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Test of the Expanding Universe Postulate
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This article is published in The Astrophysical Journal.The article was published on 1972-01-01. It has received 29 citations till now. The article focuses on the topics: Big Rip & Metric expansion of space.read more
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Facts and ideas in modern cosmology
TL;DR: A review of the principles of observational testing of cosmological theories with a special emphasis on the distinction between observational facts and theoretical hypotheses is given in this paper, where the authors discuss the validity of the two basic assumptions of modern cosmology that are the Cosmological Principle and the Expanding Space Paradigm.
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The Tolman Surface Brightness Test for the Reality of the Expansion. I. Calibration of the Necessary Local Parameters
TL;DR: In this paper, the Tolman test is used to estimate the surface brightness of the first-ranked cluster galaxies at Petrosian η radii of 1.0, 1.3, 1.5, 1 7, 2.0 and 2.5 magnitudes.
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POLARIX: a pathfinder mission of X-ray polarimetry
Enrico Costa,Ronaldo Bellazzini,Gianpiero Tagliaferri,Giorgio Matt,A. Argan,Primo Attinà,Luca Baldini,Stefano Basso,Alessandro Brez,Oberto Citterio,Sergio Di Cosimo,Vincenzo Cotroneo,Sergio Fabiani,Marco Feroci,Antonella Ferri,Luca Latronico,Francesco Lazzarotto,Massimo Minuti,Ennio Morelli,Fabio Muleri,L. Nicolini,Giovanni Pareschi,Giuseppe Di Persio,Michele Pinchera,M. Razzano,Luigia Reboa,Alda Rubini,Antonio Maria Salonico,Carmelo Sgrò,Paolo Soffitta,Gloria Spandre,Daniele Spiga,Alessio Trois +32 more
TL;DR: The polarimetric response of a Gas Pixel Detector, combined with position sensitivity, results in a huge increase of sensitivity as discussed by the authors, which can provide additional information procuring two new observable quantities, the degree and the angle of polarization.
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The design and flight performance of the PoGOLite Pathfinder balloon-borne hard X-ray polarimeter
Maxime Chauvin,Hans-Gustav Florén,Miranda Jackson,T. Kamae,T. Kawano,Mózsi Kiss,Merlin Kole,Merlin Kole,Victor Mikhalev,E. Moretti,E. Moretti,Göran Olofsson,S. Rydström,Hiromitsu Takahashi,J. Lind,Jan-Erik Strömberg,O. Welin,A. F. Iyudin,D. Shifrin,Mark Pearce +19 more
TL;DR: The PoGOLite Pathfinder is a balloon-borne hard X-ray polarimeter operating in the 25-240 keV energy band from a stabilised observation platform.
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Astrophysical motivation for X-ray polarimetry
TL;DR: Polarization is a powerful tool to infer geometrical properties of sources which are too small to be spatially resolved as mentioned in this paper, and there has been recent progress in instrumentation which is likely to allow searches for X-ray polarization at levels significantly below what was possible for early detectors.