Search Publications
The SAURON project - II. Sample and early results
Emsellem, Eric; Miller, Bryan W.; Carollo, C. M. +9 more
Early results are reported from the SAURON survey of the kinematics and stellar populations of a representative sample of nearby E, S0 and Sa galaxies. The survey is aimed at determining the intrinsic shape of the galaxies, their orbital structure, the mass-to-light ratio as a function of radius, the age and metallicity of the stellar populations,…
Numerical methods of star formation history measurement and applications to seven dwarf spheroidals
Dolphin, A. E.
A comprehensive study of the measurement of star formation histories from colour-magnitude diagrams (CMDs) is presented, with an emphasis on a variety of subtle issues involved in the generation of model CMDs and maximum likelihood solution. Among these are the need for a complete sampling of the synthetic CMD, the use of proper statistics for dea…
Efficient multi-Gaussian expansion of galaxies
Cappellari, Michele
We describe a simple, efficient, robust and fully automatic algorithm for the determination of a multi-Gaussian expansion (MGE) fit to galaxy images, to be used as a parametrization for the galaxy stellar surface brightness. In most cases the least-squares solution found by this method essentially corresponds to the minimax, constant relative erro…
Measuring the black hole masses of high-redshift quasars
McLure, R. J.; Jarvis, M. J.
A new technique is presented for determining the black hole masses of high-redshift quasars from optical spectroscopy. The new method utilizes the full-width at half-maximum (FWHM) of the low-ionization MgII emission line and the correlation between the broad-line region (BLR) radius and the continuum luminosity at 3000 Å. Using archival ultraviol…
The nature of faint submillimetre-selected galaxies
Kneib, J. -P.; Ivison, R. J.; Smail, Ian +1 more
We present the source catalogue for the SCUBA Lens Survey. We summarize the results of extensive multiwavelength observations of the 15 submillimetre-selected galaxies in the catalogue, from X-rays to radio. We discuss the main observational characteristics of faint submillimetre galaxies as a population, and consider their interpretation within t…
Deep radio imaging of the SCUBA 8-mJy survey fields: submillimetre source identifications and redshift distribution
Ivison, R. J.; Smail, Ian; Dunlop, J. S. +12 more
The SCUBA 8-mJy survey is the largest submillimetre (submm) extragalactic mapping survey undertaken to date, covering 260 arcmin2 to a 4 σ detection limit of ~=8 mJy at 850 µm, centred on the Lockman Hole and ELAIS N2 regions. Here, we present the results of new 1.4-GHz imaging of these fields, of the depth and resolution necessar…
A long hard look at MCG-6-30-15 with XMM-Newton
Young, A. J.; Nandra, K.; Iwasawa, K. +6 more
We present the first results from a 325-ks observation of the Seyfert 1 galaxy MCG-6-30-15 with XMM-Newton and BeppoSAX. The strong, broad, skewed iron line is clearly detected and is well characterized by a steep emissivity profile within 6rg (i.e. 6GM/c2) and a flatter profile beyond. The inner radius of the emission appear…
The magnetic field and wind confinement of θ1 Orionis C
Donati, J. -F.; Babel, J.; Harries, T. J. +3 more
We report the detection, through spectropolarimetric observations, of a strong dipolar magnetic field of presumably fossil origin at the surface of the very young O star θ1 Ori C. The Stokes V signatures we detect are variable with time, the variations being consistent with rotational modulation. A detailed modelling of our observations…
Measuring the redshift evolution of clustering: the Hubble Deep Field South
Colombi, S.; Matarrese, S.; Fontana, A. +6 more
We present an analysis of the evolution of galaxy clustering in the redshift interval 0<=z<=4.5 in the Hubble Deep Field South (HDF-South). The HST optical data are combined with infrared ISAAC/VLT observations, and photometric redshifts are used for all the galaxies brighter than IAB<=27.5. The clustering signal is obtained in…
New periodic variables from the Hipparcos epoch photometry
Koen, Chris; Eyer, Laurent
Two selection statistics are used to extract new candidate periodic variables from the epoch photometry of the Hipparcos catalogue. The primary selection criterion is a signal-to-noise ratio. The dependence of this statistic on the number of observations is calibrated using about 30000 randomly permuted Hipparcos data sets. A significance level of…