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Record Details

Record 1 of 40856
X-ray Interferometry with Transmissive Beam Combiners for Ultra-High Angular Resolution Astronomy
Author and Affiliation:
Skinner, G. K.(Maryland Univ., College Park, MD, United States)
Krismanic, John F.(Universities Space Research Association, United States)
Abstract: Abstract Interferometry provides one of the possible routes to ultra-high angular resolution for X-ray and gamma-ray astronomy. Sub-micro-arc-second angular resolution, necessary to achieve objectives such as imaging the regions around the event horizon of a super-massive black hole at the center of an active galaxy, can be achieved if beams from parts of the incoming wavefront separated by 100s of meters can be stably and accurately brought together at small angles. One way of achieving this is by using grazing incidence mirrors. We here investigate an alternative approach in which the beams are recombined by optical elements working in transmission. It is shown that the use of diffractive elements is a particularly attractive option. We report experimental results from a simple 2-beam interferometer using a low-cost commercially available profiled film as the diffractive elements. A rotationally symmetric filled (or mostly filled) aperture variant of such an interferometer, equivalent to an X-ray axicon, is shown to offer a much wider bandpass than either a Phase Fresnel Lens (PFL) or a PFL with a refractive lens in an achromatic pair. Simulations of an example system are presented.
Publication Date: Jan 01, 2009
Document ID:
20090032045
(Acquired Sep 09, 2009)
Subject Category: ASTRONOMY
Document Type: Preprint
Contract/Grant/Task Num: NNG06EO90A
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: X RAY ASTRONOMY; BLACK HOLES (ASTRONOMY); INTERFEROMETRY; GAMMA RAY ASTRONOMY; HIGH RESOLUTION; LOW COST; ROUTES; WAVE FRONTS; X RAYS
Miscellaneous Notes: Submitted to Experimental Astronomy Springer
Availability Source: Other Sources
Availability Notes: Abstract Only
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