Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR2k papers
- University of British ColumbiaCA1.9k papers
- McGill UniversityCA1.9k papers
- University of VictoriaCA1.8k papers
- University of California, Santa CruzUS1.7k papers
- Rutherford Appleton LaboratoryGB1.7k papers
- University of ManchesterGB1.7k papers
- Queen Mary University of LondonGB1.7k papers
- University of PisaIT1.6k papers
- University of EdinburghGB1.6k papers
- University of BirminghamGB1.6k papers
- Heidelberg UniversityDE1.6k papers
29 papers · 2 filters
Cosmic Star Formation History and its Dependence on Galaxy Stellar Mass
S. Juneau, K. Glazebrook, D. Crampton +11
We examine the cosmic star formation rate (SFR) and its dependence on galaxy stellar mass over the redshift range 0.8 < z < 2 using data from the Gemini Deep Deep Survey (GDDS). Th…
TeV Emission from the Galactic Center Black-Hole Plerion
Armen Atoyan, Carles D. Dermer
The HESS collaboration recently reported highly significant detection of TeV gamma-rays coincident with Sgr A*. In the context of other Galactic Center (GC) observations, this poin…
White Dwarfs and Hot Subdwarfs as Seen from FUSE
G. Fontaine, P. Chayer
We present a small collection of FUSE spectra representative of the main spectral classes found in white dwarf stars. In addition, we also discuss another family of hot evolved sta…
Accurate determination of the mass distribution in spiral galaxies III. Fabry-Perot imaging spectroscopy of 6 spiral galaxies
S. Blais-Ouellette, P. Amram, C. Carignan +1
High resolution Fabry-Perot data of six spiral galaxies are presented. Those data extend the previous sample of spiral galaxies studied with high resolution 3D spectroscopy to earl…
Rotation-induced mixing in red giant stars
A. Palacios, C. Charbonnel, S. Talon +1
Red giant stars, both in the field and in globular clusters, present abundance anomalies that can not be explained by standard stellar evolution models. Some of these peculiarities…
Discovery of a Cool, Massive, and Metal-Rich DAZ White Dwarf
A. Gianninas, P. Dufour, P. Bergeron
We report the discovery of a new metal-rich DAZ white dwarf, GD 362. High signal-to-noise optical spectroscopy reveals the presence of spectral lines from hydrogen as well as CaI,…
Differential rotation of the active G5V star Kappa1 Ceti: Photometry from the MOST satellite
Slavek M. Rucinski, Gordon A. H. Walker, Jaymie M. Matthews +8
About 30.5 days of nearly uninterrupted broadband photometry of the solar-type star Kappa1 Ceti, obtained with the MOST (Microvariability & Oscillations of STars) satellite, shows…
An update on the SCUBA-2 project
Michael Audley, Wayne Holland, Trevor Hodson +16
SCUBA-2, which replaces SCUBA (the Submillimeter Common User Bolometer Array) on the James Clerk Maxwell Telescope (JCMT) in 2006, is a large-format bolometer array for submillimet…
The r-process nucleosynthesis: a continued challenge for nuclear physics and astrophysics
S. Goriely, P. Demetriou, H. -Th. Janka +2
The identification of the astrophysical site and the specific conditions in which r-process nucleosynthesis takes place remain unsolved mysteries of astrophysics. The present paper…
Probing Halos of Galaxies at Very Large Radii using Background QSOs
Stephanie Cote, Rosemary Wyse, Claude Carignan +2
(ABRIDGED) Gaseous halos of nine nearby galaxies (with redshifts cz < 6000 km/s) were probed at large galactocentric radii using background quasars observed with HST GHRS and STIS.…
Polarimetric variations of binary stars. VI. Orbit-induced variations in the pre-main-sequence binary AK Sco
N. Manset, P. Bastien, C. Bertout
We present simultaneous UBV polarimetric and photometric observations of the pre-main-sequence binary AK Sco, obtained over 12 nights, slightly less than the orbital period of 13.6…
Differential Imaging with a Multicolor Detector Assembly: A New ExoPlanet Finder Concept
C. Marois, R. Racine, R. Doyon +2
Simultaneous spectral differential imaging is a high contrast technique by which subtraction of simultaneous images reduces noise from atmospheric speckles and optical aberrations.…
Implications of WMAP observations on Li abundance and stellar evolution models
Olivier Richard, Georges Michaud, Jacques Richer
The WMAP determination of the baryon-to-photon ratio implies, through Big Bang nucleosynthesis, a cosmological Li abundance larger, by a factor of 2 to 3, than the Li abundance pla…
Fourier transform method for imaging atmospheric Cherenkov telescopes
A. Atoyan, J. Patera, V. Sahakian +1
We propose Fourier transform (FT) method for processing images of extensive air showers (EAS) detected by imaging atmospheric Cherenkov telescopes (IACT) used in the very high ener…
The Compact Group of Galaxies HCG 31 is in an early phase of merging
P. Amram, C. Mendes de Oliveira, H. Plana +1
We have obtained high spectral resolution (R = 45900) Fabry-Perot velocity maps of the Hickson Compact Group HCG 31 in order to revisit the important problem of the merger nature o…
L3CCD results in pure photon counting mode
Olivier Daigle, Jean-Luc Gach, Christian Guillaume +3
Theoretically, L3CCDs are perfect photon counting devices promising high quantum efficiency (90%) and sub-electron readout noise (<0.1 e-). We discuss how a back-thinned 5…
Bar Parameters From Halpha Observations: Tremaine-Weinberg method with Halpha velocity fields
O. Hernandez, C. Carignan, P. Amram +1
The very first results of the application of the Tremaine-Weinberg (hereafter TW) method on Halpha velocity fields are presented to find pattern speeds of galaxies. The technique i…
The Formation Rate, Mass and Luminosity Functions of DA White Dwarfs from the Palomar Green Survey
J. Liebert, P. Bergeron, J. B Holberg
Spectrophotometric observations at high signal-to-noise ratio were obtained of a complete sample of 347 DA white dwarfs from the Palomar Green (PG) Survey. Fits of observed Balmer…
GIRAFFE multiple integral field units at VLT: a unique tool to recover velocity fields of distant galaxies
H. Flores, M. Puech, F. Hammer +2
The GIRAFFE spectrograph is unique in providing the integral field spectroscopy of fifteen distant galaxies at the same time. It has been successfully implemented at the second VLT…
A Helium White Dwarf of Extremely Low Mass
James Liebert, P. Bergeron, Daniel Eisenstein +4
We analyze the spectrum of an unusually-low mass white dwarf, SDSSJ123410.37-022802.9 (0335-264-52000), found in our recent, white dwarf catalog from the SDSS DR1 data release. Two…
Hubble Space Telescope Imaging of the WR 38/WR38a Cluster
Debra J. Wallace, Douglas R. Gies, Anthony F. J. Moffat +2
We are conducting a high angular resolution imaging survey of Galactic Wolf-Rayet stars using the Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope. We have found…
Nonthermal Radiation Processes in X-ray Jets
Charles D. Dermer, Armen Atoyan
Analytic approximations for synchrotron, synchrotron self-Compton (SSC), and external Compton (EC) processes are used to constrain model parameters for knot and hot-spot emission i…
Neutrinos and gamma-rays of hadronic origin from AGN jets
A. Atoyan, C. D. Dermer
We discuss the fluxes of high energy neutrinos and gamma-rays expected from AGNs if hadrons can be effectively accelerated to ultra-high energies by their relativistic jets, as cur…
Models for Solar Abundance Stars with Gravitational Settling and Radiative Accelerations: Application to M67 and NGC188
G. Michaud, O. Richard, J. Richer +1
Evolutionary models taking into account radiative accelerations, thermal diffusion, and gravitational settling for 28 elements, including all those contributing to OPAL stellar opa…