Search Publications
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…
Homogeneous studies of transiting extrasolar planets - I. Light-curve analyses
Southworth, John
I present a homogeneous analysis of the transit light curves of 14 well-observed transiting extrasolar planets. The light curves are modelled using JKTEBOP, random errors are measured using Monte Carlo simulations and the effects of correlated noise are included using a residual-permutation algorithm. The importance of stellar limb darkening on th…
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 Structure of Classical Bulges and Pseudobulges: the Link Between Pseudobulges and SÉRSIC Index
Drory, Niv; Fisher, David B.
In this paper, we study the properties of pseudobulges (bulges that appear similar to disk galaxies) and classical bulges (bulges which appear similar to E-type galaxies) in bulge-disk decompositions. We show that the distribution of bulge Sérsic indices, nb , is bimodal, and this bimodality correlates with the morphology of the bulge. …
Cosmic Variance and Its Effect on the Luminosity Function Determination in Deep High-z Surveys
Trenti, M.; Stiavelli, M.
We study cosmic variance in deep high-redshift surveys and its influence on the determination of the luminosity function for high-redshift galaxies. For several survey geometries relevant for Hubble Space Telescope (HST) and James Webb Space Telescope (JWST) instruments, we characterize the distribution of the galaxy number counts. This is obtaine…
The c2d Spitzer Spectroscopic Survey of Ices around Low-Mass Young Stellar Objects. I. H2O and the 5-8 µm Bands
Augereau, J. -C.; Stapelfeldt, K. R.; van Dishoeck, E. F. +23 more
To study the physical and chemical evolution of ices in solar-mass systems, a spectral survey is conducted of a sample of 41 low-luminosity YSOs (L ~ 0.1-10 L⊙) using 3-38 µm Spitzer and ground-based spectra. The sample is complemented with previously published Spitzer spectra of background stars and with ISO spectra of well-studi…
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…
Multi-instrument analysis of electron populations in Saturn's magnetosphere
Schippers, P.; André, N.; Gurnett, D. A. +10 more
We analyze the radial distribution of electron populations inside 20 Rs in Saturn's magnetosphere, and we calculate moments for these populations by a forward modeling method using composite spectra produced by the CAPS/ELS (0.6 eV to 26 keV) and the MIMI/LEMMS (15 keV to 10 MeV) instruments on board Cassini. We first calculate and harm…
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 ACS Virgo Cluster Survey. XV. The Formation Efficiencies of Globular Clusters in Early-Type Galaxies: The Effects of Mass and Environment
Jordán, Andrés; Tonry, John L.; Côté, Patrick +8 more
The fraction of stellar mass contained in globular clusters (GCs), also measured by number as the specific frequency, is a fundamental quantity that reflects both a galaxy's early star formation and its entire merging history. We present specific frequencies, luminosities, and mass fractions for the globular cluster systems of 100 early-type galax…