Now showing items 1-20 of 36

    • 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 ...
    • Clustering-based redshift estimation : application to VIPERS/CFHTLS 

      Scottez, V.; Mellier, Y.; Granett, B. R.; Moutard, T.; Kilbinger, M.; Scodeggio, M.; Garilli, B.; Bolzonella, M.; de la Torre, S.; Guzzo, L.; Abbas, U.; Adami, C.; Arnouts, S.; Bottini, D.; Branchini, E.; Cappi, A.; Cucciati, O.; Davidzon, I.; Fritz, A.; Franzetti, P.; Iovino, A.; Krywult, J.; Le Brun, V.; Le Fèvre, O.; Maccagni, D.; Małek, K.; Marulli, F.; Polletta, M.; Pollo, A.; Tasca, L. A. M.; Tojeiro, R.; Vergani, D.; Zanichelli, A.; Bel, J.; Coupon, J.; De Lucia, G.; Ilbert, O.; McCracken, H. J.; Moscardini, L. (2016-07-08) - Journal article
      We explore the accuracy of the clustering-based redshift estimation proposed by Ménard et al. when applied to VIMOS Public Extragalactic Redshift Survey (VIPERS) and Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) ...
    • The data reduction pipeline for the SDSS-IV MaNGA IFU Galaxy Survey 

      Law, David R.; Cherinka, Brian; Yan, Renbin; Andrews, Brett H.; Bershady, Matthew A.; Bizyaev, Dmitry; Blanc, Guillermo A.; Blanton, Michael R.; Bolton, Adam S.; Brownstein, Joel R.; Bundy, Kevin; Chen, Yanmei; Drory, Niv; D'Souza, Richard; Fu, Hai; Jones, Amy; Kauffmann, Guinevere; MacDonald, Nicholas; Masters, Karen L.; Newman, Jeffrey A.; Parejko, John K.; Sánchez-Gallego, José R.; Sánchez, Sebastian F.; Schlegel, David J.; Thomas, Daniel; Wake, David A.; Weijmans, Anne-Marie; Westfall, Kyle B.; Zhang, Kai (2016-10) - Journal article
      Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) is an optical fiber-bundle integral-field unit (IFU) spectroscopic survey that is one of three core programs in the fourth-generation Sloan Digital Sky Survey ...
    • 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 ...
    • Dynamical history of the Local Group in ΛCDM 

      Banik, Indranil; Zhao, Hongsheng (2016-06-21) - Journal article
      The positions and velocities of galaxies in the Local Group (LG) measure the gravitational field within it. This is mostly due to the Milky Way (MW) and Andromeda (M31). We constrain their masses using distance and radial ...
    • Erratum: The escape velocity curve of the Milky Way in modified Newtonian Dynamics 

      Banik, Indranil; Zhao, Hongsheng (2018-08-21) - Journal article
      Small error in equation 11 of the original publication (MNRAS, 473, 419 — 430) which does not affect the original analysis or conclusions as the error is purely typographical.
    • The escape velocity curve of the Milky Way in Modified Newtonian dynamics 

      Banik, Indranil; Zhao, Hongsheng (2018-01) - Journal article
      We determine the escape velocity from the Milky Way (MW) at a range of Galactocentric radii in the context of Modified Newtonian Dynamics (MOND). Due to its non-linear nature, escape is possible if the MW is considered ...
    • Galaxy and mass assembly (GAMA) : AUTOZ spectral redshift measurements, confidence and errors 

      Baldry, I.K.; Alpaslan, M.; Bauer, A.E.; Bland-Hawthorn, J.; Brough, S.; Cluver, M.E.; Croom, S.M.; Davies, L.J.M.; Driver, S.P.; Gunawardhana, M.L.P.; Holwerda, B.W.; Hopkins, A.M.; Kelvin, L.S.; Liske, J.; López-Sánchez, A.R.; Loveday, J.; Norberg, P.; Peacock, J.; Robotham, A.S.G.; Taylor, E.N. (2014-07-01) - Journal article
      The Galaxy And Mass Assembly (GAMA) survey has obtained spectra of over 230 000 targets using the Anglo-Australian Telescope. To homogenize the redshift measurements and improve the reliability, a fully automatic redshift ...
    • Galaxy and Mass Assembly (GAMA) : fine filaments of galaxies detected within voids 

      Alpaslan, Mehmet; Robotham, Aaron S. G.; Obreschkow, Danail; Penny, Samantha; Driver, Simon; Norberg, Peder; Brough, Sarah; Brown, Michael; Cluver, Michelle; Holwerda, Benne; Hopkins, Andrew M.; Kampen, Eelco van; Kelvin, Lee S.; Lara-Lopez, Maritza A.; Liske, Jochen; Loveday, Jon; Mahajan, Smriti; Pimbblet, Kevin (2014-05-01) - Journal article
      Based on data from the Galaxy and Mass Assembly (GAMA) survey, we report on the discovery of structures that we refer to as ‘tendrils’ of galaxies: coherent, thin chains of galaxies that are rooted in filaments and terminate ...
    • 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 HARPS search for southern extra-solar planets. XL. Searching for Neptunes around metal-poor stars 

      Faria, J. P.; Santos, N. C.; Figueira, P.; Mortier, A.; Dumusque, X.; Boisse, I.; Lo Curto, G.; Lovis, C.; Mayor, M.; Melo, C.; Pepe, F.; Queloz, D.; Santerne, A.; Ségransan, D.; Sousa, S. G.; Sozzetti, A.; Udry, S. (2016-05) - Journal article
      Context. As a probe of the metallicity of proto-planetary disks, stellar metallicity is an important ingredient for giant planet formation, most likely through its effect on the timescales in which rocky or icy planet cores ...
    • The HARPS search for southern extra-solar planets. XLIV. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions 

      Udry, S.; Dumusque, X.; Lovis, C.; Ségransan, D.; Diaz, R. F.; Benz, W.; Bouchy, F.; Coffinet, A.; Lo Curto, G.; Mayor, M.; Mordasini, C.; Motalebi, F.; Pepe, F.; Queloz, D.; Santos, N. C.; Wyttenbach, A.; Alonso, R.; Collier Cameron, A.; Deleuil, M.; Figueira, P.; Gillon, M.; Moutou, C.; Pollacco, D.; Pompei, E. (2019-02) - Journal article
      Context. We present radial-velocity measurements of eight stars observed with the HARPS Echelle spectrograph mounted on the 3.6-m telescope in La Silla (ESO, Chile). Data span more than ten years and highlight the long-term ...
    • 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 ...
    • Mass functions, luminosity functions, and completeness measurements from clustering redshifts 

      Bates, Dominic J.; Tojeiro, Rita; Newman, Jeffrey A.; Gonzalez-Perez, Violeta; Comparat, Johan; Schneider, Donald P.; Lima, Marcos; Streblyanska, Alina (2019-07) - Journal article
      This paper presents stellar mass functions and i-band luminosity functions for Sloan Digital Sky Survey (SDSS) galaxies with i < 21 using clustering redshifts. From these measurements, we also compute targeting completeness ...
    • Measuring the electron temperatures of coronal mass ejections with future space-based multi-channel coronagraphs : a numerical test 

      Bemporad, Alessandro; Pagano, Paolo; Giordano, Silvio (2018-11) - Journal article
      Context. The determination from coronagraphic observations of physical parameters of the plasma embedded in coronal mass ejections (CMEs) is of crucial importance for our understanding of the origin and evolution of these ...
    • Observing the formation of flare-driven coronal rain 

      Scullion, E.; Rouppe Van Der Voort, L.; Antolin, P.; Wedemeyer, S.; Vissers, G.; Kontar, E. P.; Gallagher, P. (2016-12-20) - Journal article
      Flare-driven coronal rain can manifest from rapidly cooled plasma condensations near coronal loop-tops in thermally unstable post-flare arcades. We detect 5 phases that characterise the post-flare decay:heating, evaporation, ...
    • OGLE-2014-BLG-1186 : gravitational microlensing providing evidence for a planet orbiting the foreground star or for a close binary source? 

      Dominik, M.; Bachelet, E.; Bozza, V.; Street, R. A.; Han, C.; Hundertmark, M.; Udalski, A.; Bramich, D. M.; Alsubai, K. A.; Calchi Novati, S.; Ciceri, S.; D'Ago, G.; Jaimes, R. Figuera; Haugbølle, T.; Hinse, T. C.; Horne, K.; Jørgensen, U. G.; Juncher, D.; Kains, N.; Korhonen, H.; Mancini, L.; Menzies, J.; Popovas, A.; Rabus, M.; Rahvar, S.; Scarpetta, G.; Schmidt, R.; Skottfelt, J.; Snodgrass, C.; Southworth, J.; Starkey, D.; Steele, I. A.; Surdej, J.; Tsapras, Y.; Wambsganss, J.; Wertz, O.; Pietrukowicz, P.; Szymański, M. K.; Mróz, P.; Skowron, J.; Soszyński, I.; Ulaczyk, K.; Poleski, R.; Wyrzykowski, Ł.; Kozłowski, S. (2019-04-21) - Journal article
      Discussing the particularly long gravitational microlensing event OGLE-2014-BLG-1186 with a time-scale tE ∼ 300 d, we present a methodology for identifying the nature of localised deviations from single-lens point-source ...
    • The optical and NIR luminous energy output of the Universe : the creation and utilisation of a 9 waveband consistent sample of galaxies using UKIDSS and SDSS observations with the GAMA and MGC spectroscopic datasets 

      Hill, David T. (University of St Andrews, 2011-06-24) - Thesis
      Theories of how galaxies form and evolve depend greatly on constraints provided by observations. However, when those observations come from different datasets, systematic offsets may occur. This causes difficulties measuring ...
    • Origin of the Local Group satellite planes 

      Banik, Indranil; O'Ryan, David; Zhao, Hongsheng (2018-07-11) - Journal article
      We attempt to understand the planes of satellite galaxies orbiting the Milky Way (MW) and M31 in the context of Modified Newtonian Dynamics (MOND), which implies a close MW-M31 flyby occurred ≈8 Gyr ago. Using the timing ...