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Discs in early-type lensing galaxies: effects on magnification ratios and measurements of
Ole Moeller, Paul Hewett, A. W. Blain
Observations of early-type galaxies, both in the local universe and in clusters at medium redshifts, suggest that these galaxies often contain discs or disc-like structures. Using…
Luminous early-type field galaxies at z ~ 0.4 - II. Star-formation history and space density
J. P. Willis, P. C. Hewett, S. J. Warren +1
We present a combined photometric and spectroscopic analysis of the star formation history and space density of a sample of 485 luminous, M_V - 5 log h < -20.5, field early-type ga…
Distant field BHB stars and the mass of the Galaxy I: Classification of halo A-type stars
L. Clewley, S. J. Warren, P. C. Hewett +3
This is the first in a series of three papers presenting a new calculation of the mass of the Galaxy based on radial velocities and distances measured for a sample of some 100 fain…
The Point-Agape survey: 4 high signal-to-noise ratio microlensing candidates detected towards M31
S. Paulin-Henriksson, P. Baillon, A. Bouquet +12
We have carried out a survey of the Andromeda galaxy for unresolved microlensing (pixel lensing). We present a subset of four short timescale, high signal-to-noise microlensing can…
Detection of He II reionization in the SDSS quasar sample
T. Theuns, M. Bernardi, J. Frieman +4
The expansion of the Universe leads to a rapid drop in the mean hydrogen Ly-alpha opacity tau of the intergalactic medium (IGM), tau (1+z)^{3.8}, between redshifts 4 and 3. Measure…
A Candidate M31/M32 Intergalactic Microlensing Event
S. Paulin-Henriksson, P. Baillon, A. Bouquet +13
We report the discovery of a microlensing candidate projected 2'54" from the center of M32, on the side closest to M31. The blue color (R-I= 0.00 +/- 0.14) of the source argues str…