Results for "J. I. Davies"

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Probing the Low Surface Brightness Dwarf Galaxy Population of the Virgo ClusterJul 07 2015We have used public data from the Next Generation Virgo Survey (NGVS) to investigate the dwarf galaxy population of the Virgo cluster beyond what has previously been discovered. We initially mask and smooth the data, and then use the object detection ... More
Searching for tidal tails - investigating galaxy harassmentJul 05 2007Galaxy harassment has been proposed as a physical process that morphologically transforms low surface density disc galaxies into dwarf elliptical galaxies in clusters. It has been used to link the observed very different morphology of distant cluster ... More
Automated detection of very Low Surface Brightness galaxies in the Virgo ClusterApr 23 2018We report the automatic detection of a new sample of very low surface brightness (LSB) galaxies, likely members of the Virgo cluster. We introduce our new software, {\tt DeepScan}, that has been designed specifically to detect extended LSB features automatically ... More
Investigating the central engine and excitation mechanisms of ultraluminous infrared galaxies: near infrared spectroscopyJun 04 2001We present NIR observations of a sample of mainly interacting ULIRGs, comprising H and K band spectra. Our main aims are to investigate the power source of these extremely luminous objects and the various excitation mechanisms of the strong molecular ... More
Diffraction Limited Imaging of High Redshift Galaxies with Adaptive OpticsOct 06 2000The major cornerstone of future ground-based astronomy is imaging and spectroscopy at the diffraction limit using adaptive optics. To exploit the potential of current AO systems, we have begun a survey around bright stars to study intermediate redshift ... More
The Nuclear Gas Dynamics and Star Formation of Markarian 231Jun 15 2004We report adaptive optics H- and K-band spectroscopy of the inner few arcsec of the luminous merger/ULIRG/QSO Mkn231, at spatial resolutions as small as 0.085". For the first time we have been able to resolve the active star forming region close to the ... More
The dwarf low surface brightness population in different environments of the Local UniverseJul 27 2007The nature of the dwarf galaxy population as a function of location in the cluster and within different environments is investigated. We have previously described the results of a search for low surface brightness objects in data drawn from an East-West ... More
The Collimated Wind in NGC 253Feb 04 2003Near-infrared Fabry-Perot imaging has revealed H2 emission extended to about 130 pc from the disk of NGC 253. It is closely related to the hot plasma observed in soft X-rays: filamentary H2 features are found at the edges of the hot plasma. These are ... More
Star Formation and Dynamics in the nuclei of AGNApr 15 2004Using adaptive optics on Keck and the VLT in the H- and K-bands, we have begun a project to probe the dynamics and star formation around AGN on scales of 0.1arcsec. The stellar content of the nucleus is traced through the 2.29micron CO2-0 and 1.62micron ... More
Star Formation in the Circumnuclear Environment of NGC1068Jun 25 1998We present near-infrared emission line images of the circumnuclear ring in NGC1068. We have measured the Br_gamma fluxes in a number of star forming complexes and derived extinctions for each of these by comparison with H_alpha. We investigate the star ... More
SCUBA imaging of NGC 7331 dust ringJun 29 1998We present observations of the spiral galaxy NGC 7331 using the Sub-millimetre Common User Bolometer Array (SCUBA) on the James Clark Maxwell Telescope. We have detected a dust ring of 45 arcsec radius (3.3 kpc) at wavelengths of 450 and 850-micron. The ... More
The Arecibo Galaxy Environment Survey V : The Virgo Cluster (I)Mar 14 2012We present 21 cm observations of a 10 $\times$ 2 degree region in the Virgo cluster, obtained as part of the Arecibo Galaxy Environment Survey. 289 sources are detected over the full redshift range (-2,000 $<$ $v$$_{hel}$ $<$ + 20,000 km/s) with 95 belonging ... More
How effective is harassment on infalling late-type dwarfs?Apr 26 2010A new harassment model is presented that models the complex, and dynamical tidal field of a Virgo like galaxy cluster. The model is applied to small, late-type dwarf disc galaxies (of substantially lower mass than in previous harassment simulations) as ... More
Monte Carlo Predictions of Far-Infrared Emission from Spiral GalaxiesMay 05 2000We present simulations of Far Infrared (FIR) emission by dust in spiral galaxies, based on the Monte Carlo radiative transfer code of Bianchi, Ferrara & Giovanardi (1996). The radiative transfer is carried out at several wavelength in the Ultraviolet, ... More
A method to remove residual OH emission from near infrared spectraDec 11 2006I present a technique to remove the residual OH airglow emission from near infrared spectra. Historically, the need to subtract out the strong and variable OH airglow emission lines from 1-2.5um spectra has imposed severe restrictions on observational ... More
Studies of the association of faint blue and luminous galaxies using the Hitchhiker parallel cameraJun 21 1996At B magnitudes >~ 24 there is a well-known excess of galaxies (compared to standard models) which is probably due to an (evolving) population of sub-L* galaxies at moderate redshifts (<~ 0.4). One particular hypothesis which is hard to test directly ... More
Diffuse far-infrared and ultraviolet emission in the NGC4435/4438 system: tidal stream or Galactic cirrus?Jan 06 2010We report the discovery of diffuse far-infrared and far-ultraviolet emission projected near the interacting pair NGC4435/4438, in the Virgo cluster. This feature spatially coincides with a well known low surface-brightness optical plume, usually interpreted ... More
The existence and detection of optically dark galaxies by 21cm surveysSep 27 2006One explanation for the disparity between Cold Dark Matter (CDM) predictions of galaxy numbers and observations could be that there are numerous dark galaxies in the Universe. These galaxies may still contain baryons, but no stars, and may be detectable ... More
The Low Surface Brightness Extent of the Fornax ClusterMay 05 2000We have used a large format CCD camera to survey the nearby Fornax cluster and its immediate environment for low luminosity low surface brightness galaxies. Recent observations indicate that these are the most dark matter dominated galaxies known and ... More
The Mid-infrared Emission of Narrow-Line Active Galactic Nuclei: Star-Formation, Nuclear Activity and two populations revealed by WISESep 13 2013We explore the nature of the long-wavelength mid-infrared (MIR) emission of a sample of 13000 local Type II (narrow-line) Active Galactic Nuclei (AGNs) from the Sloan Digital Sky Survey (SDSS) using 12 and 22 micron photometry from the WISE all-sky survey. ... More
The Deflection of the Two Interacting Coronal Mass Ejections of 2010 May 23-24 as Revealed by Combined In situ Measurements and Heliospheric ImagingSep 11 2012In 2010 May 23-24, SDO observed the launch of two successive coronal mass ejections (CMEs), which were subsequently tracked by the SECCHI suite onboard STEREO. Using the COR2 coronagraphs and the heliospheric imagers (HIs), the initial direction of both ... More
Determining the azimuthal properties of coronal mass ejections from multi-spacecraft remote-sensing observations with stereo secchiApr 06 2010We discuss how simultaneous observations by multiple heliospheric imagers can provide some important information about the azimuthal properties of Coronal Mass Ejections (CMEs) in the heliosphere. We propose two simple models of CME geometry that can ... More
The quenching of star formation in accretion-driven clumpy turbulent tori of active galactic nucleiMay 31 2013Galactic gas-gas collisions involving a turbulent multiphase ISM share common ISM properties: dense extraplanar gas visible in CO, large linewidths (>= 50 km/s), strong mid-infrared H_2 line emission, low star formation activity, and strong radio continuum ... More
Quantum State Spectroscopy of Atom-Cavity SystemsSep 27 2018In this work we explore the nature of quantum correlations between two-level atoms (or qubits) and a single mode of a quantum field in phase space. Similar to time-frequency plots, we introduce the notion of a quantum state spectrogram to allow for the ... More
The supermassive black hole in NGC4486a detected with SINFONI at the VLTMay 12 2007The near-infrared integral field spectrograph SINFONI at the ESO VLT opens a new window for the study of central supermassive black holes. With a near-IR spatial resolution similar to HST optical and the ability to penetrate dust it provides the possibility ... More
SINFONI adaptive optics integral field spectroscopy of the Circinus GalaxyApr 13 2006Aims. To investigate the star formation activity and the gas and stellar dynamics on scales of a few parsecs in the nucleus of the Circinus Galaxy. Methods.Using the adaptive optics near infrared integral field spectrometer SINFONI on the VLT, we have ... More
Arp220: extinction and merger-induced star formationFeb 09 2011We analyse new spatially resolved integral field spectroscopic H- and K-band data at a resolution of 0.3arcsec (100pc) and re-analyse interferometric CO(2-1) line observations of the prototypical merging system Arp220. We find that the majority of the ... More
The role of cold gas and environment on the stellar mass - metallicity relation of nearby galaxiesJul 17 2012We investigate the relationship between stellar mass, metallicity and gas content for a magnitude- and volume-limited sample of 260 nearby late-type galaxies in different environments, from isolated galaxies to Virgo cluster members. We derive oxygen ... More
Two Separate Outflows in the Dual Supermassive Black Hole System NGC 6240Apr 18 2018Theoretical models and numerical simulations have established a framework of galaxy evolution in which galaxies merge and create dual supermassive black holes (with separations of one to ten kiloparsecs), which eventually sink into the centre of the merger ... More
The Arecibo Galaxy Environment Survey VI : The Virgo Cluster (II)Sep 19 2012We present 21 cm observations of a 5 x degree region in the Virgo cluster, obtained as part of the Arecibo Galaxy Environment Survey. 13 cluster members are detected, together with 36 objects in the background. We compare and contrast the results from ... More
The Arecibo Galaxy Environment Survey VII : A Dense Filament With Extremely Long HI StreamsJun 30 2014We present completed observations of the NGC 7448 galaxy group and background volume as part of the blind neutral hydrogen Arecibo Galaxy Environment Survey (AGES). Our observations cover a region spanning 5x4 degrees, over a redshift range of approximately ... More
Near IR diffraction-limited integral-field SINFONI spectroscopy of the Circinus galaxyAug 19 2005Using the adaptive optics assisted near infrared integral field spectrometer SINFONI on the VLT, we have obtained observations of the Circinus galaxy on parsec scales. The morphologies of the H_2(1-0)S(1) 2.12um and Br_gamma 2.17um emission lines are ... More
Accounting for anisoplanatic point spread function in deep wide-field adaptive optics imagesApr 21 2005In this paper we present the approach we have used to determine and account for the anisoplanatic point spread function (PSF) in deep adaptive optics (AO) images for the Survey of a Wide Area with NACO (SWAN) at the ESO VLT. The survey comprises adaptive ... More
The MICADO first light imager for ELT: its astrometric performanceJul 19 2018We report on our ongoing efforts to ensure that the MICADO NIR imager reaches differential absolute (often abbreviated: relative) astrometric performance limited by the SNR of typical observations. The exceptional 39m diameter collecting area in combination ... More
Optical/near-infrared colours of early-type galaxies and constraints on their star formation historiesDec 12 2005(abridged) We introduce and discuss the properties of a theoretical (B-K)-(J-K) integrated colour diagram for single-age, single-metallicity stellar populations. This combination of integrated colours is able to largely disentangle the well known age-metallicity ... More
Starburst-AGN mixing: II. Optically-selected active galaxiesAug 25 2014We use 4 galaxies from the Calar Alto Legacy Integral Field Area (CALIFA) survey with clear signs of accretion onto supermassive black holes to investigate the relative contribution of star-formation and active galactic nucleus (AGN) activity to the line-emission ... More
Measuring the Absolute Height and Profile of the Mesospheric Sodium Layer using a Continuous Wave LaserMar 13 2003Mar 13 2003We have developed and tested a novel method, based on LIDAR, of measuring the height and profile of the mesospheric sodium layer using a continuous wave laser. It is more efficient than classical LIDAR as the laser is on for 50% of the time, and so can ... More
The supermassive black hole of Fornax ASep 03 2008The radio galaxy Fornax A (NGC 1316) is a prominent merger remnant in the outskirts of the Fornax cluster. Its giant radio lobes suggest the presence of a powerful AGN and thus a central supermassive black hole (SMBH). We present high-resolution adaptive ... More
An Empirical Determination of the Dust Mass Absorption Coefficient, $κ_{d}$, Using the Herschel Reference SurveyMar 15 2016We use the published photometry and spectroscopy of 22 galaxies in the Herschel Reference Survey to determine that the value of the dust mass absorption coefficient $\kappa_{d}$ at a wavelength of 500 $\mu m$ is $\kappa_{500} = 0.051^{+0.070}_{-0.026}\,{\rm ... More
Visualising entanglement in atoms and moleculesSep 14 2018Nov 07 2018In this work we show how new phase space methods lead to a more complete visualisation of quantum states of atoms, and molecules, in ways that are not possible with usual orbital methods. This method allows us to display quantum correlations (entanglement) ... More
Attack of the Flying Snakes : Formation of Isolated HI Clouds By Fragmentation of Long StreamsJun 17 2016The existence of long (> 100 kpc) HI streams and small (< 20 kpc) free-floating HI clouds is well-known. While the formation of the streams has been investigated extensively, and the isolated clouds are often purported to be interaction debris, little ... More
Radio Source Extraction with ProFoundFeb 04 2019In the current era of radio astronomy, continuum surveys observe a multitude of objects with complex morphologies and sizes, and are not limited to observing point sources. Typical radio source extraction software generates catalogues by using Gaussian ... More
Reflections and Thoughts on Tired LightJul 23 2007The position of the various tired light theories is reviewed briefly and it is noted that one of the biggest objections to them concerns the mechanism by which light might lose energy as it travels through space. Here some new work relating to the constancy ... More
A review of redshift and its interpretation in cosmology and astrophysicsJun 25 2008May 26 2011This article has been withdrawn by arXiv administrators due to excessive unattributed and verbatim text overlap with the pre-existing Wikipedia article on redshift
Flame: A Flexible Data Reduction Pipeline for Near-Infrared and Optical SpectroscopyOct 16 2017Jun 28 2018We present flame, a pipeline for reducing spectroscopic observations obtained with multi-slit near-infrared and optical instruments. Because of its flexible design, flame can be easily applied to data obtained with a wide variety of spectrographs. The ... More
Spectral Stability of the Neumann LaplacianJun 19 2001We prove the equivalence of Hardy- and Sobolev-type inequalities, certain uniform bounds on the heat kernel and some spectral regularity properties of the Neumann Laplacian associated with an arbitrary region of finite measure in Euclidean space. We also ... More
Masses of the Planetary-Nebula Central Stars in the Galactic Globular-Cluster System from HST Imaging and SpectroscopyJan 12 2017The globular cluster (GC) system of our Galaxy contains four planetary nebulae (PNe): K 648 (or Ps 1) in M15, IRAS 18333-2357 in M22, JaFu 1 in Pal 6, and JaFu 2 in NGC 6441. Because single-star evolution at the low stellar mass of present-epoch GCs was ... More
Adaptive optics near infrared integral field spectroscopy of NGC 2992May 26 2010NGC 2992 is an intermediate Seyfert 1 galaxy showing outflows on kilo parsec scales which might be due either to AGN or starburst activity. We therefore aim at investigating its central region for a putative starburst in the past and its connection to ... More
Galaxy morphology and evolution from SWAN Adaptive Optics imagingJul 11 2006Aug 02 2006We present the results from adaptive optics (AO) assisted imaging in the Ks band of an area of 15 arcmin^2 for SWAN (Survey of a Wide Area with NACO). We derive the high resolution near-IR morphology of ~400 galaxies up to Ks~23.5 in the first 21 SWAN ... More
Update: Accurate Determinations of alpha_s from Realistic Lattice QCDJul 10 2008Dec 14 2008We use lattice QCD simulations, with MILC configurations (including vacuum polarization from u, d, and s quarks), to update our previous determinations of the QCD coupling constant. Our new analysis uses results from 6 different lattice spacings and 12 ... More
The Upsilon spectrum and m_b from full lattice QCDJul 13 2005Sep 16 2005We show results for the Upsilon spectrum calculated in lattice QCD including for the first time vacuum polarization effects for light u and d quarks as well as s quarks. We use gluon field configurations generated by the MILC collaboration. The calculations ... More
Local Swift-BAT active galactic nuclei prefer circumnuclear star formationSep 04 2017We use Herschel data to analyze the size of the far-infrared 70micron emission for z<0.06 local samples of 277 hosts of Swift-BAT selected active galactic nuclei (AGN), and 515 comparison galaxies that are not detected by BAT. For modest far-infrared ... More
Diffuse RRL emission on the Galactic plane between l=36 to 44 degreesDec 11 2009Radio recombination lines (RRLs) can be used to determine the emission measure unambiguously along the Galactic plane. We use the deep (2100s per beam) HI Parkes Zone of Avoidance survey which includes 3 RRLs (H$166\alpha$, H$167\alpha$ and H$168\alpha$) ... More
An E-ELT Case Study: Colour-Magnitude Diagrams of an Old Galaxy in the Virgo ClusterMay 17 2011May 18 2011One of the key science goals for a diffraction limited imager on an Extremely Large Telescope (ELT) is the resolution of individual stars down to faint limits in distant galaxies. The aim of this study is to test the proposed capabilities of a multi-conjugate ... More
Evolution of local Ultraluminous mergers from NIR spectroscopySep 23 2005We present results from our VLT Large Program to study the dynamical evolution of Ultraluminous Infrared Galaxies (ULIRGs). We have so far obtained near-infrared high-resolution ISAAC spectra of 53 local ULIRGs at several merger timescales and 12 Palomar-Green ... More
Contents of LAT97 ProceedingsJan 20 1998May 01 1998We give here the contents pages for the Proceedings of the Lattice '97 conference (15th International Symposium on Lattice Field Theory) that took place in July 1997 in Edinburgh, Scotland. The contents are in html form with clickable links to the papers ... More
The Arecibo Galaxy Environments survey IV: the NGC7448 region and the HI mass functionApr 04 2011In this paper we describe results from the Arecibo Galaxy Environments Survey (AGES). The survey reaches column densities of ~3x10^18 cm^-2 and masses of ~10^7 M_O, over individual regions of order 10 sq deg in size, out to a maximum velocity of 18,000 ... More
Is our Sun a Singleton?Sep 19 2007Most stars are formed in a cluster or association, where the number density of stars can be high. This means that a large fraction of initially-single stars will undergo close encounters with other stars and/or exchange into binaries. We describe how ... More
The Role of Molecular Gas in Obscuring Seyfert Active Galactic NucleiFeb 05 2009Apr 17 2009In a sample of local active galactic nuclei studied at a spatial resolution on the order of 10 pc we show that the interstellar medium traced by the molecular hydrogen v=1-0 S(1) 2.1um line forms a geometrically thick, clumpy disk. The kinematics of the ... More
The life cycle of starbursting circumnuclear gas discsSep 11 2017High-resolution observations from the sub-mm to the optical wavelength regime resolve the central few 100pc region of nearby galaxies in great detail. They reveal a large diversity of features: thick gas and stellar discs, nuclear starbursts, in- and ... More
A precise determination of the Bc mass from dynamical lattice QCDSep 15 2004We perform a precise calculation of the mass of the B_c meson using unquenched configurations from the MILC collaboration including 2+1 flavours of improved staggered quarks. Lattice NRQCD and the Fermilab formalism are used to describe the b and c quarks ... More
The Fornax Spectroscopic Survey I. Survey Strategy and Preliminary Results on the Redshift Distribution of a Complete Sample of Stars and GalaxiesJan 31 2000The Fornax Spectroscopic Survey will use the Two degree Field spectrograph (2dF) of the Anglo-Australian Telescope to obtain spectra for a complete sample of all 14000 objects with 16.5<=Bj<=19.7 in a 12 square degree area centred on the Fornax Cluster. ... More
On the Lack of a Soft X-Ray Excess from Clusters of GalaxiesFeb 24 2006A soft X-ray excess has been claimed to exist in and around a number of galaxy clusters and this emission has been attributed to the warm-hot intergalactic medium that may constitute most of the baryons in the local universe. We have re-examined a study ... More
The Arecibo Galaxy Environment Survey IX: The Isolated Galaxy SampleOct 29 2015We have used the Arecibo L-band Feed Array to map three regions, each of 5 square degrees, around the isolated galaxies NGC 1156, UGC 2082, and NGC 5523. In the vicinity of these galaxies we have detected two dwarf companions: one near UGC 2082, previously ... More
Galaxies in Southern Bright Star Fields I. Near-infrared imagingJun 02 2003As a prerequisite for cosmological studies using adaptive optics techniques, we have begun to identify and characterize faint sources in the vicinity of bright stars at high Galactic latitudes. The initial phase of this work has been a program of K_s ... More
A Complete 2dF Survey of FornaxFeb 09 1998We are using the 2dF spectrograph on the Anglo-Australian Telescope to obtain spectra for a complete sample of all 14000 objects with 16.5<B<19.7 in a 12 square degree area centred on the Fornax cluster. The aims of this project include the study of dwarf ... More
The Fornax Spectroscopic Survey: The Number of Unresolved Compact GalaxiesDec 01 1998We describe a sample of thirteen bright (18.5<Bj<20.1) compact galaxies at low redshift (0.05<z<0.21) behind the Fornax Cluster. These galaxies are unresolved on UK Schmidt sky survey plates, so would be missing from most galaxy catalogs compiled from ... More
Found: High Surface Brightness Compact GalaxiesOct 20 1998We are using the 2dF spectrograph to make a survey of all objects (`stars' and `galaxies') in a 12 sq.deg region towards the Fornax cluster. We have discovered a population of compact emission-line galaxies unresolved on photographic sky survey plates ... More
The GALEX view of the Herschel Reference Survey - Ultraviolet structural properties of nearby galaxiesJun 06 2012We present GALEX far-ultraviolet (FUV) and near-ultraviolet (NUV) as well as SDSS g, r, i photometry and structural parameters for the Herschel Reference Survey, a magnitude-, volume-limited sample of nearby galaxies in different environments. We use ... More
Probing for evolutionary links between local ULIRGs and QSOs from NIR spectroscopyDec 02 2005We present a study of the dynamical evolution of Ultraluminous Infrared Galaxies (ULIRGs), merging galaxies of infrared luminosity >10^12 L_sun. During our Very Large Telescope large program, we have obtained ISAAC near-infrared, high-resolution spectra ... More
Galaxy And Mass Assembly (GAMA): Curation and reanalysis of 16.6k redshifts in the G10/COSMOS regionSep 11 2014Dec 08 2014We discuss the construction of the Galaxy And Mass Assembly (GAMA) 10h region (G10) using publicly available data in the Cosmic Evolution Survey region (COSMOS) in order to extend the GAMA survey to z~1 in a single ~1 deg^2 field. In order to obtain the ... More
Dynamical properties of Ultraluminous Infrared Galaxies. II. Traces of dynamical evolution and end products of local ultraluminous mergersJul 20 2006We present results from our Very Large Telescope large program to study the dynamical evolution of local Ultraluminous Infrared Galaxies (ULIRGs) and QSOs. This paper is the second in a series presenting the stellar kinematics of 54 ULIRGs, derived from ... More
Spatially resolved electron density in the Narrow Line Region of z<0.02 radio AGNsJun 07 2018Although studying outflows in the host galaxies of AGN have become the forefront of extra-galactic astronomy in recent years, estimating the energy associated with these outflows have been a major challenge. Determination of the energy associated with ... More
Gas Rich Galaxies and the HI Mass FunctionSep 06 2001We have developed an automated cross-correlation technique to detect 21cm emission in sample spectra obtained from the HI Parkes All Sky Survey. The initial sample selection was the nearest spectra to 2435 low surface brightness galaxies in the catalogue ... More
Host dynamics and origin of Palomar-Green QSOsOct 24 2006We present host-galaxy velocity dispersions of 12 local (mainly Palomar-Green) quasi-stellar objects (QSOs) measured directly from the stellar CO absorption features in the H band. The mean bulge velocity dispersion of the QSOs in our sample is 186 km/s ... More
X-Ray Absorption from the Milky Way Halo and the Local GroupJul 11 2007Million degree gas is present at near-zero redshift and is due either to a gaseous Galactic Halo or a more diffuse but very massive Local Group medium. We can discriminate between these models because the column densities should depend on location in ... More
Establishing an analogue population for the most distant galaxiesJan 20 2014Lyman break analogues (LBAs) are local galaxies selected to match a more distant (usually z~3) galaxy population in luminosity, UV-spectral slope and physical characteristics, and so provide an accessible laboratory for exploring their properties. However, ... More
Towards the application of the Maximum Entropy Method to finite temperature Upsilon SpectroscopySep 22 2000According to the Narnhofer Thirring Theorem interacting systems at finite temperature cannot be described by particles with a sharp dispersion law. It is therefore mandatory to develop new methods to extract particle masses at finite temperature. The ... More
4MOST Consortium Survey 7: Wide-Area VISTA Extragalactic Survey (WAVES)Mar 06 2019Apr 01 2019WAVES is designed to study the growth of structure, mass and energy on scales of ~1 kpc to ~10 Mpc over a 7 Gyr timeline. On the largest length scales (1-10 Mpc) WAVES will measure the structures defined by groups, filaments and voids, and their emergence ... More
Qualms concerning Tsallis' use of the maximum entropy formalismDec 04 2003Tsallis' 'statistical thermodynamic' formulation of the nonadditive entropy of degree-\alpha is neither correct nor self-consistent.
Additive Entropies of degree-q and the Tsallis EntropyOct 23 2003The Tsallis entropy is shown to be an additive entropy of degree-q that information scientists have been using for almost forty years. Neither is it a unique solution to the nonadditive functional equation from which random entropies are derived. Notions ... More
Comments on Possible Variation of the Universal ConstantsAug 19 2007Discussion of the constancy, or otherwise, of the various so-called universal constants which abound in physics has continued for many years. However, relatively recent observations, which appear to indicate a variation in the value of the fine structure ... More
Heat Flow and Boundary Heterogeneity in Rotating ConvectionAug 31 2017Convection in the metallic cores of terrestrial planets is likely to be subjected to lateral variations in heat flux through the outer boundary imposed by creeping flow in the overlying silicate mantles. Boundary anomalies can significantly influence ... More
Convolution spline approximations for time domain boundary integral equationsMay 03 2013May 07 2014We introduce a new "convolution spline" temporal approximation of time domain boundary integral equations (TDBIEs). It shares some properties of convolution quadrature (CQ), but instead of being based on an underlying ODE solver the approximation is explicitly ... More
4MOST Consortium Survey 7: Wide-Area VISTA Extragalactic Survey (WAVES)Mar 06 2019WAVES is designed to study the growth of structure, mass and energy on scales of ~1 kpc to ~10 Mpc over a 7 Gyr timeline. On the largest length scales (1-10 Mpc) WAVES will measure the structures defined by groups, filaments and voids, and their emergence ... More
Qualms concerning Tsallis's condition of pseudo-additivity as a definition of non-extensivityNov 20 2003The pseudo-additive relation that the Tsallis entropy satisfies has nothing whatsoever to do with the super- and sub- additivity properties of the entropy. The latter properties, like concavity and convexity, are couched in geometric inequalities and ... More
Qualms regarding "Dynamical Foundations of Nonextensive Statistical Mechanics" by C. Beck (cond-mat/0105374)Dec 11 2003The derivation of Student's pdf from superstatistics is a mere coincidence due to the choice of the $\chi^2$ distribution for the inverse temperature which is actually the Maxwell distribution for the speed. The difference between the estimator and the ... More
Optimal forward contract design for inventory: a value-of-waiting analysisApr 09 2019A classical inventory problem is studied from the perspective of embedded options, reducing inventory-management to the design of optimal contracts for forward delivery of stock (commodity). Financial option techniques \`{a} la Black-Scholes are invoked ... More
The Gravitational Red-ShiftMar 18 2004Attention is drawn to the fact that the well-known expression for the red-shift of spectral lines due to a gravitational field may be derived with no recourse to the theory of general relativity. This raises grave doubts over the inclusion of the measurement ... More
Galaxy And Mass Assembly (GAMA): detection of low-surface-brightness galaxies from SDSS dataSep 05 2016We report on a search for new low-surface-brightness galaxies (LSBGs) using Sloan Digital Sky Survey (SDSS) data within the GAMA equatorial fields. The search method consisted of masking objects detected with SDSS photo, combining gri images weighted ... More
The Herschel Virgo Cluster Survey XVI: a cluster inventoryNov 07 2013Herschel FIR observations are used to construct Virgo cluster galaxy luminosity functions and to show that the cluster lacks the very bright and the numerous faint sources detected in field galaxy surveys. The far-infrared SEDs are fitted to obtain dust ... More
[The Impact of Nuclear Star Formation on Gas Inflow to AGNNov 23 2009Our adaptive optics observations of nearby AGN at spatial resolutions as small as 0.085arcsec show strong evidence for recent, but no longer active, nuclear star formation. We begin by describing observations that highlight two contrasting methods by ... More
Dynamical properties of Ultraluminous Infrared Galaxies I: Mass ratio conditions for ULIRG activity in interacting pairsOct 24 2005We present first results from our Very Large Telescope large program to study the dynamical evolution of Ultraluminous Infrared Galaxies (ULIRGs), which are the products of mergers of gas-rich galaxies. The full data set consists of high resolution, long-slit, ... More
Molecular gas in two companion cluster galaxies at z=1.2Jun 05 2018Aug 05 2018We study the molecular gas properties of two star-forming galaxies separated by 6 kpc in the projected space and belonging to a galaxy cluster selected from the Irac Shallow Cluster Survey, at a redshift $z=1.2$, i.e., $\sim2$ Gyr after the cosmic star ... More
Molecular gas streamers feeding and obscuring the active nucleus of NGC1068Sep 29 2008We report the first direct observations of neutral, molecular gas streaming in the nucleus of NGC1068 on scales of <30 pc using SINFONI near-infrared integral field spectroscopy. At a resolution of 0.075", the flux map of 2.12 $\mu$m 1-0 S(1) molecular ... More
A Prediction of the B*_c mass in full lattice QCDSep 24 2009By using the Highly Improved Staggered Quark formalism to handle charm, strange and light valence quarks in full lattice QCD, and NRQCD to handle bottom valence quarks we are able to determine accurately ratios of the B meson vector-pseudoscalar mass ... More
Outflows from AGN: Kinematics of the Narrow-Line and Coronal-Line Regions in Seyfert GalaxiesJul 15 2011As part of an extensive study of the physical properties of active galactic nuclei (AGN) we report high spatial resolution near-IR integral-field spectroscopy of the narrow-line region (NLR) and coronal-line region (CLR) of seven Seyfert galaxies. These ... More
Radiative transfer in disc galaxies -- III. The observed kinematics of dusty disc galaxiesApr 28 2003May 02 2003We present SKIRT (Stellar Kinematics Including Radiative Transfer), a new Monte Carlo radiative transfer code that allows the calculation of the observed stellar kinematics of a dusty galaxy. The code incorporates the effects of both absorption and scattering ... More