Search Publications
Evolution of asymptotic giant branch stars. II. Optical to far-infrared isochrones with improved TP-AGB models
Bressan, A.; Girardi, L.; Granato, G. L. +3 more
We present a large set of theoretical isochrones, whose distinctive features mostly reside on the greatly-improved treatment of the thermally-pulsing asymptotic giant branch (TP-AGB) phase. Essentially, we have coupled the TP-AGB tracks described in Paper I, at their stages of pre-flash quiescent H-shell burning, with the evolutionary tracks for t…
Extragalactic optical-infrared background radiation, its time evolution and the cosmic photon-photon opacity
Rodighiero, G.; Franceschini, A.; Vaccari, M.
Context: The background radiation in the optical and the infrared cause energy loss in the propagation of high energy particles through space. In particular, TeV observations with Cherenkov telescopes of extragalactic sources are influenced by the opacity effects due to the interaction of the very high-energy source photons with the background lig…
GMASS ultradeep spectroscopy of galaxies at z ~ 2. II. Superdense passive galaxies: how did they form and evolve?
Berta, S.; Cimatti, A.; Daddi, E. +13 more
Aims: The aim of this work is to investigate the physical, structural and evolutionary properties of old, passive galaxies at z > 1.4 and to place new constraints on massive galaxy formation and evolution.
Methods: We combine ultradeep optical spectroscopy from the GMASS project (Galaxy Mass Assembly ultradeep Spectroscopic Survey) with GOO…
Rayleigh scattering in the transit spectrum of HD 189733b
Pont, F.; Vidal-Madjar, A.; Lecavelier Des Etangs, A. +1 more
The transit spectrum of the exoplanet HD 189733b has recently been obtained between 0.55 and 1.05 µm. Here we present an analysis of this spectrum. We develop first-order equations to interpret absorption spectra. In the case of HD 189733b, we show that the observed slope of the absorption as a function of wavelength is characteristic of ext…
A catalog of galaxy clusters observed by XMM-Newton
Davis, D. S.; Mushotzky, R. F.; Kuntz, K. D. +1 more
Aims:We present a uniform catalog of the images and radial profiles of the temperature, abundance, and brightness for 70 clusters of galaxies observed by XMM-Newton.
Methods: We use a new “first principles” approach to the modeling and removal of the background components; the quiescent particle background, the cosmic diffuse emission, the sof…
The great observatories origins deep survey. VLT/FORS2 spectroscopy in the GOODS-South field: Part III
Popesso, P.; Cesarsky, C.; Stern, D. +15 more
Aims:We present the full data set of the spectroscopic campaign of the ESO/GOODS program in the GOODS-South field, obtained with the FORS2 spectrograph at the ESO/VLT.
Methods: Objects were selected as candidates for VLT/FORS2 observations primarily based on the expectation that the detection and measurement of their spectral features would be…
Evidence for powerful AGN winds at high redshift: dynamics of galactic outflows in radio galaxies during the ``Quasar Era''
De Breuck, C.; van Breugel, W.; Lehnert, M. D. +2 more
AGN feedback now appears as an attractive mechanism to resolve some of the outstanding problems with the “standard” cosmological models, in particular those related to massive galaxies. At low redshift, evidence is growing that gas cooling and star formation may be efficiently suppressed by mechanical energy input from radio sources. To directly c…
The first XMM-Newton slew survey catalogue: XMMSL1
Altieri, B.; Read, A. M.; Esquej, P. +3 more
Aims:We report on the production of a large area, shallow, sky survey, from XMM-Newton slews. The great collecting area of the mirrors coupled with the high quantum efficiency of the EPIC detectors have made XMM-Newton the most sensitive X-ray observatory flown to date. We use data taken with the EPIC-pn camera during slewing manoeuvres to perform…
Ground-based detection of sodium in the transmission spectrum of exoplanet HD 209458b
Snellen, I. A. G.; Albrecht, S.; Le Poole, R. S. +1 more
Context: The first detection of an atmosphere around an extrasolar planet was presented by Charbonneau and collaborators in 2002. In the optical transmission spectrum of the transiting exoplanet HD 209458b, an absorption signal from sodium was measured at a level of 0.023 ± 0.006%, using the STIS spectrograph on the Hubble Space Telescope. Despite…
CoRoT sounds the stars: p-mode parameters of Sun-like oscillations on HD 49933
Auvergne, M.; Baudin, F.; Jiménez-Reyes, S. J. +19 more
Context: The first asteroseismology results from CoRoT are presented, on a star showing Sun-like oscillations. We have analyzed a 60 day lightcurve of high-quality photometric data collected by CoRoT on the F5 V star HD 49933. The data reveal a rich spectrum of overtones of low-degree p modes.
Aims: Our aim was to extract robust estimates of t…