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Full-Text Articles in Physics
Accuracy Of The Thin-Lens Approximation In Strong Lensing By Smoothly Truncated Dark Matter Haloes, S. Frittelli, Thomas Kling
Accuracy Of The Thin-Lens Approximation In Strong Lensing By Smoothly Truncated Dark Matter Haloes, S. Frittelli, Thomas Kling
Physics Faculty Publications
The accuracy of mass estimates by gravitational lensing using the thin-lens approximation applied to Navarro–Frenk–White mass models with a soft truncation mechanism recently proposed by Baltz, Marshall and Oguri is studied. The gravitational lens scenario considered is the case of the inference of lens mass from the observation of Einstein rings (strong lensing). It is found that the mass error incurred by the simplifying assumption of thin lenses is below 0.5 per cent. As a byproduct, the optimal tidal radius of the soft truncation mechanism is found to be at most 10 times the virial radius of the mass model.
Demonstrating The Principles Of Aperture Synthesis With The Very Small Radio Telescope, Jonathan M. Marr, Karel Durkota, Francis P. Wilkin, Adam Pere, Alan E.E. Rogers, Vincent L. Fish, Gabriel Holodak, Martina B. Arndt
Demonstrating The Principles Of Aperture Synthesis With The Very Small Radio Telescope, Jonathan M. Marr, Karel Durkota, Francis P. Wilkin, Adam Pere, Alan E.E. Rogers, Vincent L. Fish, Gabriel Holodak, Martina B. Arndt
Physics Faculty Publications
We have developed a set of college-level, table-top labs for teaching the basics of radio interferometry and aperture synthesis. These labs are performed with the Very Small Radio Telescope (VSRT), an interferometer using satellite TV electronics as detectors and compact fluorescent light bulbs as microwave signal sources. The hands-on experience provided by the VSRT in these labs allows students to gain a conceptual understanding of radio interferometry and aperture synthesis without the rigorous mathematical background traditionally required.
Thermodynamics Of The Solar Corona And Evolution Of The Solar Magnetic Field As Inferred From The Total Solar Eclipse Observations Of 2010 July 11, Shadia Rifai Habbal, Miloslav Druckmüller, Huw Morgan, Adalbert Ding, Judd Johnson, Hana Druckmüllerová, Adrian Daw, Martina B. Arndt, Martin Dietzel, Jon Saken
Thermodynamics Of The Solar Corona And Evolution Of The Solar Magnetic Field As Inferred From The Total Solar Eclipse Observations Of 2010 July 11, Shadia Rifai Habbal, Miloslav Druckmüller, Huw Morgan, Adalbert Ding, Judd Johnson, Hana Druckmüllerová, Adrian Daw, Martina B. Arndt, Martin Dietzel, Jon Saken
Physics Faculty Publications
We report on the first multi-wavelength coronal observations, taken simultaneously in white light, Hα 656.3 nm, Fe IX 435.9 nm, Fe X 637.4 nm, Fe XI 789.2 nm, Fe XIII 1074.7 nm, Fe XIV 530.3 nm, and Ni XV 670.2 nm, during the total solar eclipse of 2010 July 11 from the atoll of Tatakoto in French Polynesia. The data enabled temperature differentiations as low as 0.2 × 106 K. The first-ever images of the corona in Fe IX and Ni XV showed that there was very little plasma below 5 × 105 K and above 2.5 × …