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New Clues on the Nature of Extremely Red Galaxies
A. Cimatti, E. Daddi, S. di Serego Alighieri +7
We present near-infrared VLT-UT1+ISAAC spectroscopy of a sample of 9 extremely red galaxies (ERGs) with R-K>5 and K<19.0. Neither strong emission lines (F_lim<1-5 10^{-16} erg s^{-…
The Star Formation History of Ellipticals from the Fossil Evidence
A. Renzini, A. Cimatti
The current evidence about the age of stellar populations in elliptical galaxies is reviewed. The case for the bulk of stars in galactic spheroids (ellipticals and bulges) having f…
GRB 990510: linearly polarized radiation from a fireball
S. Covino, D. Lazzati, G. Ghisellini +12
Models for gamma-ray burst afterglows envisage an hyper-relativistic fireball that is decelerated in the ambient medium around the explosion site. This interaction produces a shock…
An Atlas of Monte Carlo Models of Dust Extinction in Galaxies for Cosmological Applications
A. Ferrara, S. Bianchi, A. Cimatti +1
We present an extensive study of the radiative transfer in dusty galaxies based on Monte Carlo simulations. The main output of these simulations are the attenuation curves ${\cal A…
BeppoSAX Observations of the Radio Galaxy Centaurus A
P. Grandi, C. M. Urry, L. Maraschi
We present preliminary results from two observations of the radio galaxy Centaurus A performed by the BeppoSAX satellite. We did not detect any spectral variation of the nuclear co…
BeppoSAX Observations of 2 Jy Lobe-dominated Broad-Line Sources. I. The Discovery of a Hard X-ray Component
Paolo Padovani, Raffaella Morganti, Joachim Siebert +2
We present new BeppoSAX LECS, MECS and PDS observations of five lobe-dominated, broad-line active galactic nuclei selected from the 2-Jy sample of southern radio sources. These inc…
The NV/CIV ratio in high redshift radio galaxies
R. A. E. Fosbury, J. Vernet, M. Villar-Martin +3
Deep Keck spectropolarimetry has been obtained of a sample of powerful radio galaxies with . In addition to a clear 2200Ådust scattering/extinction signature and…