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44 papers · 1 filter
A method for optimal image subtraction
C. Alard, R. H. Lupton
We present a new method designed for optimal subtraction of two images with different seeing. Using image subtraction appears to be essential for the full analysis of the microlens…
Star Formation Histories versus Redshift : Consequences for Overall Metallicity and Deuterium Destruction
Michel Casse, Keith A. Olive, Elisabeth Vangioni-Flam +1
The flood of new data on deep surveys, and above all the CFRS (Canada-France-Redshift-Survey), has had a great impact on studies of galactic evolution. On the basis of cosmological…
AGAPEROS: Searches for microlensing in the LMC with the Pixel Method. I. Data treatment and pixel light curves production
A. -L. Melchior
Recent surveys monitoring millions of light curves of resolved stars in the LMC have discovered several microlensing events. Unresolved stars could however significantly contribute…
Large-Scale Structures Behind the Milky Way from Near-IR Surveys
R. C. Kraan-Korteweg, A. Schroeder, G. A. Mamon +1
About 25% of the optical extragalactic sky is obscured by the dust and stars of our Milky Way. Dynamically important structures might still lie hidden in this zone. Various approac…
The ESO-Sculptor Survey: Spectral classification of galaxies with z < 0.5
Gaspar Galaz, Valerie de Lapparent
Using the ESO-Sculptor galaxy redshift survey data (ESS), we have extensively tested the Principal Components Analysis (PCA) method to perform the spectral classification of galaxi…
Effects of Sampling on Statistics of Large Scale Structure
S. Colombi, I. Szapudi, A. S. Szalay
The effects of sampling are investigated on measurements of counts-in-cells in three-dimensional magnitude limited galaxy surveys, with emphasis on moments of the underlying smooth…
The second detection of CO at redshift larger than 4
Stephane Guilloteau, Alain Omont, Richard G. McMahon +2
We report the detection with the IRAM interferometer at 3mm of J=5-4 CO line in the radio quiet quasar BRI1335-0415 at redshift of z=4.41. After BR1202-0725 at z=4.69 (Ohta etal 19…
Semi-analytic modelling of galaxy evolution in the IR/submm range
B. Guiderdoni, E. Hivon, F. R. Bouchet +1
This paper proposes a new semi-analytic modelling of galaxy properties in the IR/submm wavelength range, which is explicitly set in a cosmological framework. This type of approach…
The Inner Galaxy resolved at IJK using DENIS data
M. Unavane, Gerard Gilmore, N. Epchtein +3
We present the analysis of three colour optical/near-infrared images, in IJK, taken for the DENIS project. The region considered covers 17.4 square deg and lies within |l|<5 deg, |…
Near infrared star counts as a test of Galactic bar structure
M. Unavane, Gerard Gilmore
We present survey data in the narrow-band L filter (nbL), taken at UKIRT, for a total area of 277 square arcmin, roughly equally divided between four regions at zero Galactic latit…
ROSAT All-Sky Survey observations of IRAS galaxies; I. Soft X-ray and far-infrared properties
Th. Boller, F. Bertoldi, M. Dennefeld +1
The 120,000 X-ray sources detected in the RASS II processing of the ROSAT All-Sky Survey are correlated with the 14,315 IRAS galaxies selected from the IRAS Point Source Catalogue:…
A complete infrared Einstein ring in the gravitational lens system B1938+666
L. J. King, N. J. Jackson, R. D. Blandford +8
We report the discovery, using NICMOS on the Hubble Space Telescope, of an arcsecond-diameter Einstein ring in the gravitational lens system B1938+666. The lensing galaxy is also d…
A photometric catalogue of galaxies in the cluster Abell 85
E. Slezak, F. Durret, J. Guibert +1
We present two catalogues of galaxies in the direction of the rich cluster \a85. The first one includes 4,232 galaxies located in a region from the cluster centre. It…
A catalogue of velocities in the cluster of galaxies Abell 85
F. Durret, P. Felenbok, C. Lobo +1
We present a catalogue of velocities for 551 galaxies (and give the coordinates of 39 stars misclassified as galaxies in our photometric plate catalogue) in a region covering about…
Lyman-alpha emission as a tool to study high redshift damped systems
O. Puyoo, L. Ben-Jaffel
We report a quantitative study of the escape of Lyman-alpha photons from an inhomogeneous optically thick medium that mimics the structure of damped Lyman-alpha absorbers. Modeling…
Evolution of the Lyman-alpha forest from high to low redshift
R. Riediger, P. Petitjean, J. P. Muecket
We study the evolution with redshift, from z=5 to z=0, of the Lyman-alpha forest in a CDM model using numerical simulations including collisionless particles only. The baryonic com…
Bursting dwarf galaxies from the far-UV and deep surveys
Michel Fioc, Brigitte Rocca-Volmerange
The far-ultraviolet (UV) counts and the deep optical spectroscopic surveys have revealed an unexpected number of very blue galaxies (vBG). Using constraints from the UV and optical…
A High Deuterium Abundance at z=0.7
J. K. Webb, R. F. Carswell, K. M. Lanzetta +4
Of the light elements, the primordial abundance of deuterium, (D/H)_p, provides the most sensitive diagnostic for the cosmological mass density parameter Omega_B. Recent high redsh…
Dark baryons and rotation curves
A. Burkert, J. Silk
The best measured rotation curve for any galaxy is that of the dwarf spiralXXXX DDO 154, which extends out to about 20 disk scale lengths. It provides an ideal laboratory for testi…
Merging History Trees of Dark Matter Haloes: a Tool for Exploring Galaxy Formation Models
Boudewijn F. Roukema, Bruce A. Peterson, Peter J. Quinn +1
A method of deriving and using merging history trees of dark matter galaxy haloes directly from pure gravity N-body simulations is presented. This combines the full non-linearity o…
The dynamical status of Stephan's Quintet
M. Moles, J. W. Sulentic, I. Márquez
Multiwavelength data for Stephan's Quintet (SQ) are consistent with the following model for this compact galaxy group. (1) Discordant redshift NGC 7320 is an unrelated foreground g…
An X-ray Size-Temperature Relation for Galaxy Clusters: Observation and Simulation
Joseph J. Mohr, August E. Evrard
We show that galaxy clusters conform to a tight relation between X-ray isophotal size R_I and emission weighted intracluster medium (ICM) temperature T_X. The best fit relation for…
Constraining the Mass Distribution of Cluster Galaxies by Weak Lensing
Bernhard Geiger, Peter Schneider
Analysing the weak lensing distortions of the images of faint background galaxies provides a means to constrain the average mass distribution of cluster galaxies and potentially to…
The rich cluster of galaxies ABCG 85. II. X-ray analysis using the ROSAT HRI
G. B. Lima Neto, V. Pislar, F. Durret +2
We present a new X-ray analysis mainly based on ROSAT HRI data. The HRI spatial resolution combined with an improved wavelet analysis method and with complementary radio and optica…