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91 papers · 1 filter
The 1998 outburst of the X-ray transient XTE J2012+381 as observed with BeppoSAX
S. Campana, L. Stella, T. Belloni +5
We report on the results of a series of X-ray observations of the transient black hole candidate XTE J2012+381 during the 1998 outburst performed with the BeppoSAX satellite. The o…
The X-ray Source at the Center of the Cassiopeia A Supernova Remnant
S. Mereghetti, A. Tiengo, G. L. Israel
We present the first results of an XMM-Newton observation of the central X-ray source in the Cas A supernova remnant. The spectrum can be fit equally well with an absorbed steep po…
Baryon bias and structure formation in an accelerating universe
Luca Amendola, Domenico Tocchini-Valentini
In most models of dark energy the structure formation stops when the accelerated expansion begins. In contrast, we show that the coupling of dark energy to dark matter may induce t…
On the primordial helium content: CMB and stellar constraints
G. Bono, A. Balbi, S. Cassisi +2
We present the results of a joint investigation aimed at constraining the primordial He content () on the basis of both the Cosmic Microwave Background (CMB) anisotropy and tw…
The BeppoSAX High Energy Large Area Survey -V. The nature of the hard X-ray source populations and its evolution
F. La Franca, F. Fiore, C. Vignali +7
We present optical spectroscopic identifications of hard X-ray (5-10 keV) selected sources belonging to the HELLAS sample obtained with BeppoSAX down to a 5-10 keV flux limit of f_…
The K20 survey. I. Disentangling old and dusty star-forming galaxies in the ERO population
A. Cimatti, E. Daddi, M. Mignoli +12
We present the results of VLT optical spectroscopy of a complete sample of 78 EROs with R-Ks\geq5 over a field of 52 arcmin^2. About 70% of the 45 EROs with Ks\leq19.2 have been sp…