19.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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127 papers · 1 filter
Search for X-ray emission from bona-fide and candidate brown dwarfs
Ralph Neuhaeuser, Cesar Briceno, Fernando Comeron +7
Following the recent classification of the X-ray detected object V410 x-ray 3 with a young brown dwarf candidate (Briceno et al. 1998) and the identification of an X-ray source in…
Extended Ly-alpha emission from a damped Ly-alpha absorber at z = 1.93, and the relation between DLAs and Lyman-break galaxies
J. U. Fynbo, P. Moller, S. J. Warren
The number of damped Ly-alpha absorbers (DLAs) currently known is about 100, but our knowledge of their sizes and morphologies is still very sparse as very few have been detected i…
Long- and short-term variability in O-star winds II. Quantitative analysis of DAC behaviour
L. Kaper, H. F. Henrichs, J. S. Nichols +1
A quantitative analysis of time series of ultraviolet spectra from a sample of 10 bright O-type stars (cf. Kaper et al. 1996, Paper I) is presented. The migrating discrete absorpti…
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 detection of extragalactic N: Consequences for nitrogen nucleosynthesis and chemical evolution
Yi-nan Chin, Christian Henkel, Norbert Langer +1
Detections of extragalactic N are reported from observations of the rare hydrogen cyanide isotope HCN toward the Large Magellanic Cloud (LMC) and the core of the (pos…
Predicted HST FOC and broad band colours for young and intermediate Simple Stellar Populations
E. Brocato, V. Castellani, G. Raimondo +1
This paper presents theoretical HST and broad band colours from population synthesis models based on an homogeneous set of stellar evolutionary tracks as computed under canonical (…
The Luminosity Function of Omega Centauri
Guido De Marchi
Deep HST-WFPC2 observations of the stellar population in the globular cluster Omega Cen (NGC 5139) have been used to measure the luminosity function of main sequence stars at the l…
The 3-D structure of the Virgo cluster from H band Fundamental Plane and Tully-Fisher distance determinations
G. Gavazzi, A. Boselli, M. Scodeggio +2
We undertook a surface photometry survey of 200 galaxies in the Virgo cluster (complete to B<14.0 mag) carried out in the near-Infrared (NIR) H band. Combining velocity dispersion…
Spectroscopy of Giants of the Sagittarius Dwarf Galaxy
P. Bonifacio, L. Pasquini, P. Molaro +1
In this paper we present the first results of the analysis of intermediate resolution () spectra of giants of the Sagittarius dwarf galaxy acquired using the ESO NTT…
Spectroscopy of red giants of the Sagittarius dwarf galaxy
G. Marconi, P. Bonifacio, L. Pasquini +1
The photometric study of the Sagittarius dwarf galaxy by Marconi et al (1998) has suggested the presence of a spread in metallicity (-0.7< [Fe/H] < -1.6), which may result from dif…
Galaxy Redshift Surveys: 20 years later
Luiz da Costa
This year marks the 20th anniversary of the effective beginning of large, systematic redshift surveys of galaxies. These surveys have had a major impact on observational cosmology…
An IR Search for Extinguished Supernovae in Starburst Galaxies
Bruce Grossan, Earl Spillar, Robert Tripp +3
IR and Radio band observations of heavily extinguished regions in starburst galaxies suggest a very high SN rate associated with such regions. Optically measured supernova (SN) rat…
Deep Imaging of AXJ2019+112: The Luminosity of a ``Dark Cluster''
Narciso Benitez, Tom Broadhurst, Piero Rosati +4
We detect a distant cluster of galaxies centered on the QSO lens and luminous X-ray source AXJ2019+112, a.k.a. ``The Dark Cluster'' (Hattori et al 1997). Using deep V,I Keck images…
ESO Imaging Survey. AXAF Field: Deep Optical-Infrared Observations, Data Reduction and Photometry
R. Rengelink, M. Nonino, L. da Costa +11
This paper presents ground-based data obtained from deep optical and infrared observations carried out at the ESO 3.5 New Technology Telescope (NTT) of a field selected for its low…
Isophot Observations of Comet Hale-Bopp: Initial Data Reduction
E. Grün, S. B. Peschke, M. Stickel +17
Comet Hale-Bopp was observed five times with ISOPHOT, the photometer on board the Infrared Space Observatory (ISO). Each time broadband photometry was performed using 4 different d…
Measurements of Omega and Lambda from 42 High-Redshift Supernovae
S. Perlmutter, G. Aldering, G. Goldhaber +29
We report measurements of the mass density, Omega_M, and cosmological-constant energy density, Omega_Lambda, of the universe based on the analysis of 42 Type Ia supernovae discover…
VLT and HST observations of a candidate high redshift elliptical galaxy in the Hubble Deep Field South
M. Stiavelli, T. Treu, C. M. Carollo +8
The combined use of the ESO Very Large Telescope (VLT) UT1 Science Verification (SV) images and of the Hubble Space Telescope (HST) Hubble Deep Field South observations allows us t…
New catalogue of Wolf-Rayet galaxies and high-excitation extra-galactic HII regions
Daniel Schaerer, Thierry Contini, Maximilien Pindao
We present a new compilation of Wolf-Rayet (WR) galaxies and extra-galactic HII regions showing BROAD HeII emission drawn from the literature. Relevant information on the presence…
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…
Detection of Evolved High-Redshift Galaxies in Deep NICMOS/VLT Images
Narciso Benitez, Tom Broadhurst, Rychard Bouwens +2
A substantial population of high redshift early-type galaxies is detected in very deep UBVRIJHK images towards the HDF-South. Four elliptical profile galaxies are identified in the…
Discovery of distant high luminosity infrared galaxies
Paul P. van der Werf, D. L. Clements, P. A. Shaver +1
We have developed a method for selecting the most luminous galaxies detected by IRAS based on their extreme values of R, the ratio of 60 micron and B-band luminosity. These objects…
Towards an Understanding of the Globular Cluster Over--abundance around the Central Giant Elliptical NGC 1399
Markus Kissler-Patig, Carl J. Grillmair, Georges Meylan +3
We investigate the kinematics of a combined sample of 74 globular clusters around NGC 1399. Their high velocity dispersion, increasing with radius, supports their association with…
Distant clusters of galaxies in the ESO Imaging Survey
M. Scodeggio, L. F. Olsen, L. N. da Costa
The results of a search for distant clusters of galaxies performed using the I-band data obtained by the ESO Imaging Survey (EIS) are presented. Cluster candidates are identified u…
The MACHO Project Large Magellanic Cloud Variable Star Inventory. VIII. The Recent Star Formation History of the LMC from the Cepheid Period Distribution
C. Alcock, R. A. Allsman, D. R. Alves +20
We present an analysis of the period distribution of Cepheids in the Large Magellanic Cloud, based on data obtained by the MACHO microlensing experiment and on a previo…