10.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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33 papers · 2 filters
The ROSAT Deep Cluster Survey: Constraints on Cosmology
S. Borgani, P. Rosati, R. Della Ceca +2
We use the ROSAT Deep Cluster Survey (RDCS) to trace the evolution of the cluster abundance out to and constrain cosmological models. We resort to a phenomenological…
The RASSCALS: An X-ray and Optical Study of 260 Galaxy Groups
A. Mahdavi, H. Boehringer, M. J. Geller +1
We describe the ROSAT All-Sky Survey-Center for Astrophysics Loose Systems (RASSCALS), the largest X-ray and optical survey of low mass galaxy groups to date. We draw 260 groups fr…
The redshift-space two-point correlation function of galaxy groups in the CfA2 and SSRS2 surveys
M. Girardi, W. Boschin, L. da Costa +1
We measure the two-point redshift-space correlation function of loose groups of galaxies, xi_GG, for the combined CfA2 and SSRS2 surveys. Our combined group catalog constitutes the…
The low luminosity AGN in the LINER galaxy M81: BeppoSAX discovery of highly ionized gas
S. Pellegrini, M. Cappi, L. Bassani +3
The LINER nucleus of the nearby spiral galaxy M81 was pointed by BeppoSAX, which caught it at the highest (2-10) keV flux level observed so far. The LECS, MECS and PDS data, extend…
Joint Formation of QSOs and Spheroids: QSOs as clocks of star formation in Spheroids
G. L. Granato, L. Silva, P. Monaco +4
Direct and indirect observational evidence leads to the conclusion that high redshift QSOs did shine in the core of early type proto-galaxies during their main episode of star form…
Confirming EIS Clusters. Optical and Infrared Imaging
L. F. Olsen, H. E. Jorgensen, M. Scodeggio +6
Clusters of galaxies are important targets in observationally cosmology, as they can be used both to study the evolution of the galaxies themselves and to constrain cosmological pa…
The ISOCAM/LW Detector Dark Current Behaviour
A. Biviano, M. Sauvage, P. Gallais +5
We describe the calibration, measurements and data reduction, of the dark current of the ISOCAM/LW detector. We point-out the existence of two significant drifts of the LW dark-cur…
BeppoSAX Observations of GRB980425: Detection of the Prompt Event and Monitoring of the Error Box
E. Pian, L. Amati, L. A. Antonelli +25
We present BeppoSAX follow-up observations of GRB980425 obtained with the Narrow Field Instruments (NFI) in April, May, and November 1998. The first NFI observation has detected wi…
The Galactic Lithium Evolution Revisited
D. Romano, F. Matteucci, P. Molaro +1
The evolution of the 7Li abundance in the Galaxy has been computed by taking into account several 7Li sources: novae, massive AGB stars, C-stars, Type II SNe and GCRs. The theoreti…
A study of the core of the Shapley Concentration: IV. Distribution of intercluster galaxies and supercluster properties
S. Bardelli, E. Zucca, G. Zamorani +2
(abridged) We present the results of a redshift survey of intercluster galaxies in the central region of the Shapley Concentration supercluster, aimed at determining the distributi…
The properties of Supernova 1997cy associated to GRB970514
M. Turatto, T. Suzuki, P. A. Mazzali +7
The extraordinary SN 1997cy associated with GRB 970514 has been observed photometrically and spectroscopically for nearly 2 yr. At the time of discovery SN 1997cy was the brightest…
The NOG Sample: Galaxy Systems and 3D Real-Space Galaxy Density
C. Marinoni, G. Giuricin, L. Ceriani +1
We discuss the 3D real-space reconstruction of the optical galaxy density field in the local Universe as derived from the galaxies of the Nearby Optical Galaxy (NOG) sample. NOG is…
Extended CIII]lambda1909 emission in Q0957+561
E. Mediavilla, V. Motta, ; S. Arribas +7
2D spectroscopy of Q0957+561 in the CIII]lambda1909 emission line reveals a rich variety of spatially extended features. We point out: (i) a blueshifted region apparently connectin…
Revised Baade-Wesselink Analysis of RR Lyrae Stars
Carla Cacciari, Gisella Clementini, Fiorella Castelli +1
We have applied the Baade-Wesselink method to two field RR Lyrae stars, i.e. SW And and RR Cet, and derived their distances and physical parameters. With respect to previous B-W an…
The NOG Sample: Selection of the Sample and Identification of Galaxy Systems
G. Giuricin, C. Marinoni, L. Ceriani +1
In order to map the galaxy density field in the local universe, we select the Nearby Optical Galaxy (NOG) sample, which is a distance-limited (cz < 6000 km/s) and magnitude--limite…
A new investigation on the Antlia Dwarf Galaxy
A. M. Piersimoni, G. Bono, M. Castellani +4
We present deep (I,V-I) and (I,B-I) color-magnitude diagrams (CMDs) of the Antlia dwarf galaxy, based on Science Verification (SV) data collected with the FORS I camera on the ESO…
Diffuse Thermal Emission from Very Hot Gas in Starburst Galaxies
M. Cappi, M. Persic, L. Bassani +7
BeppoSAX observations of the nearby archetypical starburst galaxies NGC253 and M82 are presented. Spectral analysis shows that the 2-10 keV spectra of both galaxies, extracted from…
Low deuterium abundance in the zabs=3.514 absorber towards APM 08279+5255
Paolo Molaro, Piercarlo Bonifacio, Miriam Centurion +1
A high-resolution, high signal-to-noise HIRES-Keck spectrum of APM 08279+5255 reveals a feature in the HI Ly alpha profile of the zabs=3.514 absorber at the expected position of th…
Joint Cosmological Formation of QSOs and Bulge-dominated Galaxies
Pierluigi Monaco, Paolo Salucci, Luigi Danese
Older and more recent pieces of observational evidence suggest a strong connection between QSOs and galaxies; in particular, the recently discovered correlation between black hole…
Velocity Dispersions of CNOC Clusters and the Evolution of the Cluster Abundance
S. Borgani, M. Girardi, R. G. Carlberg +2
We present the results of the analysis of the internal velocity dispersions, σ_v, for the CNOC sample of distant galaxy clusters, based on an interlopers removal algorithm, which i…
Optical Luminosities and Mass--to--Light Ratios of Nearby Galaxy Clusters
M. Girardi, S. Borgani, G. Giuricin +3
We analyze a sample of 105 clusters having virial mass homogeneously estimated and for which galaxy magnitudes are available with a well defined high degree of completeness. In par…
Massive Neutrino Decay and Shape of the Galactic Dark Halo
Srdjan Samurovic, Milan M. Cirkovic
In this Letter we investigate the basic assumptions of the decaying dark matter (DDM) theory in the light of recent advances in observational and theoretical cosmology and physics,…
Abundances of metal-weak thick-disc candidates
P. Bonifacio, M. Centurion, P. Molaro
High resolution spectra of 5 candidate metal-weak thick-disc stars suggested by Beers & Sommer-Larsen (1995) are analyzed to determine their chemical abundances. The low abundance…
Abundances in Sagittarius: present state and perspectives for the use of VLT
Piercarlo Bonifacio
Sagittarius, the nearest external galaxy, will be amenable to detailed abundance studies with VLT and other 8m class telescopes. Such data, in conjuction with the similar data of o…