4 papers · 1 filter
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…
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…