搜索结果: 1-13 共查到“天体物理学 Background”相关记录13条 . 查询时间(0.113 秒)
Observing the Big Bounce with Tensor Modes in the Cosmic Microwave Background: Phenomenology and Fundamental LQC Parameters
Quantum gravity quantum cosmology
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2010/11/12
Cosmological models where the standard Big Bang is replaced by a bounce have been studied for
decades. The situation has however dramatically changed in the last years for two reasons. First,because ...
The Gamma-Ray Background Constrains the Origins of the Radio and X-Ray Backgrounds
cosmic rays gamma rays diffuse background radio continuum galaxies X-rays
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2010/11/9
Cosmic ray protons generate γ-rays, neutrinos, and secondary electrons and positrons (e±) through pionproducing collisions with gas atoms. Any synchrotron or Inverse Compton (IC) radiation from second...
Instruments of RT-2 Experiment onboard CORONASPHOTON and their test and evaluation IV: Background Simulations using GEANT-4 Toolkit
Radiation detectors X- and gamma-ray telescopes and instrumentation
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2010/11/16
Hard X-ray detectors in space are prone to background signals due to the ubiquitous cosmic rays and cosmic diffuse background radiation that continuously bom-bards the satellites which carry the detec...
The impact of spatial fluctuations in the ultra-violet background on intergalactic carbon and silicon
methods: numerical intergalactic medium quasars absorption lines
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2010/11/12
Spatial inhomogeneities in the spectral shape of the ultra-violet background (UVB) at the tail-end of He II reionisation are thought to be the primary cause of the large fluctuations observed in the H...
On the Origins of the High-Latitude H-alpha Background
the High-Latitude H-alpha Background
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2011/1/10
The diffuse high-latitude H-alpha background is widely believed to be predominantly the result of in-situ recombination of ionized hydrogen in the warm interstellar medium of the Galaxy. Instead, we s...
f(T) gravity mimicking dynamical dark energy. Background and perturbation analysis
Cosmology and Extragalactic Astrophysics (astro-ph.CO) General Relativity and Quantum Cosmology (gr-qc) High Energy Physics - Theory (hep-th)
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2010/12/28
We investigate f(T) cosmology in both the background, as well as in the perturbation level, and we present the general formalism for reconstructing the equivalent one-parameter family of f(T) models f...
Local non-Gaussianity in the Cosmic Microwave Background the Bayesian way
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
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2010/12/27
We introduce an exact Bayesian approach to search for non-Gaussianity of local type in Cosmic Microwave Background (CMB) radiation data. Using simulated CMB temperature maps, the newly developed techn...
AKARI observation of the fluctuation of the near-infrared background. I
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
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2010/12/23
We sought to detect fluctuations of brightness in the sky toward the north ecliptic pole (NEP) with the Japanese infrared astronomical satellite AKARI, at 2.4, 3.2, and 4.1 {\mu}m. The obtained circul...
Effects of Residue Background Events in Direct Detection Experiments on Determining Properties of Halo Dark Matter
Effects Direct Detection Experiments Properties of Halo Dark Matter
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2010/11/12
We reexamine the model–independent data analysis methods for extracting properties of Weakly
InteractingMassive Particles (WIMPs) by using data (measured recoil energies) from direct Dark
Matter det...
Non-Gaussianity and the Cosmic Microwave Background Anisotropies
Non-Gaussianity Cosmic Microwave
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2010/3/19
We review in a pedagogical way the present status of the impact of non-Gaussianity (NG) on the Cosmic Microwave Background (CMB) anisotropies. We first show how to set the initial conditions at second...
The Cosmological Evolution of Blazars and the Extragalactic Gamma-Ray Background in the Fermi Era
Cosmological Evolution Blazars Extragalactic Gamma-Ray Background
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2010/3/8
The latest determination of the extragalactic gamma-ray background (EGRB) radiation by Fermi is compared with the theoretical prediction of the blazar component by Inoue & Totani (2009; hereafter IT09...
Spectral Analysis of the Background in Ground-based Long-slit Spectroscopy
Atmospheric effects planetary nebulae:general planetary nebulae:individual (HD 44179, NGC 2022, NGC 6309, NGC 6891)
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2009/5/12
This paper examines the variations, because of atmospheric
extinction, of broad-band visible spectra, obtained from long-slit spectroscopy,
in the vicinity of some stars, nebulae, and one faint gala...
Background of Gravitational Waves Generated by Astrophysical Sources
Gravitational Waves Astrophysical Sources
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2010/10/18
Background of Gravitational Waves Generated by Astrophysical Sources.