Browsing University of Hertfordshire by Author "Chiu, K."

Now showing items 1-5 of 5

    • Constraints on star-forming galaxies at z≥ 6.5 from HAWK-I Y-band imaging of GOODS-South 

      Hickey, S.; Bunker, A.; Jarvis, M.J.; Chiu, K.; Bonfield, D. (2010)
      We present the results of our search for high-redshift Lyman-break galaxies over the GOODS-South field. We use Hubble Space Telescope (HST)-ACS data in B, V, i' & z', Very Large Telescope (VLT)-ISAAC J and Ks, Spitzer–Infrared ...

    • The contribution of high-redshift galaxies to cosmic reionization : new results from deep WFC3 imaging of the Hubble Ultra Deep Field 

      Bunker, A.; Wilkins, S.; Ellis, R.S.; Stark, D.; Lorenzoni, S.; Chiu, K.; Lacy, M.; Jarvis, M.J.; Hickey, S. (2010)
      We have searched for star-forming galaxies at z≈ 7–10 by applying the Lyman-break technique to newly released Y-, J- and H-band images (1.1, 1.25 and 1.6 μm) from Wide Field Camera 3 (WFC3) on the Hubble Space Telescope. ...

    • Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey 

      Pinfield, D.J.; Burningham, B.; Tamura, M.; Leggett, S.K.; Lodieu, N.; Lucas, P.W.; Mortlock, D.J.; Warren, S.J.; Homeier, D.; Ishi, M.; Deacon, Niall; McMahon, R.G.; Hewett, P.C.; Zapatero Osorio, M.R.; Martin, E.L.; Jones, H.R.A.; Venemans, B.P.; Day-Jones, A.C.; Dobbie, P.D.; Folkes, S.; Dye, S.; Allard, F.; Baraffe, I.; Barrado y Navascues, D.; Casewell, S.L.; Chiu, K.; Chabrier, G.; Clarke, F.; Hodgkin, S.T.; Magazzu, A.; McCaughrean, M.J.; Moraux, E.; Nakajima, T.; Pavlenko, Y.; Tinney, C.G. (2008)
      We present the discovery of fifteen new T2.5-T7.5 dwarfs (with estimated distances between 24–93pc), identified in the first three main data releases of the UKIRT Infrared Deep Sky Survey. This brings the total number of ...

    • Probing ∼L* Lyman-break galaxies at z≈ 7 in GOODS-South with WFC3 on Hubble Space Telescope 

      Wilkins, S.; Bunker, A.; Ellis, R.S.; Stark, D.; Stanway, E.R.; Chiu, K.; Lorenzoni, S.; Jarvis, M.J. (2010)
      We analyse recently acquired near-infrared Hubble Space Telescope imaging of the Great Observatories Origins Deep Survey (GOODS)-South field to search for star-forming galaxies at z≈ 7.0 . By comparing Wide Field Camera 3 ...

    • A very cool brown dwarf in UKIDSS DR1 

      Warren, S.J.; Mortlock, D.J.; Leggett, S.K.; Pinfield, D.J.; Homeier, D.; Dye, S.; Jameson, R.F.; Lodieu, N.; Lucas, P.W.; Adamson, A.J.; Allard, F.; Barrado y Navascues, D.; Casali, M.; Chiu, K.; Hambly, N.C.; Hewett, P.C.; Hirst, P.; Irwin, M.J.; Lawrence, A.; Liu, M.C.; Martin, E.L.; Smart, R.L.; Valdivielso, L.; Venemans, B.P. (2007)