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84 papers · 1 filter
An ESO/VLT survey of NIR (Z<=25) selected galaxies at redshifts 4.5<z<6: constraining the cosmic star formation rate near the reionization epoch
A. Fontana, F. Poli, N. Menci +4
We present the results of a VLT and HST imaging survey aimed at the identification of 4.5<z<6 galaxies. In the VLT data, a set of broad and intermediate band filters has been used…
A BeppoSAX Observation of the IC1262 Galaxy Cluster
D. S. Hudson, M. J. Henriksen, S. Colafrancesco
We present an analysis of BeppoSAX observations of the IC1262 galaxy cluster and report the first temperature and abundance measurements, along with preliminary indications of diff…
A comparative study of the X-ray afterglow properties of optically bright and dark GRBs
M. De Pasquale, L. Piro, R. Perna +9
We have examined the complete set of X-ray afterglow observations of dark and optically bright GRBs performed by BeppoSAX until February 2001. X-ray afterglows are detected in 90%…
Variable stars in Stellar Systems
Giuseppe Bono, Silvia Petroni, Marcella Marconi
We discuss in detail the pulsation properties of variable stars in globular clusters (GCs) and in Local Group (LG) dwarf galaxies. Data available in the literature strongly support…
HST observations of the metal rich globular clusters NGC6496 and NGC6352
L. Pulone, G. De Marchi, S. Covino +1
Deep exposures of the metal-rich globular clusters NGC6496 and NGC6352 were obtained with the WFPC2 camera on board the HST through the F606W and F814W filters. The resulting colou…
The Non-Thermal Sunyaev-Zel'dovich Effect in Clusters of Galaxies
S. Colafrancesco, P. Marchegiani, E. Palladino
In this paper we provide a general derivation of the non-thermal (as well as of the thermal) SZ effect in galaxy clusters which is exact in the Thomson limit to any approximation o…