Publications
81 results found
Warren SJ, Mortlock DJ, Leggett SK, et al., 2007, A very cool brown dwarf in UKIDSS DR1, Monthly Notices of the Royal Astronomical Society, Vol: 381, Pages: 1400-1412, ISSN: 0035-8711
We report the discovery of a very cool brown dwarf, ULAS J003402.77−005206.7 (ULAS J0034−00), identified in the UKIRT Infrared Deep Sky Survey First Data Release. We provide optical, near‐infrared, and mid‐infrared photometry of the source, and two near‐infrared spectra. Comparing the spectral energy distribution of ULAS J0034−00 to that of the T8 brown dwarf 2MASS J04151954−0935066 (2MASS J0415−09), the latest type and coolest well‐studied brown dwarf to date, with effective temperature Teff∼ 750 K, we find evidence that ULAS J0034−00 is significantly cooler. First, the measured values of the near‐infrared absorption spectral indices imply a later classification, of T8.5. Secondly, the H−[4.49] colour provides an empirical estimate of the effective temperature of 540 < Teff < 660 K (± 2σ range). Thirdly, the J‐ and H‐band peaks are somewhat narrower in ULAS J0034−00, and detailed comparison against spectral models calibrated to 2MASS J0415−09 yields an estimated temperature lower by 60 < ΔTeff < 120 K relative to 2MASS J0415−09 i.e. 630 < Teff < 690 K (± 2σ), and lower gravity or higher metallicity according to the degenerate combination −0.5 < Δ(log g− 2[m/H]) < −0.25 (± 2σ). Combining these estimates, and considering systematics, it is likely the temperature lies in the range 600 < Teff < 700 K. Measurement of the parallax will allow an additional check of the inferred low temperature. Despite the low inferred Teff we find no evidence for strong absorption by NH3 over the wavelength range 1.51–1.56 μm. Evolutionary models imply that the mass and age are in the ranges 15–36 MJup and 0.5–8 Gyr, respectively. The measured proper motion, of 0.37 ± 0.07 arcsec yr−1, combined with the photometrically estimated distance of 14&
Lawrence A, Warren SJ, Almaini O, et al., 2007, The UKIRT infrared deep sky survey (UKIDSS), MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 379, Pages: 1599-1617, ISSN: 0035-8711
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- Citations: 1888
Lodieu N, Pinfield DJ, Leggett SK, et al., 2007, Eight new T4.5-T7.5 dwarfs discovered in the UKIDSS large area survey data release 1, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 379, Pages: 1423-1430, ISSN: 0035-8711
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- Citations: 72
Casali M, Adamson A, de Oliveira CA, et al., 2007, The UKIRT wide-field camera, ASTRONOMY & ASTROPHYSICS, Vol: 467, Pages: 777-784, ISSN: 0004-6361
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- Citations: 508
Venemans BP, McMahon RG, Warren SJ, et al., 2007, The discovery of the first luminous <i>z</i> ∼ 6 quasar in the UKIDSS Large Area Survey, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 376, Pages: L76-L80, ISSN: 0035-8711
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- Citations: 56
Warren SJ, Hambly NC, Dye S, et al., 2007, The United Kingdom Infrared Telescope Infrared Deep Sky Survey first data release, Monthly Notices of the Royal Astronomical Society, Vol: 375, Pages: 213-226, ISSN: 0035-8711
The First Data Release (DR1) of the United Kingdom Infrared Telescope Infrared Deep Sky Survey (UKIDSS) took place on 2006 July 21. The UKIDSS is a set of five large near-infrared surveys, covering a complementary range of areas, depths and Galactic latitudes. The DR1 is the first large release of survey-quality data from the UKIDSS and includes 320 deg2 of multicolour data to (Vega) K= 18, complete (depending on the survey) in three to five bands from the set ZYJHK, together with 4 deg2 of deep JK data to an average depth K= 21. In addition, the release includes a similar quantity of data with incomplete filter coverage. In JHK, in regions of low extinction, the photometric uniformity of the calibration is better than 0.02 mag in each band. The accuracy of the calibration in ZY remains to be quantified, and the same is true of JHK in regions of high extinction. The median image full width at half-maximum across the data set is 0.82 arcsec. We describe changes since the Early Data Release in the implementation, pipeline and calibration, quality control, and archive procedures. We provide maps of the areas surveyed, and summarize the contents of each of the five surveys in terms of filters, areas and depths. The DR1 marks completion of 7 per cent of the UKIDSS seven-year goals.
Dye S, Warren SJ, Hambly NC, et al., 2006, The UKIRT Infrared Deep Sky Survey Early Data Release, Monthly Notices of the Royal Astronomical Society, Vol: 372, Pages: 1227-1252, ISSN: 0035-8711
This paper defines the UKIRT Infrared Deep Sky Survey (UKIDSS) Early Data Release (EDR). UKIDSS is a set of five large near-infrared surveys being undertaken with the United Kingdom Infrared Telescope Wide Field Camera (WFCAM). The programme began in 2005 May and has an expected duration of 7 yr. Each survey uses some or all of the broad-band filter complement ZY JHK. The EDR is the first public release of data to the European Southern Observatory (ESO) community. All worldwide releases occur after a delay of 18 months from the ESO release. The EDR provides a small sample data set, ∼50 deg2 (about 1 per cent of the whole of UKIDSS), that is a lower limit to the expected quality of future survey data releases. In addition, an EDR+ data set contains all EDR data plus extra data of similar quality, but for areas not observed in all of the required filters (amounting to ∼220 deg2). The first large data release, DR1, will occur in mid-2006. We provide details of the observational implementation, the data reduction, the astrometric and photometric calibration and the quality control procedures. We summarize the data coverage and quality (seeing, ellipticity, photometricity, depth) for each survey and give a brief guide to accessing the images and catalogues from the WFCAM Science Archive.
Willis JP, Hewett PC, Warren SJ, et al., 2006, The OLS-lens survey: the discovery of five new galaxy-galaxy strong lenses from the SDSS, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 369, Pages: 1521-1528, ISSN: 0035-8711
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- Citations: 30
Hewett PC, Warren SJ, Leggett SK, et al., 2006, The UKIRT Infrared Deep Sky Survey <i>ZY JHK</i> photometric system:: passbands and synthetic colours, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 367, Pages: 454-468, ISSN: 0035-8711
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- Citations: 571
Willis JP, Hewett PC, Warren SJ, 2005, The discovery of two new galaxy-galaxy lenses from the Sloan Digital Sky Survey, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 363, Pages: 1369-1375, ISSN: 0035-8711
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- Citations: 22
Weatherley SJ, Warren SJ, 2005, Dynamical virial masses of Lyman-break galaxy haloes at <i>z</i>=3, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 363, Pages: L6-L10, ISSN: 0035-8711
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- Citations: 3
Clewley L, Warren SJ, Hewett PC, et al., 2005, Distant field blue horizontal branch stars -: III.: Identification of a probable outer halo stream at Galactocentric distance <i>r</i>=70 kpc, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 362, Pages: 349-360, ISSN: 0035-8711
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- Citations: 22
Wayth RB, Warren SJ, Lewis GF, et al., 2005, The lens and source of the optical Einstein ring gravitational lens ER 0047-2808, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 360, Pages: 1333-1344, ISSN: 0035-8711
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- Citations: 28
Weatherley SJ, Warren SJ, Moller P, et al., 2005, The first detection of [O III] emission from high-redshift damped Lyman-α galaxies, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 358, Pages: 985-997, ISSN: 0035-8711
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- Citations: 54
Dye S, Warren SJ, 2005, Decomposition of the visible and dark matter in the Einstein ring 0047-2808 by semilinear inversion, ASTROPHYSICAL JOURNAL, Vol: 623, Pages: 31-41, ISSN: 0004-637X
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- Citations: 79
Weatherley SJ, Warren SJ, Babbedge TSR, 2004, Reanalysis of the spectrum of the <i>z</i>=10 galaxy, ASTRONOMY & ASTROPHYSICS, Vol: 428, Pages: L29-L32, ISSN: 0004-6361
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- Citations: 13
Clewley L, Warren SJ, Hewett PC, et al., 2004, Distant field blue horizontal branch stars and the mass of the Galaxy -: II.: Photometry and spectroscopy of UKST candidates 16 < <i>B</i> < 19.5, 11 < <i>R</i> < 52 kpc, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 352, Pages: 285-298, ISSN: 0035-8711
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- Citations: 27
Hewett PC, Irwin MJ, Skillman ED, et al., 2003, Serendipity and the Sloan Digital Sky Survey: Discovery of the largest known planetary nebula on the sky, ASTROPHYSICAL JOURNAL, Vol: 599, Pages: 37-40, ISSN: 0004-637X
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- Citations: 16
Weatherley SJ, Warren SJ, 2003, Lyman-break galaxies: high mass or low?, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 345, Pages: L29-L34, ISSN: 0035-8711
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- Citations: 10
Warren SJ, Dye S, 2003, Semilinear gravitational lens inversion, ASTROPHYSICAL JOURNAL, Vol: 590, Pages: 673-682, ISSN: 0004-637X
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- Citations: 168
Weatherley SJ, Warren SJ, Croom SM, et al., 2003, Ghosts of the Milky Way: a search for topology in new quasar catalogues, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 342, Pages: L9-L13, ISSN: 0035-8711
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- Citations: 8
Willis JP, Hewett PC, Warren SJ, et al., 2002, Luminous early-type field galaxies at <i>z</i>∼0.4 -: II.: Star formation history and space density, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 337, Pages: 953-966, ISSN: 0035-8711
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- Citations: 12
Clewley L, Warren SJ, Hewett PC, et al., 2002, Distant field blue horizontal branch stars and the mass of the Galaxy - I. Classification of halo A-type stars, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 337, Pages: 87-97, ISSN: 0035-8711
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- Citations: 50
Moller P, Warren SJ, Fall SM, et al., 2002, Are high-redshift damped Lyα galaxies Lyman break galaxies?, ASTROPHYSICAL JOURNAL, Vol: 574, Pages: 51-58, ISSN: 0004-637X
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- Citations: 134
Croom SM, Warren SJ, Glazebrook K, 2001, A small-area faint KX redshift survey for QSOs in the ESO Imaging Survey <i>Chandra</i> Deep Field South, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 328, Pages: 150-158, ISSN: 0035-8711
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- Citations: 62
Warren SJ, Moller P, Fall SM, et al., 2001, NICMOS imaging search for high-redshift damped Lyα galaxies, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 326, Pages: 759-773, ISSN: 0035-8711
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- Citations: 69
Willis JP, Hewett PC, Warren SJ, 2001, Luminous early-type field galaxies at <i>z</i> ∼ 0.4 -: I.: Observations and redshift catalogue of 581 galaxies, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 325, Pages: 1002-1016, ISSN: 0035-8711
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- Citations: 8
Warren SJ, Hewett PC, Foltz CB, 2000, The KX method for producing <i>K</i>-band flux-limited samples of quasars, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 312, Pages: 827-832, ISSN: 0035-8711
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- Citations: 79
Bunker AJ, Warren SJ, Clements DL, et al., 1999, Limits on the star formation rates of <i>z</i>>2 damped Lyα systems from Hα spectroscopy, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 309, Pages: 875-884, ISSN: 0035-8711
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- Citations: 56
Fynbo JU, Moller P, Warren SJ, 1999, Extended Lyα emission from a damped Lyα absorber at <i>z</i>=1.93, and the relation between damped Lyα absorbers and Lyman-break galaxies, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 305, Pages: 849-858, ISSN: 0035-8711
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- Citations: 160
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