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43 papers · 1 filter
EROS differential studies of Cepheids in the Magellanic Clouds : Stellar pulsation, stellar evolution and distance scale
J. P. Beaulieu, D. D. Sasselov
We present a differential study of 500 Magellanic Cepheids with 3 million measurements obtained as a by-product of the EROS microlensing survey. The data-set is unbiased and provid…
UV HST Spectroscopy of Star-Forming Galaxies
D. Kunth, J. Lequeux, J. M. Mas-Hesse +2
HST spectroscopical observations of 8 HII galaxies are reported. Ly alpha emission was detected in 4 of them. We find that the velocity structure of the gas is the main determining…
Extended Perturbation Theory for the Local Density Distribution Function
S. Colombi, F. Bernardeau, F. R. Bouchet +1
Perturbation theory makes it possible to calculate the probability distribution function (PDF) of the large scale density field in the small variance limit. For top hat smoothing a…
Galaxy evolution at low redshift? II. Number counts and optical identifications of faint IRAS sources
E. Bertin, M. Dennefeld, M. Moshir
We analyse a Far InfraRed (FIR) catalogue of galaxies at 60 microns with a flux limit of approx. 110 mJy, extracted from a deep subsample of the IRAS Faint Source Survey. Monte-Car…
The Surface Density Profiles and Lensing Characteristics of Hickson's Compact Groups of Galaxies
M. L. Montoya, R. Dominguez-Tenreiro, G. Gonzalez-Casado +2
A statistical method is developed to infer the typical density profiles of poor galaxy systems without resort to binning of data or assuming a given center to each system. The meth…
The evolution of ultraviolet emission lines from the circumstellar material surrounding SN 1987A
G. Sonneborn, C. Fransson, P. Lundqvist +5
The presence of narrow high-temperature emission lines from nitrogen-rich gas close to SN 1987A has been the principal observational constraint on the evolu- tionary status of the…
The rich cluster of galaxies ABCG 85.I. X-ray analysis
V. Pislar, F. Durret, D. Gerbal +2
We present an X-ray analysis of the rich cluster ABCG 85 based on ROSAT PSPC data. By applying an improved wavelet analysis, we show that our view of this cluster is notably change…
Recent Advances in Gravitational Lensing
Y. Mellier, L. van Waerbeke, F. Bernardeau +1
The gravitational lensing effect is one of the most promising tools for cosmology. Indeed it probes directly the total mass distribution in large-scale structures and can as well p…
Field #3 of the Palomar-Groningen Survey I. Variable stars at the edge of the Sagittarius dwarf galaxy
Y. K. Ng, M. Schultheis
A catalogue is presented with variable (RR Lyrae, semiregular and Mira) stars located inside field #3 of the Palomar-Groningen Survey, at the outer edge of the Sagittarius dwarf ga…
Weak Lensing Statistics as a Probe of Omega and Power Spectrum
F. Bernardeau, L. van Waerbeke, Y. Mellier
The possibility of detecting weak lensing effects from deep wide field imaging surveys has open new means of probing the large-scale structures of the Universe and measuring cosmol…
The Omega dependence of the velocity divergence distribution
F. Bernardeau, R. van de Weygaert, E. Hivon +1
Analytical studies based on perturbative theory have shown that the moments of the Probability Distribution Function (PDF) of the local smoothed velocity divergence are expected to…
The Effects of an Early Galactic Wind on the Evolution of D, \he3 and Z
Sean Scully, Michel Cassé, Keith A. Olive +1
The predictions of the abundances of D and \he3 from Big Bang Nucleosynthesis (BBN) and recent observations of these two isotopes suggest the need to develop new chemical evolution…
Gravitational Lensing and the Redshift Distribution of galaxies
Y. Mellier
In addition to the determination of the mass distribution of lenses (see P. Schneider, this conference), strong and weak lensing can also be powerfull tools to analyse the redshift…
A photometric catalogue of the Coma cluster core
C. Lobo, A. Biviano, F. Durret +4
We have obtained a mosaic of CCD images of the Coma cluster in the V-band covering a region of approximately 0.4 degrees around both central cluster galaxies NGC 4889 and NGC 4…
Clustering of absorption line systems
Patrick Petitjean
Absorption line systems are luminosity unbiased tracers of the spatial distribution of baryons over most of the history of the Universe. I review the importance of studying the clu…
Weak lensing at the limit of the sky background noise
Y. Mellier, B. Fort
Recent weak lensing observations have pushed the use of 4 meter-class telescopes to the limits of their capabilities with exposure times exceeding several hours. The leading idea i…
The HST Quasar Absorption Line Key Project XII. The Unusual Absorption Line System in the Spectrum of PG 2302+029 ---Ejected or Intervening?
B. T. Jannuzi, G. F. Hartig, S. Kirhakos +9
We report the discovery of a high-ionization broad absorption line system at a redshift of z_abs=0.695 in the spectrum of the z_em=1.052 radio-quiet quasar PG 2302+039. Broad absor…
The DENIS & 2MASS Near Infrared Surveys
Gary Mamon
The DENIS and 2MASS near infrared surveys are presented. Their applications in extragalactic astronomy and cosmology are listed. The prospects for a rapid spectroscopic followup su…
Molecular gas and dust around a radio-quiet quasar at redshift 4.7
Alain Omont, Patrick Petitjean, Stephane Guilloteau +3
We report the detection of emission from dust and carbon monoxide in the radio-quiet quasar BR1202--0725 at redshift z=4.7. Maps of these emissions reveal two objects separated by…
LiBeB: High and low energy cosmic ray production and comparison with neutrino induced nucleosynthesis in SNII
R. Ramaty, H. Reeves, R. E. Lingenfelter +1
We present new calculations of LiBeB production by accelerated particles with various compositions and energy spectra ranging from low energies to relativistic energies, and variou…
On the extinction towards Baade's Window
Y. K. Ng, G. Bertelli
An analysis is made on the morphology of the sequences, formed by stars distributed along the line of sight in (V,V--I) colour-magnitude diagrams from Baade's Window (l=1.0,b=-3.9)…
Stellar population synthesis
Y. K. Ng
Monte-Carlo simulations of optical and near-infrared colour-magnitude diagrams in Baade's Window (l=1.0,b=-3.9) are compared with each other. The morphological structure of the red…
Colour-Magnitude Diagrams from microlensing projects and galactic structure
Y. K. Ng
The results, obtained with the stellar population synthesis technique, are summarized for galactic structure and stellar population studies of our Galaxy. Emphasis is put on the an…
V- and I-band observations of the halo of NGC 5907
J. Lequeux, B. Fort, M. Dantel-Fort Fort +2
Using long exposures taken in the V and I bands with a 40964096 pixel CCD array at the prime focus of the Canada-France-Hawaii telescope, we have confirmed the discovery by…