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Time-Dependent Photoionization in a Dusty Medium II: Evolution of Dust Distributions and Optical Opacities
Rosalba Perna, Davide Lazzati, Fabrizio Fiore
The interaction of a radiation field with a dusty medium is a relevant issue in several astrophysical contexts. We use the time-dependent photoionization code in a dusty medium dev…
The Far Ultraviolet Spectroscopic picture of the Missing Baryons in the Local Group
F. Nicastro, A. Zezas, M. Elvis +6
The number of detected baryons in the low-redshift Universe (z < 1) is far small er than the corresponding number of baryons observed at higher redshift. According to hydrodynamica…
Heavy Element Abundances and Dust Depletions in the Host Galaxies of Three Gamma-Ray Bursts
S. Savaglio, S. M. Fall, F. Fiore
We have derived the column densities of heavy elements in three gamma-ray burst (GRB) optical transients, associated with the circumburst or interstellar medium (ISM) of the host g…
A BeppoSAX Observation of KS 1731-260 in its Quiescent State: Constraints on the NS Magnetic Field
L. Burderi, T. Di Salvo, L. Stella +10
We report here the results of a 90 ks BeppoSAX observation of the low mass X-ray binary and atoll source KS 1731-260 during a quiescent phase. From this observation we derive a sou…
Spectral properties of faint hard X-ray selected sources
E. Piconcelli, L. Bassani, M. Cappi +3
We present preliminary results from a XMM-Newton spectroscopic survey of hard (2 -10 keV) X-ray sources detected serendipitously in seven EPIC FOVs. All observations were performed…
Chandra Discovery of a Tree in the X-ray Forest towards PKS 2155-304: the Local Filament?
F. Nicastro, A. Zezas, J. Drake +6
We present the first X-ray detection of resonant absorption from warm/hot local gas either in our Galaxy, or in the Intergalactic space surrounding our Galaxy, along the line of si…