A5084696446- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Nuclear Physics and Applications
- Scientific Research and Discoveries
- Particle Accelerators and Free-Electron Lasers
- History and Developments in Astronomy
- Spectroscopy and Laser Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Particle physics theoretical and experimental studies
- Advanced X-ray Imaging Techniques
- Calibration and Measurement Techniques
- Cultural Heritage Management and Preservation
- Scientific Measurement and Uncertainty Evaluation
University of Edinburgh
2016-2025
Royal Observatory
2015-2024
Scottish Universities Physics Alliance
2011-2022
Lawrence Berkeley National Laboratory
2020-2022
UK Astronomy Technology Centre
1996-2019
Heidelberg University
2019
Centre National de la Recherche Scientifique
2019
Aix-Marseille Université
2019
Netherlands Institute for Radio Astronomy
2019
Centro de Astrobiología
2019
Context.The infrared wide-field camera (WFCAM) is now in operation on the 3.8 m UK Infrared Telescope Mauna Kea. WFCAM currently has fastest survey speed of any world, and combined with generous allocations telescope time, will produce deep maps sky from Z to K band. The data a set public surveys, known as UKIDSS, be initially available astronomers ESO member states, later world.
The UKIDSS Galactic Plane Survey (GPS) is one of the five near infrared Public Legacy Surveys that are being undertaken by consortium, using Wide Field Camera on United Kingdom Infrared Telescope. It surveying 1868 sq.deg. northern and equatorial plane at latitudes -5<b></b>
We describe the WFCAM Science Archive, which is primary point of access for users data from wide-field infrared camera on United Kingdom Infrared Telescope (UKIRT), especially science catalogue products UKIRT Deep Sky Survey. database design with emphasis those aspects system that enable to fully exploit survey sets in a variety different ways. give details database-driven curation applications take standard nightly pipeline-processed and calibrated files production science-ready sets....
The 60-μm luminosity function for galaxies detected by IRAS is determined from a compilation of samples with highly complete redshift information totalling 2818 galaxies, including the new QMC–Cambridge–Durham survey and many nearby, low-luminosity galaxies. We use clustering-independent maximum likelihood methods throughout. A non-parametric estimator used to determine shape function, best parameter set found suitable analytic form. find be well described Gaussian dependence on...
I discuss evidence concerning the relative occurrence of narrow-lined and broad-lined active galactic nuclei (AGN), in optical, IR, X-ray, radio-selected samples. Both AGN reddened occur more frequently at lower source powers. There is marginal that were common past. Narrow-lined objects have weaker [O III] a given radio power. These data are inconsistent with simplest 'unified scheme' where similar thick molecular torus surrounds all AGN, modification, geometrical thickness function A...
We present a systematic search for changing-look quasars based on repeat photometry from Sloan Digital Sky Survey (SDSS) and Pan-STARRS1, along with spectra SDSS SDSS-III Baryon Oscillation Spectroscopic Survey. Objects large, |Δg| > 1 mag photometric variations in their light curves are selected as candidates to look changes broad emission line (BEL) features. Out of sample 1011 objects that satisfy our selection criteria have more than one epoch spectroscopy, we find 10 examples variable...
view Abstract Citations (426) References (70) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Obscuration and the various kinds of Seyfert galaxies. Lawrence, A. ; Elvis, M. Two samples galaxies are used to investigate classification these A complete X-ray selected sample 16 active spirals is defined luminosities axial ratio parent galaxy given. The data suggest strongly that obscuration occurs in broad emission line region, which has a flattened...
We have modelled the spectral energy distributions of 13 HDF galaxies reliably detected by ISO. For 2 emission ISO is consistent with being starlight or infrared 'cirrus' in galaxies. remaining 11 there a clear mid-infrared excess, which we interpret as from dust associated strong starburst. 10 these are spirals interacting pairs, while one an elliptical prominent nucleus and broad lines. give new discussion how star formation rate can be deduced far luminosity derive rates for 8-1000 $\phi...
By combining complementary monitoring observations spanning long, medium and short time scales, we have constructed power spectral densities (PSDs) of six Seyfert~1 galaxies. These PSDs span $\gtrsim$4 orders magnitude in temporal frequency, sampling variations on scales ranging from tens minutes to over a year. In at least four cases, the PSD shows "break," significant departure law, typically order few days. This is similar behavior Galactic X-ray binaries (XRBs), lower mass compact...
This paper defines the UKIRT Infrared Deep Sky Survey (UKIDSS) Early Data Release (EDR). UKIDSS is a set of five large near-infrared surveys being undertaken with United Kingdom Telescope Wide Field Camera (WFCAM). The programme began in 2005 May and has an expected duration 7 yr. Each survey uses some or all broad-band filter complement ZY JHK. EDR first public release data to European Southern Observatory (ESO) community. All worldwide releases occur after delay 18 months from ESO release....
We present the Pan-STARRS1 discovery of long-lived and blue transient PS1-11af, which was also detected by Galaxy Evolution Explorer with coordinated observations in near-ultraviolet (NUV) band. PS1-11af is associated nucleus an early type galaxy at redshift z = 0.4046 that exhibits no evidence for star formation or active galactic activity. Four epochs spectroscopy reveal a pair broad absorption features UV on otherwise featureless spectra. Despite superficial similarity these to P-Cygni...
We describe the VISTA Science Archive (VSA) and its first public release of data from five six surveys. The VSA exists to support surveys through their lifecycle: Public Survey consortia can use it during quality control assessment survey products before submission ESO Facility (ESO SAF); supports exploitation prior publication SAF; and, subsequently, provides wider community with science tools that complement product repository functionality SAF.
Abstract Active galactic nuclei (AGNs) that show strong rest-frame optical/UV variability in their blue continuum and broad line emission are classified as changing-look AGN, or at higher luminosities, quasars (CLQs). These surprisingly large sometimes rapid transitions challenge accepted models of quasar physics duty cycles, offer several new avenues for study host galaxies, open a wider interpretation the cause differences between narrow-line AGN. To better characterize extreme...
We present optical spectra and light curves for three hydrogen-poor superluminous supernovae followed by the Public ESO Spectroscopic Survey of Transient Objects (PESSTO). Time series spectroscopy from a few days after maximum to 100 d later shows them be fairly typical this class, with dominated Ca ii, Mg Fe Si which evolve slowly over most post-peak photospheric phase. determine bolometric apply simple fitting tools, based on diffusion energy input magnetar spin-down, 56Ni decay, collision...
We critically review the evidence concerning fraction of active galactic nuclei (AGNs) that appear as Type 2 AGNs, carefully distinguishing strict AGNs from both more lightly reddened 1 and low excitation narrow line which may represent a different mode activity. Low-excitation occur predominantly at luminosities; after removing these, true 58% ± 5% all further ∼15%. Radio, IR, volume-limited samples agree in showing no change with luminosity. X-ray do show luminosity; we discuss possible...
This paper defines the UK Infra-Red Telescope (UKIRT) Hemisphere Survey (UHS) and release of remaining ~12,700 sq.deg J-band survey data products. The UHS will provide continuous J K-band coverage in northern hemisphere from a declination 0 deg to 60 by combining existing Large Area Survey, Galactic Plane Clusters conducted under UKIRT Infra-red Deep Sky (UKIDSS) programme with this new additional area not covered UKIDSS. released includes imaging source catalogues over area, which, together...
At 66 Mpc, AT2019qiz is the closest optical tidal disruption event (TDE) to date, with a luminosity intermediate between bulk of population and iPTF16fnl. Its proximity allowed very early detection triggering multiwavelength spectroscopic follow-up well before maximum light. The velocity dispersion host galaxy fits TDE light curve indicate black hole mass $\approx 10^6$ M$_\odot$, disrupting star 1$ M$_\odot$. Comprehensive UV, X-ray data shows that emission dominated by an outflow,...
ABSTRACT With the sample of observed tidal disruption events (TDEs) now reaching several tens, distinct spectroscopic classes have emerged: TDEs with only hydrogen lines (TDE-H), helium (TDE-He), or in combination He ii and often N iii/O iii (TDE-H + He). Here, we model light curves 32 optically bright using Modular Open Source Fitter for Transients (mosfit) to estimate physical orbital properties, look statistical differences between classes. For all types, find a shallow distribution star...