Dr. Deborah M. Lokhorst Profile

Dr. Deborah M. Lokhorst

at NRC-Herzberg Astronomy & Astrophysics

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Author

Publications (11)

Proceedings Article | 11 September 2024 Poster + Paper

Realizing the potential of the Dragonfly Spectral Line Mapper: calibration methods and on-sky performance

Deborah Lokhorst, Seery Chen, Imad Pasha, Victoria Purcell, William Bowman, Qing Liu, Zili Shen, Aidan MacNichol, Evgeni Malakhov, Roberto Abraham, Pieter van Dokkum

Proceedings Volume 13094, 130942N (2024) https://doi.org/10.1117/12.3018958

KEYWORDS: Tunable filters, Calibration, Bandpass filters, Telescopes, Galactic astronomy, Optical filters, Data modeling, Sensors, Emission wavelengths

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Proceedings Article | 11 September 2024 Poster + Paper

The Dragonfly Spectral Line Mapper: completion of the 120-lens array

Seery Chen, Deborah Lokhorst, Imad Pasha, William Bowman, Qing Liu, Zili Shen, Aiden MacNichol, Evgeni Malakhov, Roberto Abraham, Pieter van Dokkum

Proceedings Volume 13094, 130942J (2024) https://doi.org/10.1117/12.3019491

KEYWORDS: Extragalactic astronomy, Tunable filters, Optical filters, Lenses, Cameras, Design, Bandpass filters, Baffles, Dark current, Telescopes

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Proceedings Article | 21 August 2024 Poster + Paper

Design and status of the CASTOR mission

Patrick Côté, Melissa Amenouche, Deborah Lokhorst

Proceedings Volume 13093, 130933A (2024) https://doi.org/10.1117/12.3019209

KEYWORDS: Ultraviolet radiation, Design, Telescopes, Equipment, Spectroscopes, Imaging spectroscopy, Photometry, Mirrors, UV optics

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Proceedings Article | 21 August 2024 Poster + Paper

The CASTOR mission: performance, uniqueness and science programs

Melissa Amenouche, Patrick Côté, Deborah Lokhorst

Proceedings Volume 13093, 130933L (2024) https://doi.org/10.1117/12.3020167

KEYWORDS: Ultraviolet radiation, Stars, Imaging spectroscopy, Galactic astronomy, Spectroscopy, Telescopes, Image quality, Photometry, Large Synoptic Survey Telescope, Cosmology

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Proceedings Article | 25 July 2024 Presentation + Paper

Software infrastructure for the highly-distributed semi-autonomous Dragonfly spectral line mapper

Imad Pasha, Seery Chen, Deborah Lokhorst, William Bowman, Zili Shen, Qing Liu, Evgeni Malakhov, Roberto Abraham, Pieter van Dokkum

Proceedings Volume 13101, 1310107 (2024) https://doi.org/10.1117/12.3019506

KEYWORDS: Tunable filters, Equipment, Lenses, Optical filters, Computer hardware, Cameras, Telescopes

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Proceedings Article | 29 August 2022 Presentation + Paper

A low-cost ultraviolet-to-infrared absolute quantum efficiency characterization system of detectors

Ajay Gill, Mohamed Shaaban, Aaron Tohuvavohu, Suresh Sivanandam, Roberto Abraham, Seery Chen, Maria Drout, Deborah Lokhorst, Christopher Matzner, Stefan Mochnacki, Calvin Netterfield

Proceedings Volume 12191, 1219114 (2022) https://doi.org/10.1117/12.2627564

KEYWORDS: Quantum efficiency, Sensors, Photodiodes, Electrons, CMOS sensors, Monochromators, Lamps, Cameras, Integrating spheres, Optical filters

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Proceedings Article | 29 August 2022 Presentation + Paper

Distributed aperture telescopes and the Dragonfly Telephoto Array

Roberto Abraham, Pieter van Dokkum, Deborah Lokhorst, Seery Chen, Qing Liu, Michael Rice, E. Lynn Rice

Proceedings Volume 12182, 121821W (2022) https://doi.org/10.1117/12.2629585

KEYWORDS: Telescopes, Sensors, Lenses, Imaging systems, Astronomical telescopes, Optical instrument design, Large telescopes

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Proceedings Article | 26 August 2022 Poster + Presentation + Paper

The Dragonfly Spectral Line Mapper: design and first light

Seery Chen, Deborah Lokhorst, Jeff Shen, Imad Pasha, Evgeni Malakhov, Roberto Abraham, Pieter van Dokkum

Proceedings Volume 12182, 121824E (2022) https://doi.org/10.1117/12.2629582

KEYWORDS: Optical filters, Bandpass filters, Actuators, Cameras, Telescopes, Sensors, Calibration, Spectroscopy, Interference filters, Galactic astronomy

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Proceedings Article | 26 August 2022 Presentation + Paper

The pathfinder Dragonfly Spectral Line Mapper: pushing the limits for ultra-low surface brightness spectroscopy

Deborah Lokhorst, Seery Chen, Imad Pasha, Jeff Shen, Evgeni Malakhov, Roberto Abraham, Pieter van Dokkum

Proceedings Volume 12182, 121821T (2022) https://doi.org/10.1117/12.2629396

KEYWORDS: Optical filters, Telescopes, Calibration, Galactic astronomy, Data modeling, Bandpass filters, Image filtering, Amplifiers, Contamination, Sensors

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Proceedings Article | 13 December 2020 Presentation + Paper

Wide-field ultra-narrow-bandpass imaging with the Dragonfly Telephoto Array

Deborah Lokhorst, Roberto Abraham, Pieter van Dokkum, Seery Chen

Proceedings Volume 11445, 1144527 (2020) https://doi.org/10.1117/12.2561162

KEYWORDS: Imaging systems, Refractor telescopes, Telescopes, Lenses, Image filtering, Galactic astronomy, Instrument modeling, Calibration

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Proceedings Article | 8 August 2016 Paper

HIRAX: a probe of dark energy and radio transients

L. Newburgh, K. Bandura, M. Bucher, T.-C. Chang, H. Chiang, J.F. Cliche, R. Davé, M. Dobbs, C. Clarkson, K. Ganga, T. Gogo, A. Gumba, N. Gupta, M. Hilton, B. Johnstone, A. Karastergiou, M. Kunz, D. Lokhorst, R. Maartens, S. Macpherson, M. Mdlalose, K. Moodley, L. Ngwenya, J. Parra, J. Peterson, O. Recnik, B. Saliwanchik, M. Santos, J. Sievers, O. Smirnov, P. Stronkhorst, R. Taylor, K. Vanderlinde, G. Van Vuuren, A. Weltman, A. Witzemann

Proceedings Volume 9906, 99065X (2016) https://doi.org/10.1117/12.2234286

KEYWORDS: Baryon acoustic oscillations, Hydrogen, Interferometers, Galactic astronomy, Optical correlators, Antennas, Calibration, Prototyping, Physics, Astronomy

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The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a new 400{800MHz radio interferometer under development for deployment in South Africa. HIRAX will comprise 1024 six meter parabolic dishes on a compact grid and will map most of the southern sky over the course of four years. HIRAX has two primary science goals: to constrain Dark Energy and measure structure at high redshift, and to study radio transients and pulsars. HIRAX will observe unresolved sources of neutral hydrogen via their redshifted 21-cm emission line (`hydrogen intensity mapping'). The resulting maps of large-scale structure at redshifts 0.8{2.5 will be used to measure Baryon Acoustic Oscillations (BAO). BAO are a preferential length scale in the matter distribution that can be used to characterize the expansion history of the Universe and thus understand the properties of Dark Energy. HIRAX will improve upon current BAO measurements from galaxy surveys by observing a larger cosmological volume (larger in both survey area and redshift range) and by measuring BAO at higher redshift when the expansion of the universe transitioned to Dark Energy domination. HIRAX will complement CHIME, a hydrogen intensity mapping experiment in the Northern Hemisphere, by completing the sky coverage in the same redshift range. HIRAX's location in the Southern Hemisphere also allows a variety of cross-correlation measurements with large-scale structure surveys at many wavelengths. Daily maps of a few thousand square degrees of the Southern Hemisphere, encompassing much of the Milky Way galaxy, will also open new opportunities for discovering and monitoring radio transients. The HIRAX correlator will have the ability to rapidly and efficiently detect transient events. This new data will shed light on the poorly understood nature of fast radio bursts (FRBs), enable pulsar monitoring to enhance long-wavelength gravitational wave searches, and provide a rich data set for new radio transient phenomena searches. This paper discusses the HIRAX instrument, science goals, and current status.

Showing 5 of 11 publications

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