Outputs (1101)

Wind-driven halo in high-contrast images (2020)
Journal Article
Cantalloube, F., Farley, O., Milli, J., Bharmal, N., Brandner, W., Correia, C., …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.

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., …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.

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., …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.

Probing the physical properties of the intergalactic medium using gamma-ray bursts (2021)
Journal Article
Dalton, T., Morris, S. L., & Fumagalli, M. (2021). Probing the physical properties of the intergalactic medium using gamma-ray bursts. Monthly Notices of the Royal Astronomical Society, 502(4), 5981-5996. https://doi.org/10.1093/mnras/stab335

We use gamma-ray burst (GRB) spectra total continuum absorption to estimate the key intergalactic medium (IGM) properties of hydrogen column density (⁠NHXIGM⁠), metallicity, temperature, and ionization parameter over a redshift range of 1.6 ≤ z ≤ 6.3... Read More about Probing the physical properties of the intergalactic medium using gamma-ray bursts.

KSIM: simulating KIDSpec, a Microwave Kinetic Inductance Detector spectrograph for the optical/NIR (2023)
Journal Article
Hofmann, V. B., & O'Brien, K. (2023). KSIM: simulating KIDSpec, a Microwave Kinetic Inductance Detector spectrograph for the optical/NIR. RAS Techniques and Instruments, 2(1), 278-292. https://doi.org/10.1093/rasti/rzad018

KIDSpec, the Kinetic Inductance Detector Spectrometer, is a proposed optical to near-IR Microwave Kinetic Inductance Detector (MKID) spectrograph. MKIDs are superconducting photon counting detectors which are able to resolve the energy of incoming ph... Read More about KSIM: simulating KIDSpec, a Microwave Kinetic Inductance Detector spectrograph for the optical/NIR.

Pair lines of sight observations of multiphase gas bearing O vi in a galaxy environment (2021)
Journal Article
Anshul, P., Narayanan, A., Muzahid, S., Beckett, A., & Morris, S. L. (2021). Pair lines of sight observations of multiphase gas bearing O vi in a galaxy environment. Monthly Notices of the Royal Astronomical Society, 503(3), 3243-3261. https://doi.org/10.1093/mnras/stab396

Using HST/COS spectra of the twin quasar lines of sight Q 0107–025A & Q 0107–025B, we report on the physical properties, chemical abundances, and transverse sizes of a multiphase medium in a galaxy field at z = 0.399. The angular separation between t... Read More about Pair lines of sight observations of multiphase gas bearing O vi in a galaxy environment.

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.

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.

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.

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.

Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye (2020)
Journal Article
Wyrzykowski, Ł., Mróz, P., Rybicki, K., Gromadzki, M., Kołaczkowski, Z., Zieliński, M., …Zubareva, A. (2020). Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye. Astronomy & Astrophysics, 633, Article A98. https://doi.org/10.1051/0004-6361/201935097

Gaia16aye was a binary microlensing event discovered in the direction towards the northern Galactic disc and was one of the first microlensing events detected and alerted to by the Gaia space mission. Its light curve exhibited five distinct brighteni... Read More about Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye.

ELT-scale elongated LGS wavefront sensing: on-sky results (2021)
Journal Article
Bardou, L., Gendron, E., Rousset, G., Gratadour, D., Basden, A., Bonaccini Calia, D., …Vidal, F. (2021). ELT-scale elongated LGS wavefront sensing: on-sky results. Astronomy & Astrophysics, 649, Article A158. https://doi.org/10.1051/0004-6361/202038330

Context. Laser guide stars (LGS) allow adaptive optics (AO) systems to reach greater sky coverage, especially for AO systems correcting the atmospheric turbulence on large fields of view. However LGS suffer from limitations, among which is their appa... Read More about ELT-scale elongated LGS wavefront sensing: on-sky results.

First stellar photons for an integrated optics discrete beam combiner at the William Herschel Telescope (2021)
Journal Article
Nayak, A. S., Labadie, L., Sharma, T. K., Piacentini, S., Corrielli, G., Osellame, R., …Roth, M. M. (2021). First stellar photons for an integrated optics discrete beam combiner at the William Herschel Telescope. Applied Optics, 60(19), D129-D142. https://doi.org/10.1364/ao.423881

We present the first on-sky results of a four-telescope integrated optics discrete beam combiner (DBC) tested at the 4.2 m William Herschel Telescope. The device consists of a four-input pupil remapper followed by a DBC and a 23-output reformatter. T... Read More about First stellar photons for an integrated optics discrete beam combiner at the William Herschel Telescope.

KASHz: No evidence for ionised outflows instantaneously suppressing star formation in moderate luminosity AGN at z∼1.4–2.6 (2020)
Journal Article
Scholtz, J., Harrison, C., Rosario, D., Alexander, D., Chen, C., Kakkad, D., …Stach, S. (2020). KASHz: No evidence for ionised outflows instantaneously suppressing star formation in moderate luminosity AGN at z∼1.4–2.6. Monthly Notices of the Royal Astronomical Society, 492(3), 3194-3216. https://doi.org/10.1093/mnras/staa030

As part of our KMOS AGN Survey at High-redshift (KASHz), we present spatially-resolved VLT/KMOS and VLT/SINFONI spectroscopic data and ALMA 870μm continuum imaging of eight z=1.4–2.6 moderate AGN (⁠L 2−10kev L2−10kev = 1042 − 1045 ergs s−1). We map [... Read More about KASHz: No evidence for ionised outflows instantaneously suppressing star formation in moderate luminosity AGN at z∼1.4–2.6.

Freeform based hYperspectral imager for MOisture Sensing (FYMOS) (2021)
Journal Article
Graham, C., Girkin, J. M., & Bourgenot, C. (2021). Freeform based hYperspectral imager for MOisture Sensing (FYMOS). Optics Express, 29(11), 16007-16018. https://doi.org/10.1364/oe.425660

We present FYMOS, an all-aluminum, robust, light weight, freeform based, near infrared hYperspectral imager for MOisture Sensing. FYMOS was designed and built to remotely measure moisture content using spectral features from 0.7-1.7µm integrating an... Read More about Freeform based hYperspectral imager for MOisture Sensing (FYMOS).

Robust diffraction-limited near-infrared-to-near-ultraviolet wide-field imaging from stratospheric balloon-borne platforms—Super-pressure Balloon-borne Imaging Telescope performance (2020)
Journal Article
Romualdez, L. J., Benton, S. J., Brown, A. M., Clark, P., Damaren, C. J., Eifler, T., …Tam, S. (2020). Robust diffraction-limited near-infrared-to-near-ultraviolet wide-field imaging from stratospheric balloon-borne platforms—Super-pressure Balloon-borne Imaging Telescope performance. Review of Scientific Instruments, 91(3), Article 034501. https://doi.org/10.1063/1.5139711

At a fraction of the total cost of an equivalent orbital mission, scientific balloon-borne platforms, operating above 99.7% of the Earth’s atmosphere, offer attractive, competitive, and effective observational capabilities—namely, space-like seeing,... Read More about Robust diffraction-limited near-infrared-to-near-ultraviolet wide-field imaging from stratospheric balloon-borne platforms—Super-pressure Balloon-borne Imaging Telescope performance.

Into the Lyα jungle: exploring the circumgalactic medium of galaxies at z ∼ 4 − 5 with MUSE (2020)
Journal Article
Bielby, R. M., Fumagalli, M., Fossati, M., Rafelski, M., Oppenheimer, B., Cantalupo, S., …Peroux, C. (2020). Into the Lyα jungle: exploring the circumgalactic medium of galaxies at z ∼ 4 − 5 with MUSE. Monthly Notices of the Royal Astronomical Society, 493(4), 5336-5356. https://doi.org/10.1093/mnras/staa546

We present a study of the galaxy environment of 9 strong H I+C IV absorption line systems (16.2 < log(N(HI)) < 21.2) spanning a wide range in metallicity at z ∼ 4 − 5, using MUSE integral field and X-Shooter spectroscopic data collected in a z ≈ 5.26... Read More about Into the Lyα jungle: exploring the circumgalactic medium of galaxies at z ∼ 4 − 5 with MUSE.

KIDSpec: An MKID-Based Medium-Resolution, Integral Field Spectrograph (2020)
Journal Article
O’Brien, K. (2020). KIDSpec: An MKID-Based Medium-Resolution, Integral Field Spectrograph. Journal of Low Temperature Physics, 199(1-2), 537-546. https://doi.org/10.1007/s10909-020-02347-z

KIDSpec, the Kinetic Inductance Detector Spectrograph, is a concept for a highly sensitive, medium-spectral-resolution optical through near-IR spectrograph. It uses the intrinsic-energy-resolving capability of an array of optical/IR-sensitive MKIDs t... Read More about KIDSpec: An MKID-Based Medium-Resolution, Integral Field Spectrograph.

MUSE Analysis of Gas around Galaxies (MAGG) - I: Survey design and the environment of a near pristine gas cloud at z ≈ 3.5 (2019)
Journal Article
Lofthouse, E. K., Fumagalli, M., Fossati, M., O’Meara, J. M., Murphy, M. T., Christensen, L., …Morris, S. L. (2020). MUSE Analysis of Gas around Galaxies (MAGG) - I: Survey design and the environment of a near pristine gas cloud at z ≈ 3.5. Monthly Notices of the Royal Astronomical Society, 491(2), 2057-2074. https://doi.org/10.1093/mnras/stz3066

We present the design, methods, and first results of the MUSE Analysis of Gas around Galaxies (MAGG) survey, a large programme on the Multi Unit Spectroscopic Explorer (MUSE) instrument at the Very Large Telescope (VLT) which targets 28 z > 3.2 quasa... Read More about MUSE Analysis of Gas around Galaxies (MAGG) - I: Survey design and the environment of a near pristine gas cloud at z ≈ 3.5.

Physical Constraints from Near-infrared Fast Photometry of the Black Hole Transient GX 339–4 (2019)
Journal Article
Vincentelli, F., Casella, P., Petrucci, P., Maccarone, T., Russell, D., Uttley, P., …Tomsick, J. (2019). Physical Constraints from Near-infrared Fast Photometry of the Black Hole Transient GX 339–4. Astrophysical Journal Letters, 887(1), Article L19. https://doi.org/10.3847/2041-8213/ab5860

We present results from the first multi-epoch X-ray/IR fast-photometry campaign on the black hole transient GX 339–4, during its 2015 outburst decay. We studied the evolution of the power spectral densities finding strong differences between the two... Read More about Physical Constraints from Near-infrared Fast Photometry of the Black Hole Transient GX 339–4.