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5 results on '"Lohfink, M"'

4. Tracer diffusion in polymer and organic liquids close to the glass transition studied by forced rayleigh scattering.

Author

Kilian, H. G., Lagaly, G., Ewen, B., Fischer, E. W., Fytas, G., Lohfink, M., and Sillescu, H.

Abstract

Translational diffusion coefficients D of photochronic dye molecules have been measured by forced Rayleigh scattering in polymer diluent systems at compositions from pure polymer to pure diluent. D could be measured down to below the glass transition temperature Tg. In the pure diluent, D(Tg) was found typically about two decades below that in the pure polymer but still far above the Stokes-Einstein prediction extrapolated from high temperatures. Some experimental results are in contrast with predictions from free-volume theory. [ABSTRACT FROM AUTHOR]

Published
1993
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5. The NuSTAR X-ray spectrum of the low-luminosity active galactic nucleus in NGC 7213

Author

Dominic J. Walton, D. Stern, P. Arévalo, Christopher S. Reynolds, Giorgio Matt, Fiona A. Harrison, Franz E. Bauer, David R. Ballantyne, Anne M. Lohfink, A. C. Fabian, Andrea Marinucci, Francesco Ursini, Stefano Bianchi, A. Tortosa, Ursini, F., Marinucci, A, Matt, G, Bianchi, S, Tortosa, A, Stern, D, Arevalo, P, Ballantyne, R, Bauer, E, Fabian, C, Harrison, A, Lohfink, M, Reynolds, S, and Walton, D.

Subjects
Physics, Active galactic nucleus, Astrophysics::High Energy Astrophysical Phenomena, Continuum (design consultancy), Astronomy, Astronomy and Astrophysics, Torus, Astrophysics, Corona, Luminosity, Spherical geometry, Space and Planetary Science, Optical depth (astrophysics), Equivalent width
Abstract

We present an analysis of the 3–79 keV NuSTAR spectrum of the low-luminosity active galactic nucleus NGC 7213. In agreement with past observations, we find a lower limit to the high-energy cut-off of E_c > 140 keV, no evidence for a Compton-reflected continuum and the presence of an iron K α complex, possibly produced in the broad-line region. From the application of the MYTORUS model, we find that the line-emitting material is consistent with the absence of a significant Compton reflection if arising from a Compton-thin torus of gas with a column density of 5.0^(+2.0)_(−1.6) × 10^(23) cm^(−2). We report variability of the equivalent width of the iron lines on the time-scale of years using archival observations from XMM–Newton, Chandra and Suzaku. This analysis suggests a possible contribution from dusty gas. A fit with a Comptonization model indicates the presence of a hot corona with a temperature kT_e > 40 keV and an optical depth τ ≲ 1, assuming a spherical geometry.

Published
2015

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