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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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64 papers · 1 filter
Populations of WC and WN stars in WR galaxies: new constraints on starburst parameters
Thierry Contini, Daniel Schaerer, Daniel Kunth
Detection and analysis of Wolf-Rayet (WR) star populations in young starbursts is a powerful tool to reveal the properties of the star-forming events. We present new high S/N optic…
The rich cluster of galaxies ABCG~85. IV. Emission line galaxies, luminosity function and dynamical properties
F. Durret, D. Gerbal, C. Lobo +1
This paper is the fourth of a series dealing with the cluster of galaxies ABCG 85. Using our two extensive photometric and spectroscopic catalogues (with 4232 and 551 galaxies resp…
Photometric stellar variation due to extra-solar comets
A. Lecavelier des Etangs, A. Vidal-Madjar, R. Ferlet
We performed numerical simulations of stellar occultations by extra-solar cometary tails. We find that extra-solar comets can be detected by the apparent photometric variations of…
Gas-Rich Local Dwarf Star-Forming Galaxies and their connection with the Distant Universe
Daniel Kunth
I discuss the properties of gas-rich forming galaxies. I particularly emphasize the latest results on Lyman alpha emission that are relevant to the search of distant young galaxies…
Globular Clusters in Blue Compact Galaxies as Tracers of the Starburst History
G. Östlin
Representing single stellar populations, globular clusters (GCs) are relatively easy to model, thus providing powerful tools for studying the evolution of galaxies. This has been d…
Probing the Universe with Weak Lensing
Y. Mellier
Gravitational lenses can provide crucial information on the geometry of the Universe, on the cosmological scenario of formation of its structures as well as on the history of its c…
Identification of absorbing galaxies towards the QSO J2233-606 in the Hubble Deep Field South
L. Tresse, M. Dennefeld, P. Petitjean +2
We present spectroscopic observations of galaxies lying within 1' from the QSO J2233-606 in the HDF-S. Several are found to be coincident in redshift with absorption line systems s…
A comprehensive study of intense star formation bursts in irregular and compact galaxies
J. M. Mas-Hesse, D. Kunth
We have analyzed the properties of the star formation episodes taking place in a sample of Blue Compact and Irregular galaxies by comparing their multiwavelength observational prop…
Faint Gigahertz peaked spectrum sources and the evolution of young radio sources
I. A. G. Snellen, R. T. Schilizzi, G. K. Miley +3
GPS sources are the objects of choice to study the initial evolution of extragalactic radio sources, since it is most likely that they are the young counterparts of large scale rad…
Lithium-6 : Evolution from Big Bang to Present
Elisabeth Vangioni-Flam, Michel Casse, Roger Cayrel +3
The primordial abundances of Deuterium, he4, and li7 are crucial to determination of the baryon density of the Universe in the framework of standard Big Bang nucleosynthesis (BBN).…
Nuclear Photodisintegration at High Redshifts by Gamma-Ray Blazars
M. Casse, E. Vangioni-Flam, R. Lehoucq
We analyse the photodisintegration of nuclei near the center of blazars, in particular PKS 0528+134. We show that this process could explain the recent observation of a high Al/Si…
Deep Galaxy survey at 6.75 micron with the ISO satellite
H. Flores, F. Hammer, F. X. Désert +8
Deep 6.75um mid-IR ISOCAM observations were obtained of the Canada-France Redshift Survey (CFRS) 1415+52 field with the Infrared Space Observatory. The identification of the source…
QSO Absorption Line Systems
Patrick Petitjean
It is difficult to describe in a few pages the numerous specific techniques used to study absorption lines seen in QSO spectra and to review even rapidly the field of research base…
The effect of point sources on satellite observations of the cosmic microwave background
M. P. Hobson, R. B. Barreiro, L. Toffolatti +4
We study the effect of extragalactic point sources on satellite observations of the cosmic microwave background (CMB). In order to separate the contributions due to different foreg…
The Cosmic Distribution of Clustering
S. Colombi, I. Szapudi, the VIRGO consortium
For a given statistic, A, the cosmic distribution function, Upsilon(VA), is the probability of measuring a value VA in a finite galaxy catalog. For statistics related to count-in-c…
Photoelectric heating for dust grains at high redshifts
Biman Nath, Shiv Sethi, Yuri Shchekinov
Lyman- absorption systems at with $N_{HI} \ga 3 \times 10^{14}$ cm have been found to be enriched with a mean metallicity of , and…
Populations of WC and WN stars in Wolf-Rayet galaxies
Daniel Schaerer, Thierry Contini, Daniel Kunth
We report the detection of WC stars in 5 Wolf-Rayet (WR) galaxies: He 2-10, NGC 3049, NGC 3125, NGC 5253 and Tol 89. The faint broad CIV5808 line requires sufficiently high S/N to…
Evolution of Elliptical Galaxies in a Hierarchical Universe
Guinevere Kauffmann, Stephane Charlot
In hierarchical models of galaxy formation, ellipticals form from the merging of disk galaxies drawn together by gravity as their surrounding dark halos coalesce. Using semi-analyt…
Black Hole and Neutron Star Transients in Quiescence
Kristen Menou, Ann A. Esin, Ramesh Narayan +3
We consider the X-ray luminosity difference between neutron star and black hole soft X-ray transients (NS and BH SXTs) in quiescence. The current observational data suggest that BH…
Near infrared observations of quasars with extended ionized envelopes
I. Marquez, F. Durret, P. Petitjean
We have observed a sample of 15 and 8 quasars with redshifts between 0.11 and 0.87 (mean value 0.38) in the J and K' bands respectively. Eleven of the quasars were previously known…
Multi-frequency Wiener filtering of CMB data with polarisation
F. R. Bouchet, S. Prunet, S. K. Sethi
One goal of CMB data analysis is to combine data at different frequencies, angular resolutions, and noise levels in order to best extract the component with a Plankian spectral beh…
Dust in 3C324
P. N. Best, H. J. A. R"ottgering, M. N. Bremer +6
The results of a deep submillimetre observation using SCUBA of the powerful radio galaxy 3C324, at redshift z=1.206, are presented. At 850 microns, emission from the location of th…
The Lyman-alpha emission in local Star-Forming Galaxies: Scenario and Connection with Primeval Galaxies
D. Kunth, E. Terlevich, R. Terlevich +1
We review the Lyan alpha emission in local star-forming galaxies. In most cases as already shown by the IUE, the emission is absent or much weaker than expected. This occurs becaus…
Biasing and high-order statistics from the SSRS2
C. Benoist, A. Cappi, L. N. da Costa +3
We analyze different volume-limited samples extracted from the Southern Sky Redshift Survey (SSRS2), using counts-in-cells to compute the Count Probability Distribution Function (C…