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12 papers · 2 filters
An Optical Time-Delay for the Lensed BAL Quasar HE2149-2745
I. Burud, F. Courbin, P. Magain +11
We present optical V and i-band light curves of the gravitationally lensed BAL quasar HE2149-2745. The data, obtained with the 1.5m Danish Telescope (ESO-La Silla) between October…
A novel approach for extracting time-delays from lightcurves of lensed quasar images
I. Burud, P. Magain, S. Sohy +1
We present a new method to estimate time delays from light curves of lensed quasars. The method is based on chi^2 minimization between the data and a numerical model light curve. A…
The polarization properties of Broad Absorption Line QSOs: observational results
D. Hutsemekers, H. Lamy
Correlations between BAL QSO intrinsic properties and polarization have been searched for. Some results are summarized here, providing possible constraints on BAL outflow models.
In.XS: project for a future spaceborne hard X-ray all-sky survey
P. B. Marty, J. Schultz, C. Bayer +13
The latest all-sky survey in hard X-ray band was performed by the HEAO-1 satellite (13-80 keV) with an angular resolution of 24x48 arcmin. A diffuse hard X-Ray background (HXB) was…
The Self-Enrichment of Galactic Halo Globular Clusters: the mass-metallicity relation
G. Parmentier, G. Gilmore
We discuss the existence of a mass-metallicity relation among galactic halo globular clusters. The lack of any luminosity-metallicity correlation in globular cluster systems has be…
Weighing nearby stars with GAIA ?
S. Dib, J. Surdej, J. -F. Claeskens
Microlensing consists in two major effects: (1) variation in the apparent position of the background sources (astrometric component) and (2) flux variations of the background sourc…