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16 papers · 1 filter
X-ray emission and internal kinematics in early-type galaxies. I. Observations
S. Pellegrini, E. V. Held, L. Ciotti
Long slit spectroscopic data for 7 early-type galaxies with X-ray emission have been analyzed to derive velocity dispersion and radial velocity profiles. Major axis rotation curves…
Dynamical Models Of S0 And Sa Galaxies
Ezio Pignatelli, Giuseppe Galletta
We present a set of detailed, self-consistent, isotropic dynamical models for disc galaxies. We start from the hypothesis that each galaxy can be decomposed in a bulge, following t…
The Chemical Evolution of the Galaxy: the two-infall model
C. Chiappini, F. Matteucci, R. Gratton
In this paper we present a new chemical evolution model for the Galaxy which assumes two main infall episodes for the formation of halo-thick disk and thin disk, respectively. We d…
On the Difference Between Radio Quiet and Radio Loud AGN
P. Marziani, M. Calvani, J. W. Sulentic
A systematic difference in alignment between the central black hole spin and the angular momentum of the accreting gas may help explain several differences found in the optical and…
UBVRI CCD photometry of the old open cluster NGC 6253
A. Bragaglia, G. Tessicini, M. Tosi +2
We present UBVRI photometry for the old open cluster NGC 6253. From comparison of the observed colour-magnitude diagrams with simulations based on stellar evolutionary models we de…
Abundances for Globular Cluster Giants: I. Homogeneous Metallicities for 24 Clusters
E. Carretta, R. G. Gratton
We have obtained high-res, high S/N ratio CCD echelle spectra of 10 bright red giants in 3 GCs (47Tuc, NGC6752 and NGC6397) roughly spanning the range of metallicities of the galac…