A reformulation of the Barrabes-Israel null-shell formalism
We consider a situation in which two metrics are joined at a null hypersurface. It often occurs that the union
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A BeppoSAX observation of the X-ray pulsar 1E 2259+586 and the supernova remnant G109.1-1.0 (CTB 109)
The 7 s X-ray pulsar 1E2259+586 and the supernova remnant (SNR) G109.1-1.0 (CTB 109) were observed by BeppoSAX in 1996
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A BeppoSAX study of the pulsating transient X0115+63: the first X-ray spectrum with four cyclotron harmonic features
The recurrent hard pulsating X-ray transient §was observed with \B on March 19, when the source was at a 2--10
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A low-mass HI companion of NGC 1569?
High-sensitivity maps of the large-scale structure of atomic hydrogen in the starburst dwarf galaxy NGC 1569 show evidence for an
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A Model of the Universe including dark Energy
In this work we explore a model of the universe in which dark energy is modelled explicitely with both a
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A new class of X-ray Pulsars ?
While the distribution of spin periods of High Mass X-ray Binaries (HMXBs) spans more than four orders of magnitude (69ms
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Axion-dilaton-modulus gravity theory of Brans-Dicke-type and conformal symmetry
Conformal symmetry is investigated within the context of axion-dilaton-modulus theory of gravity of Brans-Dicke-type. A distinction is made between general
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BeppoSAX monitoring of the ``anomalous'' X-ray pulsar 4U 0142+61
The 8.7s X-ray pulsar 4U 0142+61 was monitored by BeppoSAX between January 1997 and February 1998. This source belongs to
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BeppoSAX observations of a new X-ray burster in the Galactic Center region, possibly coincident with a recurrent transient
We report BeppoSAX NFI observations of the X-ray source SAX~J1747.0--2853 recently discovered in the region of the Galactic Center. The
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BMW: a ROSAT-HRI source catalogue obtained with a wavelet transform detection algorithm
In collaboration with the Observatories of Palermo and Rome and the SAX-SDC we are constructing a multi-site interactive archive system
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Broad Band X-ray Spectra of M31 Sources with BeppoSAX
We present the first spectral study of the X-ray emitting stellar sources in M31 in the energy band from 0.1
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Comments on the paper astro-ph/0103335 by C Rubano and P Scudellaro
We briefly comment on a paper by Rubano and Scudellaro [astro-ph/0103335] where they found general exact solutions for two classes
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Conformal classes of Brans-Dicke gravity
A classification of Brans-Dicke theories of gravitation, based on the behaviour of the dimensionless gravitational coupling constant, is given. It
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Continuum Power Spectrum Components in X-Ray Sources: Detailed Modelling and Search for Coherent Periodicities
This paper summarises two recently developed techniques in power spectral analysis and their application to a sample of X-ray light
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Detection of Neutral Carbon in the M 31 Dark Cloud D478
Emission from the 492 GHz CI tranition was detected towards the dark cloud D478 in M31. Using existing 12CO and
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Discovery of a faint 437 s X-ray pulsar 1SAX J1452.8-5949
A new pulsar, 1SAX J1452.8-5949, was discovered during a BeppoSAX galactic plane survey on 1999 July 20 at R.A.=14h 52m
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Discovery of X-rays from the composite supernova remnant G0.9+0.1 with the BeppoSAX satellite
Using the BeppoSAX satellite we have obtained the first secure X-ray detection of the supernova remnant G0.9+0.1. The 1-10 keV
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Distributed Algorithms in Multihop Broadcast Networks
Broadcast networks are often used in modern communication systems. A common broadcast network is a single hop shared media system,
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ESO deep observations of the optical afterglow of GRB990510
We present the results of optical observations of the GRB990510 field carried out at different epochs from European Southern Observatory
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Evidence for an ~80 day periodicity in the X-ray transient pulsar XTE J1946+274
We report evidence for an ~ 80 d periodicity in the X-ray flux of the hard transient pulsar XTE J1946+274.
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Extragalactic H2 and its variable relation to CO
A steep metallicity dependence of the CO-to-H2 conversion factor X of the form log X = 12.2 - 2.5 log[O]/[H],
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Five-dimensional scenario with a fluctuating three-brane: an stochastic approach to gravity
A five-dimensional scenario with a non compact extra dimension of infinite extent is studied, in which a single three-brane is
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GRB 990510: linearly polarized radiation from a fireball
Models for gamma-ray burst afterglows envisage an hyper-relativistic fireball that is decelerated in the ambient medium around the explosion site.
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Modelling dark energy with quintessence and a cosmological constant
In this talk we present a model of the universe in which dark energy is modelled explicitely with both a
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