Results 131 to 140 of about 658,780 (159)

RadioAstron observations of pulsars and interstellar scattering

2014 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM), 2014
We describe RadioAstron observations directed to understand interstellar scattering by studies of pulsars. The RadioAstron project is an international collaborative mission involving a free-flying satellite, Spektr-R, carrying a 10-m space radio telescope on an elliptical orbit around the Earth.
C.R. Gwinn, M.V. Popov, T.V. Smirnova, V.I. Shishov, J.M. Anderson, A.S. Andrianov, N. Bartel, S. Buchner, A. Deller, W. Hankey, S. Horiuchi, M.D. Johnson, B.C. Joshi, N.S. Kardashev, R. Karuppusamy, M. Kramer, J. McCallum, C. Phillips, J. Quick, J. Reynolds, A. Rudnitsky, E. Safutdinov, V. Soglasnov, A. Tzioumis, J.A. Zensus, V. Zhuravlev   +25 more
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Scattering by interstellar graphite dust analog

Journal of Quantitative Spectroscopy and Radiative Transfer, 2014
Abstract The analysis of optical scattering data of interstellar carbonaceous graphite dust analog at 543.5 nm, 594.5 nm and 632.8 nm laser wavelengths by using an original laboratory light scattering setup is presented. The setup primarily consisted of a laser source, optical units, aerosol sprayer, data acquisition system and associated ...
Gazi A. Ahmed, Ankur Gogoi
openaire   +1 more source

Interstellar scattering of maser radiation

1993
Interstellax scattering of pulsars, extragalactic sources, and galactic masers is used to discuss the overall galactic distribution of scattering material and the implied angular scattering vs galactic coordinates. I discuss the prospects for observing diffractive and refractive scintillations of maser signals.
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Interstellar Scattering and Scintillation of Radio Waves

Annual Review of Astronomy and Astrophysics, 1977
A review is presented of interstellar scattering and scintillation observations in the light of modern theory for extended, spatially homogeneous, power law inhomogenieties. Formulas are presented for the experimentally observable quantities and are compared with data. A general discussion of the model is given. (GHT)
exaly   +2 more sources

X-Ray Scattering on the Interstellar Dust

Astrophysics and Space Science, 1997
The interaction of X-rays with interstellar dust leads to small angle scattering. X-ray sources behind sufficiently dense dust columns are therefore surrounded by haloes of faint and diffuse X-ray emission. Since these X-ray sources are also highly absorbed, X-ray observations offer the unique opportunity to measure both components of interstellar ...
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Scattering and Absorption of X-rays by Interstellar Dust

2004
In dieser Arbeit habe ich die Eigenschaften der interstellaren Staubpartikel untersucht, wie sie sich aus deren Wechselwirkung mit Roentgen strahlung ergeben. Tatsaechlich werden Photonen, die von einer entfernten Punktquelle stammen, von den Staubteilchen nicht nur absorbiert sondern auch in Vorwaertsrichtung gestreut.
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Astrophysical Applications of Scattering in Interstellar and Intracluster Gases

2004
Diese Arbeit befasst sich mit astrophysikalischen Anwendungen von Streuprozessen in diffusen Gasen innerhalb von Galaxien bzw. Galaxienhaufen. Anhand von aktuellen Beobachtungsdaten wird versucht, Aussagen über die zurückliegende Entwicklung der Leuchtkraft von astrophysikalischen Objekten, wie supermassiven schwarzen Löchern und relativistischen Jets,
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Observations and Levy statistics in interstellar scattering

Astronomical & Astrophysical Transactions, 2007
Levy flights are similar to random walks, but are dominated by rare, large events rather than the accumulation of many steps. Levy flights are not subject to the Central Limit Theorem because the distribution of steps has no second moment; they converge to Levy-stable distributions, which have power-law tails and are stable in form under convolution ...
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Interstellar scattering near the galactic center

Astronomy Reports, 2015
A previously obtained dependence of the scattering angles of extragalactic radio sources on the background emissionmeasure toward the sources is used together with data on the background brightness temperature near the Galactic center at 43 and 10 GHz to calculate the scattering angles of compact extragalactic radio sources as a function of their ...
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Interstellar Scintillation and Scattering

2022
openaire   +1 more source