Browsing University of Hertfordshire by Title

Now showing items 8229-8248 of 24235

    • Extreme infrared variables from UKIDSS-I : A concentration in star-forming regions 

      Contreras Peña, C.; Lucas, P.W.; Froebrich, D.; Kumar, M.S.N.; Goldstein, J.; Drew, J.E.; Adamson, A.J.; Davis, C.J.; Barentsen, Geert; Wright, N.J. (2014-04-01)
      We present initial results of the first panoramic search for high-amplitude near-infrared variability in theGalactic plane.We analyse the widely separated two-epoch K-band photometry in the fifth and seventh data releases ...

    • The extreme phronesis of Percy Cerutty : A narrativized life history of a legendary sports coach 

      Turner, David (2017-09-23)
      This paper presents and interprets a narrativized coaching life history of the Australian athletics coach Percy Cerutty (1895-1975). Through a relational process of self-improvement and practical wisdom sometimes called ...

    • Extreme radio flares and associated X-ray variability from young stellar objects in the Orion Nebula Cluster 

      Forbrich, Jan; Reid, Mark J.; Menten, Karl M.; Rivilla, Victor M.; Wolk, Scott J.; Rau, Urvashi; Chandler, Claire J. (2017-07-27)
      Young stellar objects are known to exhibit strong radio variability on timescales of weeks to months, and a few reports have documented extreme radio flares with at least an order of magnitude change in flux density on ...

    • The extreme red afterglow of GRB 060923: distance or dust? 

      Tanvir, N.; Levan, A.; Rol, E.; Starling, R.L.; Gorosabel, J.; Priddey, R.; Malesani, D.; Jakobsson, P.; O'Brien, P.T.; Jaunsen, A.O.; Hjorth, J.; Fynbo, J.; Melandri, A.; Gomboc, A.; Milvang-Jensen, B.; Fruchter, A.S.; Jarvis, M.J.; Fernandes, C.A.C.; Wold, T. (2008)

    • Extreme sensitivity displayed by single-crystal diamond deep ultra-violet photoconductive devices 

      Bevilacqua, Mose; Jackman, Richard B. (2009)
      Deep UV detection using a single crystal diamond (SCD) substrate without a homoepitaxial layer has been demonstrated using a defect passivation treatment. Despite evidence of surface damage on the SCD, the treatments lead ...

    • Extreme star formation in the Milky Way: luminosity distributions of young stellar objects in W49A and W51 

      Eden, D. J.; Moore, T. J. T.; Urquhart, J. S.; Elia, D.; Plume, R.; Konig, C.; Baldeschi, A.; Schisano, E.; Rigby, A. J.; Morgan, L. K.; Thompson, M. A. (2018-07-01)
      We have compared the star-formation properties of the W49A and W51 regions by using far-infrared data from the Herschel infrared Galactic Plane Survey (Hi-GAL) and 850-μm observations from the James Clerk Maxwell Telescope ...

    • An Extreme Starburst in the Core of a Rich Galaxy Cluster at z = 1.7 

      Webb, T.; Noble, A.; DeGroot, A.; Wilson, G.; Muzzin, A.; Bonaventura, N.; Cooper, M.; Delahaye, A.; Foltz, R.; Lidman, C.; Surace, J.; Yee, H.~K.~C.; Chapman, S.; Dunne, L.; Geach, J.; Hayden, B.; Hildebrandt, H.; Huang, J.; Pope, A.; Smith, M.~W.~L.; Perlmutter, S.; Tudorica, A. (2015-08-21)
      We have discovered an optically rich galaxy cluster at z = 1.7089 with star formation occurring in close proximity to the central galaxy. The system, SpARCS104922.6+564032.5, was detected within the Spitzer Adaptation of ...

    • Extremely Faint Blue-tail Stars in Centauri 

      Moehler, S.; Napiwotzki, R.; Sweigart, A.V.; Landsman, S.; Dreizler, S. (2002)

    • Extremely faint blue-tail stars in ω Centauri 

      Moehler, S.; Napiwotzki, R.; Sweigart, A.V.; Landsman, S.; Dreizler, S. (Astronomical Society of the Pacific, 2002)

    • Extremely inefficient star formation in the outer disks of nearby galaxies 

      Bigiel, F.; Leroy, A.; Walter, F.; Blitz, L.; Brinks, E.; de Blok, W.J.G.; Madore, B. (2010)
      We combine data from The H I Nearby Galaxy Survey and the GALEX Nearby Galaxy Survey to study the relationship between atomic hydrogen (H I) and far-ultraviolet (FUV) emission outside the optical radius (r 25) in 17 spiral ...

    • An extremely low gas-to-dust ratio in the dust-lane lenticular galaxy NGC 5485 

      Baes, Maarten; Allaert, Flor; Sarzi, Marc; De Looze, Ilse; Fritz, Jacopo; Gentile, Gianfranco; Hughes, Thomas M.; Puerari, Ivânio; Smith, Matthew W.L.; Viaene, Sébastien (2014-10-11)

    • An extremely luminous panchromatic outburst from the nucleus of a distant galaxy 

      Levan, Andrew; Tanvir, Nial; Cenko, S.B.; Perley, D.A.; Wiersema, K.; Bloom, J.S.; Fruchter, A.S.; Postigo, A.; O'Brien, O.T.; Butler, N.R.; van der Horst, A.J.; Leloudas, G.; Morgan, A.N.; Misra, K.; Bower, G.C.; Farihi, J.; Tunnicliffe, R.L.; Modjaz, M.; Silverman, J.M.; Hjorth, J.; Thone, C.C.; Cucchiara, A.; Ceron, J.M.C.; Castro-Tirado, A.J.; Arnold, J.A.; Bremer, M.; Brodie, J.P.; Carroll, T.; Cooper, M.C.; Curran, P.; Cutri, R.M.; Ehle, J.; Forbes, D.; Fynbo, J.; Gorosabel, J.; Graham, J.; Hoffman, D.I.; Guziy, S.; Jakobsson, Pall; Kamble, A.P.; Kerr, T.H.; Kasliwal, M.M.; Kouveliotou, C.; Kocevski, D.; Law, N.M.; Nugent, P.; Ofek, E.O.; Poznanski, D.; Quimby, R.M.; Rol, E.; Romanowsky, A.J.; Sanchez-Ramirez, R.; Schulze, S.; Singh, N.; Van Spaandonk, Lieke; Starling, R.L.; Strom, R.G.; Tello, J.C.; Vaduvescu, O.; Wheatley, P.J.; Wijers, R.A.M.J.; Winters, J.M.; Xu, D. (2011)
      Variable x-ray and gamma-ray emission is characteristic of the most extreme physical processes in the universe. We present multiwavelength observations of a unique gamma-ray-selected transient detected by the Swift satellite, ...

    • Extremely massive disc galaxies in the nearby Universe form through gas-rich minor mergers 

      Jackson, R. A.; Kaviraj, S.; Martin, G.; Devriendt, J. E. G.; Noakes-Kettel, E. A.; Silk, J.; Ogle, P.; Dubois, Y. (2022-01-14)
      In our hierarchical structure-formation paradigm, the observed morphological evolution of massive galaxies -- from rotationally-supported discs to dispersion-dominated spheroids -- is largely explained via galaxy merging. ...

    • Extremely Metal-poor Stars : IX CS 22949-037 and the Role of Hypernovae 

      Norris, J.E.; Ryan, Sean G.; Beers, T.C.; Ando, H.; Aoki, W. (2002-04)

    • Extremely metal-poor stars from the cosmic dawn in the bulge of the Milky Way 

      Howes, L. M.; Casey, A. R.; Asplund, M.; Keller, S. C.; Yong, D.; Nataf, D. M.; Poleski, R.; Lind, K.; Kobayashi, C.; Owen, C. I.; Ness, M.; Bessell, M. S.; Costa, G. S. Da; Schmidt, B. P.; Tisserand, P.; Udalski, A.; Szymański, M. K.; Soszyński, I.; Pietrzyński, G.; Ulaczyk, K.; Wyrzykowski, Ł.; Pietrukowicz, P.; Skowron, J.; Kozłowski, S.; Mróz, P. (2015-11-26)
      The first stars are predicted to have formed within 200 million years after the Big Bang, initiating the cosmic dawn. A true first star has not yet been discovered, although stars with tiny amounts of elements heavier than ...

    • Extremely Metal-Poor Stars. VIII. High-Resolution, HighSignal-to-Noise Ratio Analysis of Five Stars with [Fe/H][[3.5 

      Norris, J.E.; Ryan, Sean G.; Beers, T.C. (2001-11)

    • The extremely red L dwarf ULAS J222711-004547-dominated by dust 

      Marocco, F.; Day-Jones, A. C.; Lucas, P.W.; Jones, H.R.A.; Smart, R.L.; Zhang, Z. H.; Gomes, J. I.; Burningham, B.; Pinfield, D.J.; Raddi, R.; Smith, Leigh (2014-03)
      We report the discovery of a peculiar L dwarf from the United Kingdom Infrared Deep Sky Survey Large Area Survey, ULAS J222711-004547. The very red infrared photometry (MKO J-K = 2.79 +/- 0.06, WISEW1-W2 = 0.65 +/- 0.05) ...

    • Extremely red stellar objects revealed by IPHAS 

      Wright, Nick; Greimel, R.; Barlow, M.J.; Drew, J.E.; Cioni, M-R.L.; Zijlstra, A.A.; Corradi, R.L.M.; Gonzalez-Solares, E.; Groot, P.; Irwin, J.; Irwin, M.J.; Mampaso, A.; Morris, R.A.H.; Steeghs, D.; Unruh, Y.C.; Walton, N.A. (2008)
      We present photometric analysis and follow-up spectroscopy for a population of extremely red stellar objects extracted from the point-source catalogue of the INT Photometric H Survey (IPHAS) of the northern galactic plane. ...

    • An Extremely Simple Multi-Wing Chaotic System: Dynamics Analysis, Encryption Application and Hardware Implementation 

      Lin, Hairong; Wang, Chunhua; Yu, Fei; Xu, Cong; Hong , Qinghui; Yao, Wei; Sun, Yichuang (2020-12-31)
      Polynomial functions have been the main barrierrestricting the circuit realization and engineering applicationof multi-wing chaotic systems (MWCSs). To eliminate thisbottleneck, we construct a simple MWCS without ...

    • Extrinsic factors governing the spore encumbrance of an indigenous population of Pasteuria hyperparasitizing root-knot nematodes, Meloidogyne species. 

      Kamra, Anju; Pawar, Swapnil; Davies, Keith; Mohan, Sharad (2016-08-28)
      Isolates of indigenous populations of gram-positive endospore-forming bacterial hyperparasite Pasteuria spp. infecting root-knot nematodes were made from arid, semi-arid, humid and sub humid ecosystems of India. A semi-arid ...