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9 papers · 2 filters
Simulating Wide-Field Quasar Surveys from the Optical to Near-Infrared
Natasha Maddox, Paul C. Hewett
A number of deep, wide-field, near-infrared surveys employing new infrared cameras on 4m-class telescopes are about to commence. These surveys have the potential to determine the f…
Selecting damped Lyman-alpha systems through CaII absorption. I: Dust depletions and reddening at z~1
Vivienne Wild, Paul Hewett, Max Pettini
We use the average E(B-V) and ZnII column densities of a sample of z~1 CaII (3935, 3970) absorption line systems selected from the Sloan Digital Sky Survey (SDSS DR4) to show that…
Classical novae from the POINT-AGAPE microlensing survey of M31 -- II. Rate and statistical characteristics of the nova population
M. J. Darnley, M. F. Bode, E. Kerins +17
We report the results of our statistical study of the POINT-AGAPE CNe catalogue. The first Sloan and analysis of the MMRD relationship in M31 is performed using the resul…
The discovery of two new galaxy-galaxy lenses from the SDSS
J. P. Willis, P. C. Hewett, S. J. Warren
The gravitational lens configuration where a background galaxy is closely aligned with a foreground galaxy, can provide accurate measurement of the dark matter density profile in t…
Distant Field BHB Stars III: Identification of a probable outer halo stream at Galactocentric distance r = 70 kpc
L. Clewley, S. J. Warren, P. C. Hewett +3
We present VLT-FORS1 spectra of a sample of 34 faint 20.0 < g* < 21.1 A-type stars selected from the Sloan Digital Sky Survey Early Data Release, with the goal of measuring the vel…
Evidence for dust reddening in DLAs identified through CaII H&K absorption
Vivienne Wild, Paul C. Hewett
We present a new sample of 31 CaII(H&K) 3935,3970 absorption line systems with 0.84<z_abs<1.3 discovered in the spectra of Sloan Digital Sky Survey (SDSS) Data Release 3 quasars, t…
Automated Detection of Classical Novae with Neural Networks
S. Feeney, V. Belokurov, N. W. Evans +9
The POINT-AGAPE collaboration surveyed M31 with the primary goal of optical detection of microlensing events, yet its data catalogue is also a prime source of lightcurves of variab…
POINT-AGAPE Pixel Lensing Survey of M31 : Evidence for a MACHO contribution to Galactic Halos
S. Calchi Novati, S. Paulin-Henriksson, J. An +15
The POINT-AGAPE collaboration is carrying out a search for gravitational microlensing toward M31 to reveal galactic dark matter in the form of MACHOs (Massive Astrophysical Compact…
Peering through the OH-forest: a new technique to remove residual sky features from SDSS spectra
Vivienne Wild, Paul C. Hewett
The Sloan Digital Sky Survey (SDSS) currently provides by far the largest homogeneous sample of intermediate signal-to-noise ratio (S/N) optical spectra of galaxies and quasars. Th…