Browsing University of Hertfordshire by Title

Now showing items 9106-9125 of 24062

    • Galactic wind shells and high redshift radio galaxies. On the nature of associated absorbers 

      Krause, M. (2005-06-03)
      A jet is simulated on the background of a galactic wind headed by a radiative bow shock. The wind shell, which is due to the radiative bow shock, is effectively destroyed by the impact of the jet cocoon, thanks to ...

    • Galactic winds - how to launch galactic outflows in typical Lyman-break galaxies 

      von Glasow, W.; Krause, M.~G.~H.; Sommer-Larsen, J.; Burkert, A. (2013-09-11)
      We perform hydrodynamical simulations of a young galactic disc embedded in a hot gaseous halo using parameters typical for Lyman-break galaxies (LBGs). We take into account the (static) gravitational potentials due to a ...

    • The GALAH Survey : Non-LTE departure coefficients for large spectroscopic surveys 

      Amarsi, A. M.; Lind, K.; Osorio, Y.; Nordlander, T.; Bergemann, M.; Reggiani, H.; Wang, E. X.; Buder, S.; Asplund, M.; Barklem, P. S.; Wehrhahn, A.; Skúladóttir, Á.; Kobayashi, C.; Karakas, A. I.; Gao, X. D.; Bland-Hawthorn, J.; Silva, G. M. De; Kos, J.; Lewis, G. F.; Martell, S. L.; Sharma, S.; Simpson, J. D.; Zucker, D. B.; Čotar, K.; Horner, J.; collaboration, the GALAH (2020-10-06)
      Massive sets of stellar spectroscopic observations are rapidly becoming available and these can be used to determine the chemical composition and evolution of the Galaxy with unprecedented precision. One of the major ...

    • The GALAH Survey: Chemical tagging and chrono-chemodynamics of accreted halo stars with GALAH+ DR3 and $Gaia$ eDR3 

      Buder, Sven; Lind, Karin; Ness, Melissa K.; Feuillet, Diane K.; Horta, Danny; Monty, Stephanie; Buck, Tobias; Nordlander, Thomas; Bland-Hawthorn, Joss; Casey, Andrew R.; Silva, Gayandhi M. De; D'Orazi, Valentina; Freeman, Ken C.; Hayden, Michael R.; Kos, Janez; Martell, Sarah L.; Lewis, Geraint F.; Lin, Jane; Schlesinger, Katharine J.; Sharma, Sanjib; Simpson, Jeffrey D.; Stello, Dennis; Zucker, Daniel B.; Zwitter, Tomaz; Ciuca, Ioana; Horner, Jonathan; Kobayashi, Chiaki; Ting, Yuan-Sen; Wyse, Rosemary F. G.; Collaboration, The GALAH (2022-02-01)
      Since the advent of $Gaia$ astrometry, it is possible to identify massive accreted systems within the Galaxy through their unique dynamical signatures. One such system, $Gaia$-Sausage-Enceladus (GSE), appears to be an early ...

    • The GALAH+ Survey : Third Data Release 

      Buder, Sven; Sharma, Sanjib; Kos, Janez; Amarsi, Anish M.; Nordlander, Thomas; Lind, Karin; Martell, Sarah L.; Asplund, Martin; Bland-Hawthorn, Joss; Casey, Andrew R.; Silva, Gayandhi M. De; D'Orazi, Valentina; Freeman, Ken C.; Hayden, Michael R.; Lewis, Geraint F.; Lin, Jane; Schlesinger, Katharine J.; Simpson, Jeffrey D.; Stello, Dennis; Zucker, Daniel B.; Zwitter, Tomaz; Beeson, Kevin L.; Buck, Tobias; Casagrande, Luca; Clark, Jake T.; Cotar, Klemen; Costa, Gary S. Da; Grijs, Richard de; Feuillet, Diane; Horner, Jonathan; Kafle, Prajwal R.; Khanna, Shourya; Kobayashi, Chiaki; Liu, Fan; Montet, Benjamin T.; Nandakumar, Govind; Nataf, David M.; Ness, Melissa K.; Spina, Lorenzo; Tepper-Garcia, Thor; Ting, Yuan-Sen; Traven, Gregor; Vogrincic, Rok; Wittenmyer, Robert A.; Wyse, Rosemary F. G.; Zerjal, Marusa; collaboration, the GALAH (2021-05-06)
      The ensemble of chemical element abundance measurements for stars, along with precision distances and orbit properties, provides high-dimensional data to study the evolution of the Milky Way. With this third data release ...

    • GALAPAGOS-C : Analysis of galaxy morphologies using high-performance computing methods 

      Hiemer, Andreas; Barden, Marco; Kelvin, Lee S.; Häußler, Boris; Schindler, Sabine (2014-11-11)
      We present GALAPAGOS-C, a code designed to process a complete set of survey images through automation of source detection (via SEXTRACTOR), postage stamp cutting, object mask preparation, sky background estimation and ...

    • Galaxies in Southern Bright Star Fields: 1 - Near-infrared imaging 

      Baker, A.J.; Davies, R.L.; Lehnert, M.D.; Thatte, N.; Vacca, W.D.; Hainaut, O.R.; Jarvis, M.J.; Miley, G.K.; Rottgering, H.J.A. (2003)

    • Galaxy And Mass Assembly (GAMA) : The 325-MHz Radio Luminosity Function of AGN and Star Forming Galaxies 

      Prescott, Matthew; Mauch, T.; Jarvis, M.J.; McAlpine, K.; Smith, Daniel; Fine, S.; Johnston, R.; Hardcastle, M.J.; Baldry, I. K.; Brough, S.; Brown, M. J. I.; Bremer, M.N.; Driver, S. P.; Hopkins, A. M.; Kelvin, L. S.; Loveday, J.; Norberg, P.; Obreschkow, D.; Sadler, E.M. (2016-03-21)
      Measurement of the evolution of both active galactic nuclei (AGN) and star-formation in galaxies underpins our understanding of galaxy evolution over cosmic time. Radio continuum observations can provide key information ...

    • Galaxy and mass assembly (GAMA) : The wavelength-dependent sizes and profiles of galaxies revealed by MegaMorph 

      Vulcani, Benedetta; Bamford, Steven P.; Häußler, Boris; Vika, Marina; Rojas, Alex L.; Agius, Nicola K.; Baldry, Ivan K.; Bauer, Amanda E.; Brown, Michael J. I.; Driver, Simon; Graham, Alister W.; Kelvin, Lee S.; Liske, Jochen; Loveday, Jon; Popescu, Cristina C.; Robotham, Aaron S. G.; Tuffs, Richard J. (2014-06-21)
      We investigate the relationship between colour and structure within galaxies using a large, volume-limited sample of bright, low-redshift galaxies with optical-near-infrared imaging from the Galaxy AndMass Assembly survey.We ...

    • Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release 

      Driver, S. P.; Hill, D. T.; Kelvin, L. S.; Robotham, A. S. G.; Liske, J.; Norberg, P.; Baldry, I.K.; Bamford, S. P.; Hopkins, A. M.; Loveday, J.; Peacock, J.A.; Andrae, E.; Bland-Hawthorn, J.; Brough, S.; Brown, M. J. I.; Cameron, E.; Ching, J. H. Y.; Colless, M.; Conselice, C. J.; Croom, S. M.; Cross, N.J.G.; De Propris, R.; Dye, S.; Drinkwater, M. J.; Ellis, S.; Graham, Alister W.; Grootes, M. W.; Gunawardhana, M.; Jones, D. H.; van Kampen, E.; Maraston, C.; Nichol, R.C.; Parkinson, H. R.; Phillipps, S.; Pimbblet, K.; Popescu, C. C.; Prescott, M.; Roseboom, I.G.; Sadler, E.M.; Sansom, A. E.; Sharp, R.G.; Smith, Daniel; Taylor, E.; Thomas, D.; Tuffs, R. J.; Wijesinghe, D.; Dunne, L.; Frenk, C. S.; Jarvis, M.J.; Madore, B. F.; Meyer, M. J.; Seibert, M.; Staveley-Smith, L.; Sutherland, W. J.; Warren, S.J. (2011-05)
      The Galaxy and Mass Assembly (GAMA) survey has been operating since 2008 February on the 3.9-m Anglo-Australian Telescope using the AAOmega fibre-fed spectrograph facility to acquire spectra with a resolution of R approximate ...

    • Galaxy cluster X-ray luminosity scaling relations from a representative local sample (REXCESS) 

      Pratt, G.W.; Croston, J.H.; Arnaud, M.; Boehringer, H. (2009)

    • Galaxy Clusters around Radio-loud Active Galactic Nuclei at 1.3 lt z lt 3.2 as seen by Spitzer 

      Wylezalek, D.; Galametz, A.; Stern, D.; Vernet, J.; De Breuck, C.; Seymour, N.; Brodwin, M.; Eisenhardt, P.R.M.; Gonzalez, A.H.; Hatch, N.; Jarvis, M.J.; Rettura, A.; Stanford, S. A.; Stevens, J.A. (2013-05-01)
      We report the first results from the Clusters Around Radio-Loud AGN program, a Cycle 7 and 8 Spitzer Space Telescope snapshot program to investigate the environments of a large sample of obscured and unobscured luminous ...

    • Galaxy clusters at 0.6-z-1.4 in the UKIDSS ultra deep survey early data release 

      van Breukelen, C.; Clewley, L.; Bonfield, D.; Rawlings, S.; Jarvis, M.J.; Barr, J.M.; Foucaud, S.; Almaini, O.; Cirasuolo, M.; Dalton, G.; Dunlop, J.S.; Edge, A.C.; Hirst, P.; McLure, R.J.; Page, M.J.; Sekiguchi, K.; Simpson, C.; Smail, I.; Watson, M. (2006)

    • Galaxy Evolution and the Redshift Desert 

      Kotulla, Ralf Christian (2011-04-26)
      This thesis explores the evolution of galaxies from the onset of star formation shortly after the Big Bang until the present day. Particular emphasis lies on the redshift range z = 1.4 􀀀 2.5, the so-called “redshift ...

    • Galaxy evolution explorer ultraviolet color-magnitude relations and evidence of recent star formation in early-type galaxies 

      Yi, S.K.; Yoon, S.-J.; Lee, Y.-W.; Ree, C.H.; Sohn, Y.-J.; Rey, S.-C.; Rhee, J.; Byun, Y.-I.; Kim, S.-W.; Kaviraj, S.; Deharveng, J.-M.; Boselli, A.; Donas, J.; Malina, R.; Milliard, B.; Rich, R.M.; Salim, S.; Friedman, P.G.; Martin, D.C.; Morrissey, P.; Small, T.; Barlow, T.; Forster, K.; Wyder, T.K.; Lee, J.-W.; Bianchi, L.; Heckman, T.M.; Szalay, A.S.; Jee, M.J.; Jelinsky, P.; Siegmund, O.; Welsh, B.; Madore, B.F.; Neff, S.; Schiminovich, D. (2005-01-20)
      We have used the Galaxy Evolution Explorer UV photometric data to construct a first near-UV (NUV) color-magnitude relation (CMR) for the galaxies preclassified as early-type by Sloan Digital Sky Survey studies. The NUV CMR ...

    • Galaxy Evolution in a z~3 Protocluster 

      Hine, Nancy (2017-07-27)
      Environment is known to have a significant impact on the evolution of galaxies. This is most evident in the local Universe, where the oldest and most massive galaxies are found at the of massive galaxy clusters. Current ...

    • Galaxy evolution in Abell 85. I: Cluster substructure and environmental effects on the blue galaxy population 

      Bravo-Alfaro, H.; Caretta, C.A.; Lobo, C.; Durret, F.; Scott, T.C. (2009)

    • Galaxy formation: When the wind blows 

      Geach, J.~E. (2015-03-25)

    • The galaxy group NGC 507: newly detected AGN remnant plasma transported by sloshing 

      Brienza, M.; Lovisari, L.; Rajpurohit, K.; Bonafede, A.; Gastaldello, F.; Murgia, M.; Vazza, F.; Bonnassieux, E.; Botteon, A.; Brunetti, G.; Drabent, A.; Hardcastle, M. J.; Pasini, T.; Riseley, C. J.; Röttgering, H. J. A.; Shimwell, T.; Simionescu, A.; Weeren, R. J. van (2022-05-06)
      Jets from active galactic nuclei (AGN) are known to recurrently enrich their surrounding medium with mildly-relativistic particles and magnetic fields. Here, we present a detailed multi-frequency analysis of the nearby ...

    • Galaxy merger histories and the role of merging in driving star formation at z>1 

      Kaviraj, S.; Devriendt, J.; Dubois, Y.; Slyz, A.; Welker, C.; Pichon, C.; Peirani, S.; Borgne, D. Le (2015-09-21)
      We use Horizon-AGN, a hydrodynamical cosmological simulation, to explore the role of mergers in the evolution of massive (M > 10^10 MSun) galaxies around the epoch of peak cosmic star formation (1zR(4:1 3 are 'blue' (i.e. ...