搜索结果: 1-15 共查到“知识库 射电天体物理学”相关记录28条 . 查询时间(5.583 秒)
F-GAMMA: On the phenomenological classification of continuum radio spectra variability patterns of Fermi blazars
F-GAMMA phenomenological classification continuum radio spectra variability patterns Fermi blazars
2012/2/21
The F-GAMMA program is a coordinated effort to investigate the physics of Active Galactic Nuclei (AGNs) via multi-frequency monitoring of Fermi blazars. In the current study we show and discuss the ev...
The contribution from blazar cascade emission to the extragalactic gamma-ray background: What a role does the extragalactic magnetic field play?
diffuse radiation galaxies active gamma rays general
2012/2/21
We estimate the contribution to the extragalactic gamma-ray background (EGRB) from both intrinsic and cascade emissions produced by blazars using a simple semi- analysis method for two models of the b...
Explaining radio emission of magnetars via rotating and oscillating magnetospheres of neutron stars
MHD: pulsars — general — relativity — oscillations — magnetar — stars:neutron — death line — plasma magnetosphere
2011/10/10
We investigate the conditions for radio emission in rotating and oscillating magnetars, by focusing on the main physical processes determining the position of their death-lines in the P-\dot{P} diagra...
Supernova 2000cb: high-energy version of SN 1987A
supernovae: general – supernovae: individual: SN 2000cb
2011/10/8
Among type IIP supernovae there are a few events that resemble the well-studied supernova 1987A produced by the blue supergiant in the Large Magellanic Cloud. We study a peculiar supernova 2000cb and ...
Extreme Emission Line Galaxies in CANDELS: Broad-Band Selected, Star-Bursting Dwarf Galaxies at z>1
Extreme Emission Galaxies CANDELS: Broad-Band Selected Star-Bursting Dwarf Galaxies
2011/10/17
We identify an abundant population of extreme emission line galaxies (EELGs) at redshift z~1.7 in the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS) imaging from Hubble Space Teles...
The Nature and Cause of Spectral Variability in LMC X-1
Nature Cause Spectral Variability LMC X-1
2011/10/21
We present the results of a long-term observation campaign of the extragalactic wind-accreting black-hole X-ray binary LMC X-1, using the Proportional Counter Array on the Rossi X-Ray Timing Explorer ...
Implications for the structure of the relativistic jet from multiwavelength observations of NGC 6251
γ-rays: galaxies —galaxies: active — galaxies: jets— galaxies: individual: NGC 6251
2011/10/13
NGC 6251 is a luminous radio galaxy ~104 Mpc away that was detected significantly with the Fermi Gamma-ray Space Telescope, and before that with EGRET (onboard the Compton Gamma-ray Observatory). Diff...
The Track Imaging Cerenkov Experiment
Cosmic-ray telescope, Multi-anode Photomultiplier Tube, Imaging Atmospheric Cerenkov Technique
2011/10/10
We describe a dedicated cosmic-ray telescope that explores a new method for detecting Cerenkov radiation from high-energy primary cosmic rays and the large particle air shower they induce upon enterin...
Effect of Dust on Lyman-alpha Photon Transfer in Optically Thick Halo
Effect Photon Transfe Optically Thick
2011/9/30
We investigate the effects of dust on Ly{\alpha} photons emergent from an optically thick medium by solving the integro-differential equation of the radiative transfer of resonant photons. To solve th...
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...
Evolution of the Solar Nebula. IX. Gradients in the Spatial Heterogeneity of the Short-Lived Radioisotopes $^{60}$Fe and $^{26}$Al and the Stable Oxygen Isotopes
Evolution Solar Nebula IX. Gradients Spatial Heterogeneity Short-Lived Stable Oxygen Isotopes
2011/9/27
Short-lived radioisotopes (SLRI) such as $^{60}$Fe and $^{26}$Al were likely injected into the solar nebula in a spatially and temporally heterogeneous manner. Marginally gravitationally unstable (MGU...
Unveiling the nature of IGR J17177-3656 with X-ray, NIR and Radio observations
Unveiling IGR J17177-3656 X-ray NIR Radio observations
2011/9/26
We report on the first broad-band (1-200 keV) simultaneous Chandra-INTEGRAL observations of the recently discovered hard X-ray transient IGR J17177-3656 that took place on 2011, March 22, about two we...
VLBI imaging of a flare in the Crab Nebula: More than just a spot
ISM:supernova remnants —radio continuum:stars— pulsars:general —pulsars:individual:Crab pulsar
2011/9/26
We report on very long baseline interferometry (VLBI) observations of the radio emission from the inner region of the Crab Nebula, made at 1.6 GHz and 5 GHz after a recent high-energy flare in this ob...
Varying disc-magnetosphere coupling as the origin of pulse profile variability in SAX J1808.4-3658
accretion accretion discs – pulsars:individual:SAX J1808.4–3658 – stars:neu-tron – X-rays:binaries
2011/9/26
Accreting millisecond pulsars show significant variability of their pulse profiles, especially at low accretion rates. On the other hand, their X-ray spectra are remarkably similar with not much varia...
Electron Temperatures in W51 Complex from High Resolution, Low Frequency Radio Observations
ISM—HII regions—radio continuum—individual (W51)
2010/9/15
W51 is a giant radio complex lying along the tangent to the Sagitarius arm at a distance of about 7 kpc from the Sun, with an extension of about 1◦ in the sky. It is divided into three component...