A5103148337- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- SAS software applications and methods
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- VLSI and FPGA Design Techniques
- Adaptive optics and wavefront sensing
- Particle accelerators and beam dynamics
- Irrigation Practices and Water Management
- Pulsars and Gravitational Waves Research
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- Gyrotron and Vacuum Electronics Research
- Embedded Systems Design Techniques
- Solar and Space Plasma Dynamics
- 3D IC and TSV technologies
- Superconducting Materials and Applications
- Manufacturing Process and Optimization
- BIM and Construction Integration
University of Kent
2025
Saudi Aramco (Saudi Arabia)
2025
Liverpool John Moores University
2015-2024
Cardiff University
2023
Aristotle University of Thessaloniki
2023
Cockcroft Institute
2013-2021
Daresbury Laboratory
1994-2020
Sci-Tech Daresbury
2014-2020
University of California, Berkeley
2020
University of Southern Queensland
1991-2018
We present the final catalogue of 2dF QSO Redshift Survey (2QZ), based on Anglo-Australian Telescope spectroscopic observations 44576 colour-selected (u b_J r) objects with 18.25<b_J<20.85 selected from APM scans UK Schmidt (UKST) photographic plates. The 2QZ comprises 23338 QSOs, 12292 galactic stars (including 2071 white dwarfs) and 4558 compact narrow-emission-line galaxies. obtained a reliable identification for 86 per cent observed 2dF. also report 6dF (6QZ), UKST 1564 brighter...
We present a determination of the optical QSO luminosity function and its cosmological evolution with redshift for sample over 6000 QSOs identified primarily from first observations 2dF Redshift Survey (2QZ). For -26 < M_B -23 0.35 z 2.3, we find that pure (PLE) models provide an acceptable fit to observed dependence function. The is best by two-power-law form. Exponential models, both as look-back time, general second-order polynomial redshift, were found fits dataset comprising 2QZ Large...
In this paper we present a clustering analysis of quasi-stellar objects (QSOs) using over 20000 from the final catalogue 2dF QSO Redshift Survey (2QZ), measuring redshift-space two-point correlation function, ξ(s). When averaged redshift range 0.3 < z 2.2 find that ξ(s) is flat on small scales, steepening scales above ∼25h−1 Mpc. WMAP/2dF cosmology (Ωm = 0.27, ΩΛ 0.73) best-fitting power law with s0 5.48+0.42−0.48h−1 Mpc and γ= 1.20 ± 0.10 s 1 to 25h−1 We demonstrate non-linear distortions...
The Liverpool Telescope is a 2.0 metre robotic telescope that operating unattended at the Observatorio del Roque de Los Muchachos, Spain. This paper gives an overview of design and implementation its instrumentation presents snapshot current performance during commissioning process. Science observations are under way, we give brief highlights from number programmes have been enabled by nature telescope.
We present a catalogue comprising over 10 000 QSOs covering an effective area of 289.6 deg2, based on spectroscopic observations with the 2-degree Field (2dF) instrument at Anglo-Australian Telescope. This forms first release 2dF QSO Redshift Survey. candidates 18.25<bJ<20.85 were obtained from single homogeneous colour-selected APM measurements UK Schmidt photographic material. The final will contain approximately 25 and be released to public end 2002, one year after observational phase is...
On May 31, 2011 UT a supernova (SN) exploded in the nearby galaxy M51 (the Whirlpool Galaxy). We discovered this event using small telescopes equipped with CCD cameras, as well by Palomar Transient Factory (PTF) survey, and rapidly confirmed it to be Type II supernova. Our early light curve spectroscopy indicates that PTF11eon resulted from explosion of relatively compact progenitor star evidenced rapid shock-breakout cooling seen curve, low temperature early-time spectra prompt appearance...
Type-IIn supernovae (SNe), which are characterized by strong interaction of their ejecta with the surrounding circumstellar matter (CSM), provide a unique opportunity to study mass-loss history massive stars shortly before explosive death. We present discovery and follow-up observations Type IIn SN, PTF 09uj, detected Palomar Transient Factory (PTF). Serendipitous GALEX at ultraviolet (UV) wavelengths rise SN light curve prior discovery. The UV rose fast, time scale few days, absolute AB...
We present ground-based and HST optical infrared observations of XRF 100316D / SN 2010bh. It is seen that the light curves 2010bh evolve at a faster rate than archetype GRB-SN 1998bw, but similar to 2006aj, supernova was spectroscopically linked with 060218, non-GRB associated type Ic 1994I. estimate rest-frame extinction this event from our data be E(B-V)=0.18 +/- 0.08 mag. find V-band absolute magnitude M_{V}=-18.62 0.08, which faintest peak observed to-date for spectroscopically-confirmed...
We describe the development of a low cost, resolution (R ∼ 350), high throughput, long slit spectrograph covering visible (4000-8000 Å) wavelengths.The has been developed for fully robotic operation with Liverpool Telescope (La Palma).The primary aim is to provide rapid spectral classification faint (V 20) transient objects detected by projects such as Gaia, iPTF (intermediate Palomar Transient Factory), LOFAR, and variety energy satellites.The design employs volume phase holographic (VPH)...
Abstract This paper presents the first plasmid DNA irradiations carried out with Very High Energy Electrons (VHEE) over 100–200 MeV at CLEAR user facility CERN to determine Relative Biological Effectiveness (RBE) of VHEE. damage yields were measured in dry and aqueous environments that ~ 99% total breaks caused by indirect effects, consistent other published measurements for protons photons. Double-Strand Break (DSB) yield was used as biological endpoint RBE calculation, values found be...
We present a multiwavelength analysis of Swift GRB 061007. The 2 m robotic Faulkes Telescope South began observing 137 s after the onset γ-ray emission, when optical counterpart was already decaying from R ~ 10.3 mag, and continued for next 5.5 hr. These observations begin during final flare continue through beyond long, soft tail emission whose flux shows an underlying simple power-law decay identical to that seen at X-ray wavelengths, with temporal slope α 1.7 (F ∝ t-α). This remarkably in...
We present a detailed study of the prompt and afterglow emission from Swift GRB 061126 using BAT, XRT, UVOT data multi-color optical imaging ten ground-based telescopes. was long burst (T_90=191 s) with four overlapping peaks in its gamma-ray light curve. The X-ray afterglow, observed 26 min to 20 days after burst, shows simple power-law decay alpha_X=1.290 \pm 0.008. Optical observations presented here cover time range 258 s (Faulkes Telescope North) 15 (Gemini burst; rate steep-to-shallow...
We present ground-based and HST optical observations of the transients (OTs) long-duration Gamma Ray Bursts (GRBs) 060729 090618, both at a redshift z = 0.54. For GRB 060729, bumps are seen in light curves (LCs), late-time broadband spectral energy distributions (SEDs) OT resemble those local type Ic supernovae (SNe). dense sampling our has allowed us to detect well-defined LCs, as well change colour, that indicative coming from core-collapse SN. The accompanying SNe for events individually...
Understanding the origin and diversity of emission processes responsible for Gamma-ray Bursts (GRBs) remains a pressing challenge. While prompt contemporaneous panchromatic observations have potential to test predictions internal-external shock model, extensive multiband imaging has been conducted only few GRBs. We present rich, early-time, datasets two \swift\ events, GRB 110205A 110213A. The former shows optical since early stages phase, followed by steep rising in flux up ~1000s after...
Context . Gamma-ray bursts (GRBs) are ideal probes of the Universe at high redshift (ɀ), pinpointing locations earliest star-forming galaxies and providing bright backlights with simple featureless power-law spectra that can be used to spectrally fingerprint intergalactic medium host galaxy during period reionization. Future missions such as Gamow Explorer (hereafter Gamow) being proposed unlock this potential by increasing rate identification high-ɀ (ɀ > 5) GRBs in order rapidly trigger...
Executive Summary Rock thin section analysis and interpretation are important processes in understanding formations. This study shows a new quantitative system to automatically search through thousands of legacy images their associated metadata find the closest match an unlabeled sample. The utilizes image-processing neural-network-based encodings build database. Using this, it is possible utilize existing data as guide interpret samples. advantage that for sections does not need be...
We have generated a series of composite quasi-stellar object (QSO) spectra using over 22 000 individual low-resolution (∼8-Å) QSO obtained from the 2dF (18.25 bJ 20.85) and 6dF (16bJ≤18.25) Redshift Surveys. The large size catalogue has enabled us to construct in relatively narrow redshift (Δz = 0.25) absolute magnitude (ΔMB 0.5) bins. median number QSOs each spectrum is ∼200, yielding typical signal-to-noise ratios ∼100. For given interval, cover factor 25 luminosity. luminosity, many major...
In this paper we present a clustering analysis of QSOs over the redshift range z=0.3–2.9. We use sample 10 558 taken from preliminary data release catalogue 2dF QSO Redshift Survey (2QZ). The two-point redshift-space correlation function QSOs, ξQ(s), is shown to follow power law on scales s≃1–35 h−1 Mpc. Fitting form ξQ(s)=(s/s0)−γ averaged interval 0.3<z≤2.9, find s0=3.99−0.34+0.28 Mpc and γ=1.58−0.09+0.10 for an Einstein–de Sitter cosmology. effect significant cosmological constant, λ0,...
The supernova SN 2006aj associated with GRB 060218 is the second-closest GRB-SN observed to date (). We present Very Large Telescope, Liverpool and Katzman Automatic Imaging Telescope multi-color photometry of 2006aj. This found be subluminous rapidly evolving. Its early light curve includes an additional wavelength-dependent component, which can interpreted as shock break-out. compare photometric evolution multi-band curves corresponding properties sample more than 10 GRB-SNe precisely...