Skip to main content

Research Repository

Advanced Search

Outputs (29)

Correction of finite spatial and temporal sampling effects in stereo-SCIDAR (2020)
Presentation / Conference Contribution
Butterley, T., Sarazin, M., Le Louarn, M., Osborn, J., & Farley, O. J. (2020, December). Correction of finite spatial and temporal sampling effects in stereo-SCIDAR. Presented at SPIE Astronomical Telescopes + Instrumentation 2020, Online

Stereo scintillation detection and ranging (S-SCIDAR) is a development of the well-established SCIDAR turbulence profiling technique. An S-SCIDAR instrument has been installed at the focus of one of the 1.8m Auxiliary Telescopes at Paranal observator... Read More about Correction of finite spatial and temporal sampling effects in stereo-SCIDAR.

FASS: a turbulence profiler based on a fast, low-noise camera (2020)
Journal Article
Guesalaga, A., Ayancán, B., Sarazin, M., Wilson, R., Perera, S., & Le Louarn, M. (2021). FASS: a turbulence profiler based on a fast, low-noise camera. Monthly Notices of the Royal Astronomical Society, 501(2), 3030-3045. https://doi.org/10.1093/mnras/staa3823

The measurement of the atmospheric optical turbulence with a new scintillation profiler is described and demonstrated. The instrument, FASS (Full Aperture Scintillation Sensor), uses new fast and low-noise detectors to record and process sequences of... Read More about FASS: a turbulence profiler based on a fast, low-noise camera.

The evolution of gas-phase metallicity and resolved abundances in star-forming galaxies at z ≍ 0.6-1.8 (2020)
Journal Article
Gillman, S., Tiley, A., Swinbank, A., Dudzevičiūtė, U., Sharples, R., Smail, I., Harrison, C., Bunker, A. J., Bureau, M., Cirasuolo, M., Magdis, G. E., Mendel, T., & Stott, J. P. (2021). The evolution of gas-phase metallicity and resolved abundances in star-forming galaxies at z ≍ 0.6-1.8. Monthly Notices of the Royal Astronomical Society, 500(3), 4229-4247. https://doi.org/10.1093/mnras/staa3400

We present an analysis of the chemical abundance properties of ≈650 star-forming galaxies at z ≈ 0.6–1.8. Using integral-field observations from the K-band multi-object spectrograph (KMOS), we quantify the [N II]/H α emission-line ratio, a proxy for... Read More about The evolution of gas-phase metallicity and resolved abundances in star-forming galaxies at z ≍ 0.6-1.8.

Three-dimensional data capture and analysis of intact eye lenses evidences emmetropia-associated changes and strain-dependent differences in epithelial cell organization (2020)
Journal Article
Kalligeraki, A. A., Isted, A., Pal, R., Saunter, C., Girkin, J., Jarrin, M., Uwineza, A., Obara, B., & Quinlan, R. A. (2020). Three-dimensional data capture and analysis of intact eye lenses evidences emmetropia-associated changes and strain-dependent differences in epithelial cell organization. Scientific Reports, 10, Article 16898. https://doi.org/10.1038/s41598-020-73625-9

Organ and tissue development are highly coordinated processes; lens growth and functional integration into the eye (emmetropia) is a robust example. An epithelial monolayer covers the anterior hemisphere of the lens, and its organization is the key t... Read More about Three-dimensional data capture and analysis of intact eye lenses evidences emmetropia-associated changes and strain-dependent differences in epithelial cell organization.

Cellular localisation of structurally diverse diphenylacetylene fluorophores (2020)
Journal Article
Chisholm, D. R., Hughes, J. G., Blacker, T. S., Humann, R., Adams, C., Callaghan, D., Pujol, A., Lembicz, N. K., Bain, A. J., Girkin, J. M., Ambler, C. A., & Whiting, A. (2020). Cellular localisation of structurally diverse diphenylacetylene fluorophores. Organic and Biomolecular Chemistry, 18(45), 9231-9245. https://doi.org/10.1039/d0ob01153c

Fluorescent probes are increasingly used as reporter molecules in a wide variety of biophysical experiments, but when designing new compounds it can often be difficult to anticipate the effect that changing chemical structure can have on cellular loc... Read More about Cellular localisation of structurally diverse diphenylacetylene fluorophores.

First Principle Simulator of a Stochastically Varying Image Plane for Photon-counting High Contrast Applications (2020)
Journal Article
Dodkins, R. H., Davis, K. K., Lewis, B., Mahashabde, S., Mazin, B. A., Lipartito, I. A., Fruitwala, N., O’Brien, K., & Thatte, N. (2020). First Principle Simulator of a Stochastically Varying Image Plane for Photon-counting High Contrast Applications. Publications of the Astronomical Society of the Pacific, 132(1016), Article 104503. https://doi.org/10.1088/1538-3873/aba9e4

Optical and near-infrared Microwave Kinetic Inductance Detectors, or MKIDs are low-temperature detectors with inherent spectral resolution that are able to instantly register individual photons with potentially no false counts or readout noise. These... Read More about First Principle Simulator of a Stochastically Varying Image Plane for Photon-counting High Contrast Applications.

GPU Fast Convolution via the Overlap-and-Save Method in Shared Memory (2020)
Journal Article
Adámek, K., Dimoudi, S., Giles, M., & Armour, W. (2020). GPU Fast Convolution via the Overlap-and-Save Method in Shared Memory. ACM Transactions on Architecture and Code Optimization, 17(3), Article 18. https://doi.org/10.1145/3394116

We present an implementation of the overlap-and-save method, a method for the convolution of very long signals with short response functions, which is tailored to GPUs. We have implemented several FFT algorithms (using the CUDA programming language),... Read More about GPU Fast Convolution via the Overlap-and-Save Method in Shared Memory.

On-sky results for adaptive optics control with data-driven models on low-order modes (2020)
Journal Article
Sinquin, B., Prengere, L., Kulcsár, C., Raynaud, H.-F., Gendron, E., Osborn, J., Basden, A., Conan, J.-M., Bharmal, N., Bardou, L., Staykov, L., Morris, T., Buey, T., Chemla, F., & Cohen, M. (2020). On-sky results for adaptive optics control with data-driven models on low-order modes. Monthly Notices of the Royal Astronomical Society, 498(3), 3228-3240. https://doi.org/10.1093/mnras/staa2562

Dedicated tip-tilt loops are commonly implemented on adaptive optics (AO) systems. In addition, a number of recent high-performance systems feature tip-tilt controllers which are more efficient than the integral action controller. In this context, Li... Read More about On-sky results for adaptive optics control with data-driven models on low-order modes.

Gaia 18dvy: A New FUor in the Cygnus OB3 Association (2020)
Journal Article
Szegedi-Elek, E., Ábrahám, P., Wyrzykowski, Ł., Kun, M., Kóspál, Á., Chen, L., Marton, G., Moór, A., Kiss, C., Pál, A., Szabados, L., Varga, J., Varga-Verebélyi, E., Andreas, C., Bachelet, E., Bischoff, R., Bódi, A., Breedt, E., Burgaz, U., Butterley, T., …Ziółkowska, O. (2020). Gaia 18dvy: A New FUor in the Cygnus OB3 Association. Astrophysical Journal, 899(2), Article 130. https://doi.org/10.3847/1538-4357/aba129

We present optical–infrared photometric and spectroscopic observations of Gaia 18dvy, located in the Cygnus OB3 association at a distance of 1.88 kpc. Gaia 18dvy was noted by the Gaia alerts system when its light curve exhibited a gsim4 mag rise in 2... Read More about Gaia 18dvy: A New FUor in the Cygnus OB3 Association.

Doppler coherence imaging of scrape-off-layer impurity flows in the HL-2A tokamak (2020)
Journal Article
Long, T., Allcock, J., Nie, L., Sharples, R., Xu, M., Ke, R., Zhang, S., Silburn, S., Howard, J., Yu, Y., Yuan, B., Wang, Z., Song, X., Liu, L., & Duan, X. (2020). Doppler coherence imaging of scrape-off-layer impurity flows in the HL-2A tokamak. Review of Scientific Instruments, 91(8), Article 083504. https://doi.org/10.1063/5.0005609

A new Doppler coherence imaging spectroscopy interferometer has been developed on the HL-2A tokamak for the scrape-off-layer impurity flow measurement. Its spatial resolution is estimated to be up to ∼0.8 mm in the horizontal direction and ∼9 mm in t... Read More about Doppler coherence imaging of scrape-off-layer impurity flows in the HL-2A tokamak.

Quasar Sightline and Galaxy Evolution (QSAGE) survey - II. Galaxy overdensities around UV luminous quasars at z = 1-2 (2020)
Journal Article
Stott, J., Bielby, R., Cullen, F., Burchett, J., Tejos, N., Fumagalli, M., Crain, R., Morris, S., Amos, N., Bower, R., & Prochaska, J. (2020). Quasar Sightline and Galaxy Evolution (QSAGE) survey - II. Galaxy overdensities around UV luminous quasars at z = 1-2. Monthly Notices of the Royal Astronomical Society, 497(3), 3083-3096. https://doi.org/10.1093/mnras/staa2096

We demonstrate that the UV brightest quasars at z = 1–2 live in overdense environments. This is based on an analysis of deep Hubble Space Telescope WFC3 G141 grism spectroscopy of the galaxies along the lines-of-sight to UV luminous quasars in the re... Read More about Quasar Sightline and Galaxy Evolution (QSAGE) survey - II. Galaxy overdensities around UV luminous quasars at z = 1-2.

Mesoscale modelling of optical turbulence in the atmosphere: the need for ultrahigh vertical grid resolution (2020)
Journal Article
Basu, S., Osborn, J., He, P., & DeMarco, A. (2020). Mesoscale modelling of optical turbulence in the atmosphere: the need for ultrahigh vertical grid resolution. Monthly Notices of the Royal Astronomical Society, 497(2), 2302-2308. https://doi.org/10.1093/mnras/staa2010

The high-fidelity modelling of optical turbulence is critical to the design and operation of a new class of emerging highly sophisticated astronomical telescopes and adaptive optics instrumentation. In this study, we perform retrospective simulations... Read More about Mesoscale modelling of optical turbulence in the atmosphere: the need for ultrahigh vertical grid resolution.

Wind-driven halo in high-contrast images (2020)
Journal Article
Cantalloube, F., Farley, O., Milli, J., Bharmal, N., Brandner, W., Correia, C., Dohlen, K., Henning, T., Osborn, J., Por, E., Suárez Valles, M., & Vigan, A. (2020). Wind-driven halo in high-contrast images. Astronomy & Astrophysics, 638, Article A98. https://doi.org/10.1051/0004-6361/201937397

Context. The wind-driven halo is a feature that is observed in images that were delivered by the latest generation of ground-based instruments that are equipped with an extreme adaptive optics system and a coronagraphic device, such as SPHERE at the... Read More about Wind-driven halo in high-contrast images.

VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multiwavelength Study (2020)
Journal Article
Archer, A., Benbow, W., Bird, R., Brill, A., Buchovecky, M., Buckley, J., Carini, M., Christiansen, J., Chromey, A., Daniel, M., Errando, M., Falcone, A., Feng, Q., Fortin, P., Fortson, L., Furniss, A., Gent, A., Georganopoulos, M., Gillanders, G., Giuri, C., …Williamson, T. (2020). VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multiwavelength Study. Astrophysical Journal, 896(1), https://doi.org/10.3847/1538-4357/ab910e

A search for γ-ray emission from a sample of local universe low-frequency selected radio galaxies (2020)
Journal Article
Harvey, M., Rulten, C. B., & Chadwick, P. M. (2020). A search for γ-ray emission from a sample of local universe low-frequency selected radio galaxies. Monthly Notices of the Royal Astronomical Society, 496(1), 903-912. https://doi.org/10.1093/mnras/staa1593

Radio galaxies are uncommon γ-ray emitters, and only low redshift radio galaxies are detected with Fermi-LAT. However, they offer potential insights into the emission mechanisms of active galaxies, particularly as the alignment of their jets with res... Read More about A search for γ-ray emission from a sample of local universe low-frequency selected radio galaxies.

Wavefront prediction using artificial neural networks for open-loop Adaptive Optics (2020)
Journal Article
Liu, X., Morris, T., Saunter, C., Juez, F. J. D. C., Gonzalez-Gutierrez, C., & Bardou, L. (2020). Wavefront prediction using artificial neural networks for open-loop Adaptive Optics. Monthly Notices of the Royal Astronomical Society, 496(1), 456-464. https://doi.org/10.1093/mnras/staa1558

Latency in the control loop of adaptive optics (AO) systems can severely limit performance. Under the frozen flow hypothesis linear predictive control techniques can overcome this; however, identification and tracking of relevant turbulent parameters... Read More about Wavefront prediction using artificial neural networks for open-loop Adaptive Optics.

Using realistic host galaxy metallicities to improve the GRB X-ray equivalent total hydrogen column density and constrain the intergalactic medium density (2020)
Journal Article
Morris, S. L., & Dalton, T. (2020). Using realistic host galaxy metallicities to improve the GRB X-ray equivalent total hydrogen column density and constrain the intergalactic medium density. Monthly Notices of the Royal Astronomical Society, 495(2), 2342-2353. https://doi.org/10.1093/mnras/staa1321

It is known that the GRB equivalent hydrogen column density (NHX) changes with redshift and that, typically, NHX is greater than the GRB host neutral hydrogen column density. We have compiled a large sample of data for GRB NHX and metallicity [X/H].... Read More about Using realistic host galaxy metallicities to improve the GRB X-ray equivalent total hydrogen column density and constrain the intergalactic medium density.

Limitations imposed by optical turbulence profile structure and evolution on tomographic reconstruction for the ELT (2020)
Journal Article
Farley, O., Osborn, J., Morris, T., Fusco, T., Neichel, B., Correia, C., & Wilson, R. (2020). Limitations imposed by optical turbulence profile structure and evolution on tomographic reconstruction for the ELT. Monthly Notices of the Royal Astronomical Society, 494(2), 2773-2784. https://doi.org/10.1093/mnras/staa795

The performance of tomographic adaptive optics (AO) systems is intrinsically linked to the vertical profile of optical turbulence. First, a sufficient number of discrete turbulent layers must be reconstructed to model the true continuous turbulence p... Read More about Limitations imposed by optical turbulence profile structure and evolution on tomographic reconstruction for the ELT.

OSZAR »