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Solar system tests of the cosmological constant
Philippe Jetzer, Mauro Sereno
We discuss the influence of the cosmological constant on the gravitational equations of motion of bodies with arbitrary masses and eventually solve the two-body problem. Observ…
Microlensing constraints on the Galactic Bulge Initial Mass Function
S. Calchi Novati, F. De Luca, Ph. Jetzer +2
Aims. We seek to probe the Galactic bulge IMF starting from microlensing observations. Methods. We analyse the recent results of the microlensing campaigns carried out towards the…
Substructures in lens galaxies: PG1115+080 and B1555+375, two fold configurations
Marco Miranda, Philippe Jetzer
We study the anomalous flux ratio which is observed in some four-image lens systems, where the source lies close to a fold caustic. In this case two of the images are close to the…
Q0045-3337: models including strong lensing by a spiral galaxy
M. Chieregato, M. Miranda, P. Jetzer
Aims. Falomo et al. (2005) discovered a disk-like galaxy at ~ 1.2 arcsec from the QSO Q0045-3337 by means of ESO VLT adaptive optics. They estimated a galaxy Einstein radius (for a…
Probing MACHOs by observation of M31 pixel lensing with the 1.5m Loiano telescope
S. Calchi Novati, G. Covone, F. De Paolis +9
We analyse a series of pilot observations in order to study microlensing of (unresolved) stars in M31 with the 1.5m Loiano telescope, including observations on both identified vari…
Evolution of gravitational orbits in the expanding universe
M. Sereno, Ph. Jetzer
The gravitational action of the smooth energy-matter components filling in the universe can affect the orbit of a planetary system. Changes are related to the acceleration of the c…