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The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS
S. T. Hodgkin, M. J. Irwin, P. C. Hewett +1
In this paper we describe the photometric calibration of data taken with the near-infrared Wide Field Camera (WFCAM) on the United Kingdom Infrared Telescope (UKIRT). The broadband…
Finding SDSS BALQSOs Using Non-Negative Matrix Factorisation
James T. Allen, Paul C. Hewett, Vasily Belokurov +1
Modern spectroscopic databases provide a wealth of information about the physical processes and environments associated with astrophysical populations. Techniques such as blind sou…
The UKIRT Infrared Deep Sky Survey and the search for the most distant quasars
Daniel J. Mortlock, Mitesh Patel, Stephen J. Warren +5
The UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) has the necessary combination of filters (Y, J, H and K), depth (Y <~ 20.2) and area coverage (~4000 deg^2) to d…
Dust depletion, chemical uniformity and environment of CaII H&K quasar absorbers
Berkeley J. Zych, Michael T. Murphy, Paul C. Hewett +1
CaII 3934,3969 absorbers, which are likely to be a subset of damped Lyman alpha systems, are the most dusty quasar absorbers known, with an order of magnitude more extinction in E(…
Discovery of a redshift 6.13 quasar in the UKIRT Infrared Deep Sky Survey
D. J. Mortlock, M. Patel, S. J. Warren +10
Optical and near-infrared (NIR) spectra are presented for ULAS J131911.29+095951.4 (hereafter ULAS J1319+0950), a new redshift z = 6.127 +/- 0.004 quasar discovered in the Third Da…
Measurements of CaII absorption, metals, and dust in a sample of z~1 DLAs and subDLAs
Daniel Nestor, Max Pettini, Paul Hewett +2
We present observations of CaII, ZnII, and CrII absorption lines in 16 DLAs and 6 subDLAs at 0.6 < z < 1.3, obtained for the dual purposes of: (i) clarifying the relationship betwe…
Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey
D. J. Pinfield, B. Burningham, M. Tamura +32
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…
Two New Large Separation Gravitational Lenses from SDSS
V. Belokurov, N. W. Evans, P. C. Hewett +4
We present discovery images, together with follow-up imaging and spectroscopy, of two large separation gravitational lenses found by our survey for wide arcs (the CASSOWARY). The s…
Models of the Cosmic Horseshoe Gravitational Lens
Simon Dye, N. W. Evans, V. Belokurov +2
We model the extremely massive and luminous lens galaxy in the Cosmic Horseshoe Einstein ring system, recently discovered in the Sloan Digital Sky Survey. We use the semi-linear me…
Luminous K-band Selected Quasars from UKIDSS
Natasha Maddox, Paul C. Hewett, S. J. Warren +1
The largest K-band flux-limited sample of luminous quasars to date has been constructed from the UKIDSS Large Area Survey Early Data Release, covering an effective area of 12.8 deg…