Thierry Contini

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Observations of distant supernovae indicate that the Universe is now in a phase of accelerated expansion the physical cause of which is a mystery. Formally, this requires the inclusion of a term acting as a negative pressure in the equations of cosmic expansion, accounting for about 75 per cent of the total energy density in the Universe. The simplest(More)
To understand the evolution of galaxies, we need to know as accurately as possible how many galaxies were present in the Universe at different epochs. Galaxies in the young Universe have hitherto mainly been identified using their expected optical colours, but this leaves open the possibility that a significant population remains undetected because their(More)
We present spectroscopic redshifts of a large sample of galaxies with I AB < 22.5 in the COSMOS field, measured from spectra of 10,644 objects that have been obtained in the first two years of observations in the zCOSMOS-bright redshift survey. These include a statistically complete subset of 10,109 objects. The average accuracy of individual redshifts is(More)
We report the detection of WC stars in five Wolf-Rayet (W-R) galaxies: He 2-10, NGC 3049, NGC 3125, NGC 5253 and Tol 89. The faint broad C iv λ5808 line requires sufficiently high S/N (> ∼ 40) to be detected explaining the non-detection of this WC feature in previous observations. From the measurement of W-R emission lines (N iii λ4640+C iii λ4650, He ii(More)
We present a study of the host galaxies of active galactic nucleus (AGN) selected from the zCOSMOS survey to establish if accretion onto supermassive black holes (SMBHs) and star formation are explicitly linked up to z ∼ 1. We identify 152 galaxies that harbor AGN, based on their X-ray emission (L 0.5–10 keV > 10 42 erg s −1) detected by XMM-Newton(More)
  • zCOSMOS SURVEY, A. Merloni, +44 authors D. Vergani
  • 2009
We report on the measurement of the physical properties (rest-frame K-band luminosity and total stellar mass) of the hosts of 89 broad-line (type-1) active galactic nuclei (AGNs) detected in the zCOSMOS survey in the redshift range 1 < z < 2.2. The unprecedented multi-wavelength coverage of the survey field allows us to disentangle the emission of the host(More)
Context. Identifying the main processes of galaxy assembly at high redshifts is still a major issue to understand galaxy formation and evolution at early epochs in the history of the Universe. Aims. This work aims to provide a first insight into the dynamics and mass assembly of galaxies at redshifts 1.2 < z < 1.6, the early epoch just before the sharp(More)
Context. We present the results of an imaging programme of distant galaxies (z ∼ 0.8) at high spatial resolution (∼ 0.1 ") aiming at studying their morphological evolution. We observed 7 fields of 1 ′ × 1 ′ with the NACO Adaptive Optics system (VLT) in Ks (2.16µm) band with typical V ∼ 14 guide stars and 3h integration time per field. Observed fields are(More)
It is known that the shape of a planet (oblateness, rings, etc.) slightly modifies the shape of the transit light curve. The forthcoming space missions (Corot, Kepler), able to detect the transit of Earth-like planets, could a fortiori also detect the transit of artificial planet-size objects if their shape is significantly different from a natural(More)
We present the gas-phase oxygen abundance (O/H) for a sample of 129 star-forming galaxies at intermediate redshifts (0.2 < z < 1.0). The sample selection, the spectroscopic observations (mainly with VLT/FORS) and associated data reduction, the photometric properties, the emission-line measurements, and the spectral classification are fully described in a(More)