搜索结果: 31-45 共查到“知识库 恒星物理学”相关记录279条 . 查询时间(6.114 秒)
Galaxy Structure and Mode of Star Formation in the SFR-Mass Plane from z ~ 2.5 to z ~ 0.1
Galaxy Structure Star Formation SFR-Mass Plane
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2011/9/27
We analyze the dependence of galaxy structure (size and Sersic index) and mode of star formation (\Sigma_SFR and SFR_IR/SFR_UV) on the position of galaxies in the SFR versus Mass diagram. Our sample c...
SuperWASP observations of pulsating Am stars
Asteroseismology – Stars:chemically peculiar – Stars:oscillations – Stars:variables:delta Scuti – Techniques:photom- etry
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2011/9/27
We have studied over 1600 Am stars at a photometric precision of 1 mmag with SuperWASP photometric data. Contrary to previous belief, we find that around 200 Am stars are pulsating delta Sct and gamma...
Dissecting high-mass star-forming regions; tracing back their complex formation history
high-mass star-forming regions tracing complex formation
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2011/9/26
We present near-infrared JHKs imaging as well as K-band multi-object spectroscopy of the massive stellar content of W3 Main using LUCI at the LBT. We confirm 13 OB stars by their absorption line spect...
High Lundquist Number Resistive MHD Simulations of Magnetic Reconnection: Searching for Secondary Island Formation
Lundquist Number Resistive MHD Simulations Magnetic Reconnection
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2011/9/9
Recently, secondary island formation due to the tearing instability of the Sweet-Parker current sheet was identified as a possible mechanism that can lead to fast reconnection (less sensitive dependen...
The Effect of Magnetic Turbulence Energy Spectra and Pickup Ions on the Heating of the Solar Wind
Pickup ions, Solar wind heating, MHD turbulence, Wave-particle interaction
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2011/9/9
In recent years, a phenomenological solar wind heating model based on a turbulent energy cascade prescribed by the Kolmogorov theory has produced reasonably good agreement with observations on proton ...
Kolmogorov versus Iroshnikov-Kraichnan spectra: Consequences for ion heating in the solar wind
Kolmogorov Iroshnikov-Kraichnan spectra the solar wind
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2011/9/9
Whether the phenomenology governing MHD turbulence is Kolmogorov or Iroshnikov-Kraichnan (IK) remains an open question, theoretically as well as observationally. The ion heating profile observed in th...
Fourth-order gravity as the inflationary model revisited
Fourth-order gravity inflationary model
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2010/3/19
We revisit the simplest (fourth-order or quadratically generated) modified gravity model in four space-time dimensions. It is equivalent to the certain quintessence model via a Legendre-Weyl transform...
Area spectra of the rotating BTZ black hole from quasinormal modes
black hole quasinormal modes discrete spectrum
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2010/3/19
Following Bekenstein's suggestion that the horizon area of a black hole should be quantized, the discrete spectrum of the horizon area has been investigated in various ways. By considering the quasino...
Ghost anomalous dimension in asymptotically safe quantum gravity
ghost anomalous dimension quantum gravity
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2010/3/22
We compute the ghost anomalous dimension within the asymptotic-safety scenario for quantum gravity. For a class of covariant gauge fixings and using a functional RG scheme, the anomalous dimension $\e...
Ghost Dark Matter
Dark Energy Dark Matter Modified Gravity
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2010/3/19
We revisit ghost dark matter, the possibility that ghost condensation may serve as an alternative to dark matter. In particular, we investigate the Friedmann-Robertson-Walker (FRW) background evolutio...
An instability of higher-dimensional rotating black holes
higher-dimensional black holes
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2010/3/19
We present the first example of a linearized gravitational instability of an asymptotically flat vacuum black hole. We study perturbations of a Myers-Perry black hole with equal angular momenta in an ...
Alternatives to dark matter: Modified gravity as an alternative to dark matter
dark matter Modified gravity
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2010/3/19
The premier alternative to the dark matter paradigm is modified gravity. Following an introduction to the relevant phenomenology of galaxies, I review the MOND paradigm, an effective summary of the ob...
Gravitational waves and pulsar timing: stochastic background, individual sources and parameter estimation
Gravitational waves pulsar timing Square Kilometre Array
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2010/3/19
Massive black holes are key ingredients of the assembly and evolution of cosmic structures. Pulsar Timing Arrays (PTAs) currently provide the only means to observe gravitational radiation from massive...
Microlensing as a probe of the Galactic structure; 20 years of microlensing optical depth studies
microlensing dark matter Galactic structure
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2010/3/19
Microlensing is now a very popular observational astronomical technique. The investigations accessible through this effect range from the dark matter problem to the search for extra-solar planets. In ...
Unraveling Binary Evolution from Gravitational-Wave Signals and Source Statistics
Gravitational Waves Binary Evolution Neutron Stars Black Holes
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2010/3/19
The next generation of ground-based gravitational-wave detectors are likely to observe gravitational waves from the coalescences of compact-objects binaries. We describe the state of the art for predi...