Journal Article

A wide field X-ray telescope for astronomical survey purposes: from theory to practice

Paolo Conconi, Sergio Campana, Gianpiero Tagliaferri, Giovanni Pareschi, Oberto Citterio, Vincenzo Cotroneo, Laura Proserpio and Marta Civitani

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 405, issue 2, pages 877-886
Published in print June 2010 | ISSN: 0035-8711
Published online June 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16513.x
A wide field X-ray telescope for astronomical survey purposes: from theory to practice

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X-ray mirrors are usually built in the Wolter I (paraboloid–hyperboloid) configuration. This design exhibits no spherical aberration on-axis but suffers from field curvature, coma and astigmatism, therefore, the angular resolution degrades rapidly with increasing off-axis angles. Different mirror designs exist in which the primary and secondary mirror profiles are expanded as a power series in order to increase the angular resolution at large off-axis positions, at the expanses of the on-axis performances. Here we present the design and global trade off study of an X-ray mirror systems based on polynomial optics in view of the Wide Field X-ray Telescope (WFXT) mission. WFXT aims at performing an extended cosmological survey in the soft X-ray band with unprecedented flux sensitivity. To achieve these goals the angular resolution required for the mission is very demanding, 5 arcsec mean resolution across a 1 field of view. In addition an effective area of 5–9000 cm2 at 1 keV is needed.

Keywords: instrumentation: high angular resolution; telescopes; X-rays: general

Journal Article.  7824 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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