7,134 research outputs found
Supernova Remnants and Plerions in the Compton Gamma-Ray Observatory Era
Due to observations made by the Compton Gamma-Ray Observatory over the last
six years, it appears that a number of galactic supernova remnants may be
candidates for sources of cosmic gamma-rays. These include shell-type remnants
such as IC443 and Cygni, which have no known parent pulsars, but have
significant associations with unidentified EGRET sources, and others that
appear to be composite, where a pulsar is embedded in a shell (e.g. W44 and
Vela), or are purely pulsar-driven, such as the Crab Nebula. This review
discusses our present understanding of gamma-ray production in plerionic and
non-plerionic supernova remnants, and explores the relationship between such
emission and that in other wavebands. Focuses include models of the Crab and
Vela nebulae, the composite nature of W44, the relationship of shell-type
remnants to cosmic ray production, the relative importance of shock-accelerated
protons and electrons, constraints on models placed by TeV, X-ray and radio
observations, and the role of electrons injected directly into the remnants by
parent pulsars.Comment: 21 pages, including 4 eps figures, invited review, to appear in Proc.
4th Compton Symposium, (1997) ed. Dermer, C. D. & Kurfess, J. D. (AIP, New
York
Next-to-leading order QCD corrections to W+Z and W-Z production via vector-boson fusion
We present the calculation of the next-to-leading order QCD corrections to
electroweak p p -> e+ nu_e mu+ mu- jj and p p -> e- nubar_e mu+ mu- jj
production at the CERN LHC in the form of a fully flexible parton-level Monte
Carlo program. The QCD corrections to the total cross sections are modest,
changing the leading-order results by less than 10%. At the Born level, the
shape of kinematic distributions can depend significantly on the choice of
factorization scale. This theoretical uncertainty is strongly reduced by the
inclusion of the next-to-leading order QCD corrections.Comment: 15 pages, 6 figures; new figure and comments added; version published
by PR
Flavor decomposition of the elastic nucleon electromagnetic form factors
The u- and d-quark contributions to the elastic nucleon electromagnetic form
factors have been determined using experimental data on GEn, GMn, GpE, and GpM.
Such a flavor separation of the form factors became possible up to 3.4 GeV2
with recent data on GEn from Hall A at JLab. At a negative four-momentum
transfer squared Q2 above 1 GeV2, for both the u- and d-quark components, the
ratio of the Pauli form factor to the Dirac form factor, F2/F1, was found to be
almost constant, and for each of F2 and F1 individually, the d-quark portions
of both form factors drop continuously with increasing Q2.Comment: 4 pages, 3 figure
Do methanethiol adsorbates on the Au(111) surface dissociate?
The interaction of methanethiol molecules CHSH with the Au(111) surface
is investigated, and it is found for the first time that the S-H bond remains
intact when the methanethiol molecules are adsorbed on the regular Au(111)
surface. However, it breaks if defects are present in the Au(111) surface. At
low coverage, the fcc region is favored for S atom adsorption, but at saturated
coverage the adsorption energies at various sites are almost iso-energetic. The
presented calculations show that a methanethiol layer on the regular Au(111)
surface does not dimerize.Comment: 4 pages, 2 figures, 4 tables, submitted to Phys. Rev. Let
Periodic Modulations in an X-ray Flare from Sagittarius A*
We present the highly significant detection of a quasi-periodic flux
modulation with a period of 22.2 min seen in the X-ray data of the Sgr A* flare
of 2004 August 31. This flaring event, which lasted a total of about three
hours, was detected simultaneously by EPIC on XMM-Newton and the NICMOS
near-infrared camera on the HST. Given the inherent difficulty in, and the lack
of readily available methods for quantifying the probability of a periodic
signal detected over only several cycles in a data set where red noise can be
important, we developed a general method for quantifying the likelihood that
such a modulation is indeed intrinsic to the source and does not arise from
background fluctuations. We here describe this Monte Carlo based method, and
discuss the results obtained by its application to a other XMM-Newton data
sets. Under the simplest hypothesis that we witnessed a transient event that
evolved, peaked and decayed near the marginally stable orbit of the
supermassive black hole, this result implies that for a mass of 3.5 x 10^{6}
Msun, the central object must have an angular momentum corresponding to a spin
parameter of a=0.22.Comment: 4 pages, 6 figures, submitted to ApJ
The Inhomogeneous Wind of the LBV Candidate CygOB2-No.12
We present the results of high-resolution spectroscopy of the extremely
luminous star CygOB2-No.12. We identified about 200 spectral features in the
range 4552-7939 AA, including the interstellar NaI, KI lines and numerous very
strong DIBs, along with the HeI, CII, and SiII lines. An MK spectral type we
derived for the object is B4.5Ia+. Our analysis of the radial velocity data
shows the presence of a gradient in the stellar atmosphere, caused by both
atmospheric expansion and matter infall onto the star. The Halpha emission
displays broad Thompson wings, a slightly blue-shifted PCyg type absorption
component and a time-variable core absorption. We conclude that the wind is
variable in time.Comment: 3 pages, 2 figures, IAU Symposium No.272 "Active OB stars: structure,
evolution, mass loss and critical limits", 201
Implementation Strategy Report
In essence the Implementation Strategy provides a plan for implementing and maintaining an optimal South African Water Resources Monitoring Network. As such the Strategy includes a number of key aspects considered for each of the surface water, groundwater and water quality monitoring programs, as summarized below:
Finalizing the optimal monitoring network design, including the location, the variables/constituents being monitored, the frequency of observations, as well as the implementation priority for each monitoring site.
Identifying opportunities for the integration of processes involved in the implementation process, such as the coordinated development or upgrading of monitoring sites based on physical location and other practical considerations.
Developing preliminary implementation, operation and maintenance cost estimates for each monitoring site.
Developing the sequencing,grouping and programming of the relevant implementation steps for monitoring sites within each monitoring program.
Developing preliminary implementation timelines and cash flow estimates, both provided per site, monitoring program, defined implementation area (such as a Water Management Area, WMA) and for the National Network.
Providing recommendations and the action list for achieving Strategy implementation
Identifying Strategy implementation risks and possible mitigation strategies, including the need for Strategy implementation support
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