Now showing items 1-20 of 33

    • Accretion disc time lag distributions : applying CREAM to simulated AGN light curves 

      Starkey, David; Horne, Keith; Villforth, C. (2016-02-21) - Journal article
      Active galactic nuclei (AGN) vary in their brightness across all wavelengths. Moreover, longer wavelength ultraviolet-optical continuum light curves appear to be delayed with respect to shorter wavelength light curves. A ...
    • Architecture of the Andromeda galaxy : a quantitative analysis of clustering in the inner stellar halo 

      Kafle, P. R.; Sharma, S.; Robotham, A. S. G.; Lewis, G. F.; Driver, S. P. (2017-02) - Journal article
      We present a quantitative measurement of the amount of clustering present in the inner ∼30 kpc of the stellar halo of the Andromeda galaxy (M31). For this we analyse the angular positions and radial velocities of the ...
    • Bayesian bulge-disc decomposition of galaxy images 

      Argyle, J. J.; Méndez-Abreu, J.; Wild, V.; Mortlock, D. J. (2018-09-21) - Journal article
      We introduce PHI, a fully Bayesian Markov chain Monte Carlo algorithm designed for the structural decomposition of galaxy images. PHI uses a triple layer approach to effectively and efficiently explore the complex parameter ...
    • BGLS : a Bayesian formalism for the generalised Lomb-Scargle periodogram 

      Mortier, Annelies; Faria, J.P.; Correia, C.M.; Santerne, A.; Santos, N.C. (2015-01) - Journal article
      Context. Frequency analyses are very important in astronomy today, not least in the ever-growing field of exoplanets, where short-period signals in stellar radial velocity data are investigated. Periodograms are the main ...
    • Dark matter halo properties of GAMA galaxy groups from 100 square degrees of KiDS weak lensing data 

      Viola, M.; Cacciato, M.; Brouwer, M.; Kuijken, K.; Hoekstra, H.; Norberg, P.; Robotham, Aaron Stuart Graham; Van Uitert, E.; Alpaslan, Mehmet; Baldry, I.K.; Choi, A.; De Jong, J.T.A.; Driver, Simon Peter; Erben, T.; Grado, A.; Graham, A.W.; Heymans, C.; Hildebrandt, H.; Hopkins, A.M.; Irisarri, N.; Joachimi, B.; Loveday, J.; Miller, L.; Nakajima, R.; Schneider, P.; Sifón, C.; Verdoes Kleijn, G. (2015-10-01) - Journal article
      The Kilo-Degree Survey is an optical wide-field survey designed to map the matter distribution in the Universe using weak gravitational lensing. In this paper, we use these data to measure the density profiles and masses ...
    • Dependence of GAMA galaxy halo masses on the cosmic web environment from 100 deg2 of KiDS weak lensing data 

      Brouwer, Margot M.; Cacciato, Marcello; Dvornik, Andrej; Eardley, Lizzie; Heymans, Catherine; Hoekstra, Henk; Kuijken, Konrad; McNaught-Roberts, Tamsyn; Sifón, Cristóbal; Viola, Massimo; Alpaslan, Mehmet; Bilicki, Maciej; Bland-Hawthorn, Joss; Brough, Sarah; Choi, Ami; Driver, Simon P.; Erben, Thomas; Grado, Aniello; Hildebrandt, Hendrik; Holwerda, Benne W.; Hopkins, Andrew M.; de Jong, Jelte T. A.; Liske, Jochen; McFarland, John; Nakajima, Reiko; Napolitano, Nicola R.; Norberg, Peder; Peacock, John A.; Radovich, Mario; Robotham, Aaron S. G.; Schneider, Peter; Sikkema, Gert; van Uitert, Edo; Kleijn, Gijs Verdoes; Valentijn, Edwin A. (2016-11-11) - Journal article
      Galaxies and their dark matter haloes are part of a complex network of mass structures, collectively called the cosmic web. Using the tidal tensor prescription these structures can be classified into four cosmic environments: ...
    • Difference image analysis : automatic kernel design using information criteria 

      Bramich, D. M.; Horne, Keith Douglas; Alsubai, K. A.; Bachelet, E.; Mislis, D.; Parley, N. (2016-03-21) - Journal article
      We present a selection of methods for automatically constructing an optimal kernel model for difference image analysis which require very few external parameters to control the kernel design. Each method consists of two ...
    • The dynamical fate of self-gravitating disc fragments after tidal downsizing 

      Forgan, D.; Parker, R.J.; Rice, K. (2015-02-11) - Journal article
      The gravitational instability model of planet/brown dwarf formation proposes that protostellar discs can fragment into objectswith masses above a few Jupiter masses at large semimajor axis. Tidal downsizing may reduce both ...
    • Galaxy And Mass Assembly : automatic morphological classification of galaxies using statistical learning 

      Sreejith, Sreevarsha; Pereverzyev Jr, Sergiy; Kelvin, Lee S; Marleau, Francine R; Haltmeier, Markus; Ebner, Judith; Bland-Hawthorn, Joss; Driver, Simon P; Graham, Alister W; Holwerda, Benne W; Hopkins, Andrew M; Liske, Jochen; Loveday, Jon; Moffett, Amanda J; Pimbblet, Kevin A; Taylor, Edward N; Wang, Lingyu; Wright, Angus H (2018-03) - Journal article
      We apply four statistical learning methods to a sample of 7941 galaxies (z < 0.06) from the Galaxy And Mass Assembly survey to test the feasibility of using automated algorithms to classify galaxies. Using 10 features ...
    • GAMA/H-ATLAS: common star formation rate indicators and their dependence on galaxy physical parameters 

      Wang, L.; Norberg, P.; Gunawardhana, M. L. P.; Heinis, S.; Baldry, I. K.; Bland-Hawthorn, J.; Bourne, N.; Brough, S.; Brown, M. J. I.; Cluver, M. E.; Cooray, A.; da Cunha, E.; Driver, S. P.; Dunne, L.; Dye, S.; Eales, S.; Grootes, M. W.; Holwerda, B. W.; Hopkins, A. M.; Ibar, E.; Ivison, R.; Lacey, C.; Lara-Lopez, M. A.; Loveday, J.; Maddox, S. J.; Michałowski, M. J.; Oteo, I.; Owers, M. S.; Popescu, C. C.; Smith, D. J. B.; Taylor, E. N.; Tuffs, R. J.; van der Werf, P. (2016-09-11) - Journal article
      We compare common star formation rate (SFR) indicators in the local Universe in the Galaxy and Mass Assembly (GAMA) equatorial fields (~160 deg2), using ultraviolet (UV) photometry from GALEX, far-infrared and sub-millimetre ...
    • H-ATLAS/GAMA and HeViCS - dusty early-type galaxies in different environments 

      Agius, N.K.; di Serego Alighieri, S.; Viaene, S.; Baes, M.; Sansom, A.E.; Bourne, N.; Bland-Hawthorn, J.; Brough, S.; Davis, T.A.; De Looze, I.; Driver, Simon Peter; Dunne, L.; Dye, S.; Eales, S.A.; Hughes, T.M.; Ivison, R.J.; Kelvin, Lee Steven; Maddox, S.; Mahajan, S.; Pappalardo, C.; Robotham, Aaron Stuart Graham; Rowlands, Kate Elizabeth; Temi, P.; Valiante, E. (2015-08-21) - Journal article
      The Herschel Space Observatory has had a tremendous impact on the study of extragalactic dust. Specifically, early-type galaxies (ETG) have been the focus of several studies. In this paper, we combine results from two ...
    • The HARPS search for southern extra-solar planets : XXXVIII. Bayesian re-analysis of three systems. New super-Earths, unconfirmed signals, and magnetic cycles 

      Díaz, R. F.; Ségransan, D.; Udry, S.; Lovis, C.; Pepe, F.; Dumusque, X.; Marmier, M.; Alonso, R.; Benz, W.; Bouchy, F.; Coffinet, A.; Cameron, Andrew Collier; Deleuil, M.; Figueira, P.; Gillon, M.; Lo Curto, G.; Mayor, M.; Mordasini, C.; Motalebi, F.; Moutou, C.; Pollacco, D.; Pompei, E.; Queloz, D.; Santos, N.; Wyttenbach, A. (2016-01) - Journal article
      We present the analysis of the entire HARPS observations of three stars that host planetary systems: HD 1461, HD 40307, and HD 204313. The data set spans eight years and contains more than 200 nightly averaged velocity ...
    • The Herschel-ATLAS Data Release 1 – II. Multi-wavelength counterparts to submillimetre sources 

      Bourne, N.; Dunne, L.; Maddox, S. J.; Dye, S.; Furlanetto, C.; Hoyos, C.; Smith, D. J. B.; Eales, S.; Smith, M. W. L.; Valiante, E.; Alpaslan, M.; Andrae, E.; Baldry, I. K.; Cluver, M. E.; Cooray, A.; Driver, S. P.; Dunlop, J. S.; Grootes, M. W.; Ivison, R. J.; Jarrett, T. H.; Liske, J.; Madore, B. F.; Popescu, C. C.; Robotham, A. G.; Rowlands, K.; Seibert, M.; Thompson, M. A.; Tuffs, R. J.; Viaene, S.; Wright, A. H. (2016-10-21) - Journal article
      This paper is the second in a pair of papers presenting data release 1 (DR1) of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS), the largest single open-time key project carried out with the Herschel Space ...
    • Herschel-ATLAS/GAMA : SDSS cross-correlation induced by weak lensing 

      González-Nuevo, J.; Lapi, A.; Negrello, M.; Danese, L.; De Zotti, G.; Amber, S.; Baes, M.; Bland-Hawthorn, J.; Bourne, N.; Brough, S.; Bussmann, R.S.; Cai, Z.-Y.; Cooray, A.; Driver, S.P.; Dunne, L.; Dye, S.; Eales, S.; Ibar, E.; Ivison, R.; Liske, J.; Loveday, J.; Maddox, S.; Michalowski, M.J.; Robotham, A.S.G.; Scott, D.; Smith, M.W.L.; Valiante, E.; Xia, J.-Q. (2014-08-11) - Journal article
      We report a highly significant (>10σ) spatial correlation between galaxies with S350μm ≥ 30 mJy detected in the equatorial fields of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) with estimated redshifts ...
    • Hierarchical Bayesian calibration of tidal orbit decay rates among hot Jupiters 

      Collier Cameron, Andrew; Jardine, Moira (2018-05-11) - Journal article
      Transiting hot Jupiters occupy a wedge-shaped region in the mass ratio-orbital separation diagram. Its upper boundary is eroded by tidal spiral-in of massive, close-in planets and is sensitive to the stellar tidal dissipation ...
    • The host galaxies of X-ray selected active galactic nuclei to z = 2.5 : structure, star formation, and their relationships from CANDELS and Herschel/PACS 

      Rosario, D.J.; McIntosh, D.H.; Van Der Wel, A.; Kartaltepe, J.; Lang, P.; Santini, P.; Wuyts, S.; Lutz, D.; Rafelski, M.; Villforth, C.; Alexander, D.M.; Bauer, F.E.; Bell, E.F.; Berta, S.; Brandt, W.N.; Conselice, C.J.; Dekel, A.; Faber, S.M.; Ferguson, H.C.; Genzel, R.; Grogin, N.A.; Kocevski, D.D.; Koekemoer, A.M.; Koo, D.C.; Lotz, J.M.; Magnelli, B.; Maiolino, R.; Mozena, M.; Mullaney, J.R.; Papovich, C.J.; Popesso, P.; Tacconi, L.J.; Trump, J.R.; Avadhuta, S.; Bassett, R.; Bell, A.; Bernyk, M.; Bournaud, F.; Cassata, P.; Cheung, E.; Croton, D.; Donley, J.; Degroot, L.; Guedes, J.; Hathi, N.; Herrington, J.; Hilton, M.; Lai, K.; Lani, C.; Martig, M.; McGrath, E.; Mutch, S.; Mortlock, A.; McPartland, C.; O'Leary, E.; Peth, M.; Pillepich, A.; Poole, G.; Snyder, D.; Straughn, A.; Telford, O.; Tonini, C.; Wandro, P. (2015-01) - Journal article
      We study the relationship between the structure and star formation rate (SFR) of X-ray selected low and moderate luminosity active galactic nuclei (AGNs) in the two Chandra Deep Fields, using Hubble Space Telescope imaging ...
    • The identification of post-starburst galaxies at z~1 using multiwavelength photometry : a spectroscopic verification 

      Maltby, David T.; Almaini, Omar; Wild, Vivienne; Hatch, Nina A.; Hartley, William G.; Simpson, Chris; McLure, Ross J.; Dunlop, James; Rowlands, Kate; Cirasuolo, Michele (2016-06-11) - Journal article
      Despite decades of study, we still do not fully understand why somemassive galaxies abruptly switch off their star formation in the early Universe, and what causes their rapid transition to the red sequence.Post-starburst ...
    • Machine-learning approaches to exoplanet transit detection and candidate validation in wide-field ground-based surveys 

      Schanche, N.; Cameron, A. Collier; Hébrard, G.; Nielsen, L.; Triaud, A. H. M. J.; Almenara, J. M.; Alsubai, K. A.; Anderson, D. R.; Armstrong, D. J.; Barros, S. C. C.; Bouchy, F.; Boumis, P.; Brown, D. J. A.; Faedi, F.; Hay, K.; Hebb, L.; Kiefer, F.; Mancini, L.; Maxted, P. F. L.; Palle, E.; Pollacco, D. L.; Queloz, D.; Smalley, B.; Udry, S.; West, R.; Wheatley, P. J. (2018-11-22) - Journal article
      Since the start of the Wide Angle Search for Planets (WASP) program, more than 160 transiting exoplanets have been discovered in the WASP data. In the past, possible transit-like events identified by the WASP pipeline have ...
    • The masses of satellites in GAMA galaxy groups from 100 square degrees of KiDS weak lensing data 

      Sifón, Cristóbal; Cacciato, Marcello; Hoekstra, Henk; Brouwer, Margot; Uitert, Edo van; Viola, Massimo; Baldry, Ivan; Brough, Sarah; Brown, Michael J. I.; Choi, Ami; Driver, Simon P.; Erben, Thomas; Grado, Aniello; Heymans, Catherine; Hildebrandt, Hendrik; Joachimi, Benjamin; Jong, Jelte T. A. de; Kuijken, Konrad; McFarland, John; Miller, Lance; Nakajima, Reiko; Napolitano, Nicola; Norberg, Peder; Robotham, Aaron S. G.; Schneider, Peter; Kleijn, Gijs Verdoes (2015-12-21) - Journal article
      We use the first 100 deg2 of overlap between the Kilo-Degree Survey and the Galaxy And Mass Assembly survey to determine the average galaxy halo mass of ∼10 000 spectroscopically confirmed satellite galaxies in massive (M ...
    • The need for speed : escape velocity and dynamical mass measurements of the Andromeda galaxy 

      Kafle, Prajwal R.; Sharma, Sanjib; Lewis, Geraint F.; Robotham, Aaron S. G.; Driver, Simon P. (2018-01-10) - Journal article
      Our nearest large cosmological neighbour, the Andromeda galaxy (M31), is a dynamical system, and an accurate measurement of its total mass is central to our understanding of its assembly history, the life-cycles of its ...