Galaxy–galaxy weak lensing in the Sloan Digital Sky Survey: intrinsic alignments and shear calibration errors     

Christopher M. Hirata  Rachel Mandelbaum  Uro&#; Seljak  Jacek Guzik  Nikhil Padmanabhan  Cullen Blake  Jonathan Brinkmann  Tamas Budávari  rew Connolly  Istvan Csabai  Ryan Scranton  Alexander S. Szalay 《Monthly notices of the Royal Astronomical Society》2004,353(2):529-549

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Observations of GRS 1915+105 from the USA Experiment on ARGOS     

Reba M. Bandyopadhyay  K.S. Wood  P. Hertz  M.N. Lovellette  P.S. Ray  M.T. Wolff  B. Giebels  E.D. Bloom 《Astrophysics and Space Science》2001,276(1):23-24

We present first results from a monitoring campaign of GRS 1915+105 undertaken with the USA X-ray timing experiment on the ARGOS satellite. A variety of behaviour has been observed, ranging from low, steady X-ray emission to rapid quasi-periodic flaring on timescales of approximately 10–120 seconds.  相似文献   

The asteroseismological potential of the pulsating DB white dwarf stars CBS 114 and PG 1456+103     

G. Handler  T. S. Metcalfe  M. A. Wood 《Monthly notices of the Royal Astronomical Society》2002,335(3):698-706

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Eclipsing binary system R Canis Majoris     

E Budding  K-Y Chen  G Hudson  R Hudson  M Thomas  F B Wood 《Experimental Astronomy》1994,5(1-2):189-194

Problems raised by R CMa are revisited. The theoretical significance of observable period changes is noted. Some recent observations are presented and briefly considered against this background.  相似文献   

Parametric determination of the inclination of Keplerian circumstellar discs from spectropolarimetric profiles of scattered lines     

Kenneth Wood 《Astrophysics and Space Science》1994,216(1-2):95-97

Polarimetric line profiles arising from the Doppler redistribution of monochromatic stellar line radiation, Thomson scattered in a Keplerian rotating circumstellar disc are presented. It is shown that analysis of the scattered line profiles at different wavelengths which, due to Doppler redistribution, sample different disc regions allows the disc inclination to be determined.  相似文献   

Dissecting a galaxy: mass distribution of 2237+0305     

Cathryn M. Trott  Rachel L. Webster 《Monthly notices of the Royal Astronomical Society》2002,334(3):621-630

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Cosmology from 3 years of WMAP CMB data     

Rachel Bean   《New Astronomy Reviews》2006,50(11-12):850

The combined 3 year observations from the Wilkinson Microwave Anisotropy Probe (WMAP) have yielded full-sky temperature and polarization maps in five frequency bands (K, Ka, Q, V, W) between 23 and 94 GHz. In this article we discuss the cosmological implications of these observations. The combination of temperature and polarization data leads to a significant improvement in the measurement of the reionization optical depth τ = 0.093 ± 0.029. This, in turn, breaks a number of key degeneracies present in the constraints from temperature measurements alone allowing the WMAP CMB data on its own to offer a powerful insight into the universe’s constituents and the processes that generated the initial conditions for structure formation.  相似文献   

Persistent Near-Surface Flow Structures from Local Helioseismology     

Rachel Howe  R. W. Komm  D. Baker  L. Harra  L. van Driel-Gesztelyi  R. S. Bogart 《Solar physics》2015,290(11):3137-3149

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An experimental study of partial melting and fractional crystallization on the HED parent body          下载免费PDF全文

Helen O. Ashcroft  Bernard J. Wood 《Meteoritics & planetary science》2015,50(11):1912-1924

We have performed an experimental and modeling study of the partial melting behavior of the HED parent body and of the fractional crystallization of liquids derived from its mantle. We estimated the mantle composition by assuming chondritic ratios of refractory lithophile elements, adjusting the Mg# and core size to match the density and moment of inertia of Vesta, and the compositions of Mg‐rich olivines found in diogenites. The liquidus of a mantle with Mg# (=100*[Mg/(Mg+Fe)]) 80 is ~1625 °C and, under equilibrium conditions, the melt crystallizes olivine alone until it is joined by orthopyroxene at 1350 °C. We synthesized the melt from our 1350 °C experiment and simulated its fractional crystallization path. Orthopyroxene crystallizes until it is replaced by pigeonite at 1200 °C. Liquids become eucritic and crystal assemblages resemble diogenites below 1250 °C. MELTS correctly predicts the olivine liquidus but overestimates the orthopyroxene liquidus by ~70 °C. Predicted melt compositions are in reasonable agreement with those generated experimentally. We used MELTS to determine that the range of mantle compositions that can produce eucritic liquids and diogenitic solids in a magma ocean model is Mg# 75–80 (with chondritic ratios of refractory elements). A mantle with Mg# ~ 70 can produce eucrites and diogenites through sequential partial melting.  相似文献   

Governing geoengineering research: why, when and how?     

Lisa Dilling  Rachel Hauser 《Climatic change》2013,121(3):553-565

Research on geoengineering – deliberate management of the Earth’s climate system – is being increasingly discussed within the science and policy communities. While justified as necessary in order to expand the range of options available to policy makers in the future, geoengineering research has already engendered public controversy. Proposed projects have been protested or cancelled, and calls for a governance framework abound. In this paper, we consider the reasons why geoengineering research might be subject to additional governance and suggest mechanisms that might be usefully applied in developing such a framework. We consider criteria for governance as raised by a review of the growing literature on geoengineering and other controversial scientific topics. We suggest three families of concern that any governance research framework must respond to: the direct physical risks of the research; the transparency and responsibility in decision making for the research; and the larger societal meanings of the research. We review what mechanisms might be available to respond to these three families of concern, and consider how these might apply to geoengineering research.  相似文献