Dr. William Dunn Profile

Dr. William Dunn

at Univ. College London

SPIE Involvement:

Author

Publications (3)

Proceedings Article | 21 August 2024 Presentation + Paper

The Line Emission Mapper (LEM) probe mission concept

R. Kraft, Á Bogdán, J. ZuHone, J. Adams, J. Alvarado-Gómez, C. Argiroffi, M. Ayromlou, M. Azadi, S. Bandler, M. Barbera, A. Bhardwaj, V. Biffi, D. Bodewits, E. Boettcher, B. Branham, J. Burchett, D. Burke, J. Cann, J. Carter, D. Castro, P. Chakraborty, K. Chan, S. Chen, E. Churazov, K. Coderre, M. Corcoran, R. Cumbee, S. DePalo, K. Dolag, M. Donahue, W. Doriese, J. Drake, W. Dunn, M. Eckart, D. Eckert, S. Ettori, Y. Ezoe, C. Feldman, E. Flaccomio, W. Forman, M. Galeazzi, A. Gall, C. Garraffo, M. Gonzalez, N. Grosso, J. Hartley, N. Hell, L. Hernquist, E. Hodges-Kluck, J. Houston, S. Hull, N. Islam, P. Janas, F. Jennings, C. Jones, P. Kaaret, H. Kanner, M. Karovska, V. Kashyap, P. Kavanagh, R. Kelley, I. Khabibullin, C. Kilbourne, C.-G. Kim, D. Koutroumpa, O. Kovács, K. Kuntz, S.-H. Lee, M. Leutenegger, T. Linn, S. Lotti, M. Markevitch, K. Martin, L. May, D. McCammon, S. McEntee, S. Mei, F. Mernier, M. Miceli, J. Miller, M. Mirakhor, K. Monsch, Y. Nazé, D. Nelson, A. Nordt, A. Ogorzalek, J. Olson, S. Orlando, E. Osborne, L. Oskinova, D. Patnaude, R. Pfeifle, C. Pinto, {/ Plucinsky, G. Ponti, D. Porquet, F. Porter, D. Préle, S. Ramm, S. Randall, E. Rasia, M. Rau, S. Richardson, K. Sakai, A. Sarkar, G. Schellenberger, S. Sciortino, J. Schaye, A. Simionescu, S. Smith, M. Sobolewska, J. Steiner, J. Stern, Y. Su, M. Sun, N. Truong, E. Ursino, M. Valentini, S. Veilleux, S. Vladutescu-Zopp, M. Vogelsberger, N. Wakeham, S. Walker, Q. Wang, B. Wargelin, K. Weaver, J. Werk, N. Werner, S. Wolk, C. Zhang, W. Zhang, I. Zhuravleva

Proceedings Volume 13093, 1309327 (2024) https://doi.org/10.1117/12.3019969

KEYWORDS: X-rays, Galactic astronomy, Stars, Bubbles, Spectral resolution, Iron, Physics, Spectroscopy, Metals, Plasma

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The Line Emission Mapper (LEM) is a Probe mission concept developed in response to NASA’s Astrophysics Probe Explorer (APEX) Announcement of Opportunity. LEM has a single science instrument composed of a large-area, wide-field X-ray optic and a microcalorimeter X-ray imaging spectrometer in the focal plane. LEM is optimized to observe low-surface-brightness diffuse X-ray emission over a 30′ equivalent diameter field of view with 1.3 and 2.5 eV spectral resolution in the 0.2−2.0 keV band. Our primary scientific objective is to map the thermal, kinetic, and elemental properties of the diffuse gas in the extended X-ray halos of galaxies, the outskirts of galaxy clusters, the filamentary structures between these clusters, the Milky Way star-formation regions, the Galactic halo, and supernova remnants in the Milky Way and Local Group. The combination of a wide-field optic with 18′′ angular resolution end-to-end and a microcalorimeter array with 1.3 eV spectral resolution in a 5′ × 5′ inner array (2.5 eV outside of that) offers unprecedented sensitivity to extended low-surface-brightness X-ray emission. This allows us to study feedback processes, gas dynamics, and metal enrichment over seven orders of magnitude in spatial scales, from parsecs to tens of megaparsecs. LEM will spend approximately 11% of its five-year prime science mission performing an All-Sky Survey, the first all-sky X-ray survey at high spectral resolution. The remainder of the five-year science mission will be divided between directed science (30%) and competed General Observer science (70%). LEM and the NewAthena/XIFU are highly complementary, with LEM’s optimization for soft X-rays, large FOV, 1.3 eV spectral resolution, and large grasp balancing the NewAthena/X-IFU’s broadband sensitivity, large effective area, and unprecedented spectral resolving power at 6 keV. In this presentation, we will provide an overview of the mission architecture, the directed science driving the mission design, and the broad scope these capabilities offer to the entire astrophysics community.

SPIE Journal Paper | 15 March 2024

Extending the high-resolution X-ray spectroscopy of Line Emission Mapper to UV/optically-bright sources

Jeremy Drake, Simon Bandler, Marco Barbera, Enrico Bozzo, William Dunn, Cecilia Garraffo, Thomas Gauron, Ludovic Genolet, Janice Houston, Richard Kelley, Caroline Kilbourne, Ralph Kraft, Maurice Leutenegger, Ugo Lo Cicero, Seán McEntee, Daniel Patnaude

JATIS, Vol. 10, Issue 01, 014006, (March 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.1.014006

KEYWORDS: Tunable filters, X-rays, Stars, Aluminum, Optical filters, Beryllium, Spectroscopy, Ultraviolet radiation, UV optics, Solar system

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Proceedings Article | 5 October 2023 Poster + Paper

Capabilities of a lobster eye telescope in the outer solar system

Charlotte Feldman, William Dunn, Simon Lindsay, Adrian Martindale

Proceedings Volume 12679, 1267917 (2023) https://doi.org/10.1117/12.2677336

KEYWORDS: X-rays, Eye, Equipment, X-ray telescopes, Jupiter, X-ray imaging, Solar processes, Planets, Telescopes, Plasma

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