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Astronomers capture first image of a black hole（图）
Astronomer capture first image black hole
2019/11/22
Update: The members of the Event Horizon Telescope Collaboration were awarded the Breakthrough Prize in Fundamental Physics on Sept. 5, 2019. The Breakthrough Prize annually recognizes achievements in...
There are 450 light-years between Earth and LkCa15, a young star with a transition disk around it, a cosmic whirling dervish, a birthplace for planets.
Despite the disk’s considerable distance from E...
ON THE SOLAR-CYCLE MODULATION OF THE HOMESTAKE SOLAR NEUTRINO CAPTURE RATE AND THE SHUFFLE TEST
SOLAR-CYCLE MODULATION SHUFFLE TEST
2015/8/20
There exists no signiDcant correlation between the Homestake neutrino data up to run 133 and the
monthly sunspot number, according to a test that is based on certain optimality properties for this ty...
The Electron Capture Decay of 163-Ho to Measure the Electron Neutrino Mass with sub-eV Accuracy and Beyond
electron neutrino mass electron capture decay 163Ho
2012/2/24
We have investigated the possibility of measuring the electron neutrino mass with sub-eV sensitivity by studying the electron capture decay of 163-Ho with cryogenic microcalorimeters. In this paper we...
Atomic data for neutron-capture elements II. Photoionization and recombination properties of low-charge krypton ions
atomic data - atomic processes - HII regions - nucleosynthesis, abundances - planetary nebulae: general - stars:evolution
2011/10/12
We present multi-configuration Breit-Pauli distorted-wave photoionization (PI) cross sections and radiative recombination (RR) and dielectronic recombination (DR) rate coefficients for the first six k...
Study of isotopic fractions and abundances of the neutron-capture elements in HD 175305
isotopic fractions the neutron-capture elements
2011/1/10
The chemical abundances of metal-poor stars are excellent sources of information for setting new constraints on models of Galactic chemical evolution at low metallicities. In this paper we present an ...
Effects of Turbulence, Eccentricity Damping, and Migration Rate on the Capture of Planets into Mean Motion Resonance
planetary systems planetary systems formation — planets and satellites formation — turbulence
2010/11/11
Pairs of migrating extrasolar planets often lock into mean motion resonance as they drift inward. This paper studies the convergent migration of giant planets (driven by a circumstellar disk) and dete...
A past capture event at Sagittarius A* inferred from the fluorescent X-ray emission of Sagittarius B clouds
High Energy Astrophysical Phenomena (astro-ph.HE) Galaxy Astrophysics (astro-ph.GA)
2010/12/27
The fluorescent X-ray emission from neutral iron in the molecular clouds (Sgr B) indicates that the clouds are being irradiated by an external X-ray source. The source is probably associated with the ...
Lithium and proton-capture elements in Globular Cluster dwarfs: the case of 47 Tuc
Stars abundances Stars Individual Population II- (Galaxy:) globular clusters
2010/3/9
Previous surveys in a few metal-poor Globular Clusters (GCs) showed that the determination of abundances for Li and proton-capture elements offers a key tool to address the intra-cluster pollution sce...
Rapid Neutron Capture Process in Supernovae and Chemical Element Formation
Supernova—nucleosynthesis—abundance—r-process
2010/9/15
The rapid neutron capture process (r-process) is one of the major nucleosynthesis processes responsible for the synthesis of heavy nuclei beyond iron. Isotopes beyond Fe are most exclusively formed in...
Mass-capture rate by the neutron star in be/x-ray Binaries
Mass-capture rate neutron star be/x-ray Binaries
2009/6/17
Mass-capture rate by the neutron star in be/x-ray Binaries。
UV Observations of Neutron Capture Elements in Planetary Nebulae
UV Observations Planetary Nebulae Neutron Capture Elements
2009/6/9
UV Observations of Neutron Capture Elements in Planetary Nebulae。