu) with fractional increases that range fro...
Modelling interaction of relativistic and non-relativistic winds in binary system PSR B1259-63/SS2883 - II. Impact of magnetization and anisotropy of the pulsar wind
HD – shock waves - pulsars: binaries
2011/10/19
In this paper, we present a numerical study of the properties of the flow produced by the collision of a magnetized anisotropic pulsar wind with its environment in binary system. We compare the impact...
The ATLAS3D Project-- VIII: Modelling the Formation and Evolution of Fast and Slow Rotator Early-Type Galaxies within $Λ$CDM
galaxies elliptical and lenticular cD – galaxies formation – galaxies evolution – galaxies structure
2011/10/21
We propose a simple model for the origin of fast and slow rotator early-type galaxies (ETG) within the hierarchical $\Lambda$CDM scenario, that is based on the assumption that the mass fraction of ste...
Multi-Wavelength Modelling of the Beta Leo Debris Disc: 1, 2 or 3 planetesimal populations?
Multi-Wavelength Modelling Beta Leo Debris Disc planetesimal populations
2011/9/27
In this paper we present a model of the Beta Leo debris disc, with an emphasis on modelling the resolved PACS images obtained as part of the Herschel key programme DEBRIS. We also present new SPIRE im...
Modelling of the Complex CASSOWARY/SLUGS Gravitational Lenses
the Complex CASSOWARY/SLUGS Gravitational Lenses Cosmology
2011/1/11
We present the first high-resolution images of CSWA 31, a gravitational lens system observed as part of the SLUGS (Sloan Lenses Unravelled by Gemini Studies) program. These systems exhibit complex ima...
Modelling the dusty universe II: The clustering of submillimetre-selected galaxies
galaxies:high-redshift – galaxies-evolution – cosmology large scale struc-ture – submillimetre – methods N-body simulations
2010/11/12
We combine the galform semi-analytical model of galaxy formation, which predicts the star formation and merger histories of galaxies, the grasil spectro-photometric code, which calculates the spectral...
Modelling the spectral energy distribution of galaxies. V. The dust and PAH emission SEDs of disk galaxies
Radiative transfer - Scattering - (ISM): dust extinction - Galaxies spiral - Galaxies: individual
2010/11/15
We present a self-consistent model of the spectral energy distributions (SEDs) of spiral galaxies from the ultraviolet (UV) to the mid-infrared (MIR)/far-infrared (FIR)/submillimeter (submm) based on ...
Spiralling out of control: 3D hydrodynamical modelling of the colliding winds in $\eta\thinspace$Carinae
hydrodynamics stars:early-type X-rays stars - stars binaries - stars:winds
2010/11/10
Three dimensional (3D) adaptive-mesh refinement (AMR) hydrodynamical simulations of the windwind collision between the enigmatic super-massive star η Car and its mysterious companion star are presente...
Modelling chromospheric line profiles as diagnostics of velocity fields in ω Centauri red giant stars
line profiles globular clusters individual atmospheres mass loss
2010/11/11
Context. Mass loss of ∼ 0.1-0.3 M⊙ from Population II red giant stars (RGB) is a requirement of stellar evolution theory in order to account for several observational evidences in globular clust...
Reaction Networks For Interstellar Chemical Modelling: Improvements and Challenges
Reaction Networks Interstellar Chemical Modelling
2010/11/11
We survey the current situation regarding chemical modelling of the synthesis of molecules in the interstellar medium. The present state of knowledge concerning the rate coecients and their uncertain...
The stellar evolution of Luminous Red Galaxies, and its dependence on colour, redshift, luminosity and modelling
galaxies evolution - cosmology observations - surveys
2010/11/15
We present a series of colour evolution models for Luminous Red Galaxies (LRGs) in the 7th spectroscopic data release of the Sloan Digital Sky Survey (SDSS), computed using the full-spectrum fitting c...