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17 papers · 2 filters
Multi-Wavelength Monitoring of GRS 1915+105
R. Bandyopadhyay, P. Martini, E. Gerard +5
Since its discovery in 1992, the superluminal X-ray transient GRS 1915+105 has been extensively observed in an attempt to understand its behaviour. We present here first results fr…
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…
Infrared Observations of Galaxy Clusters
David Elbaz
This short paper reviews some of the results obtained from ISO observations (ISOCAM and ISOPHOT) on galaxy clusters: Chap.1: "Intracluster dust": new evidence for the presence of d…
Tidal dwarf galaxies
Pierre-Alain Duc, Felix Mirabel
We review the observational evidences for tidal dwarf galaxies, a class of small galaxies formed out of the tidal debris of collisions between massive galaxies. Tidal dwarfs are fo…
The Multiplicity Function of Galaxies, Clusters and Voids
Patrick Valageas, Richard Schaeffer
We calculate the multiplicity function of matter condensations by directly considering the actual, deeply non-linear density field, which we compare to the popular Press-Schechter…
The IBIS view of the galactic centre: INTEGRAL's imager observations simulations
P. Goldoni, A. Goldwurm, P. Laurent +1
The Imager on Board Integral Satellite (IBIS) is the imaging instrument of the INTEGRAL satellite, the hard-X/soft-gamma ray ESA mission to be launched in 2001. It provides diagnos…
Properties Of The Hard X-ray Radiation From The Black Hole Candidates: Cygnus X-1 And 1E1740.7-2942
S. Kuznetsov, M. Gilfanov, E. Churazov +13
The entire dataset of the GRANAT/SIGMA observations of Cyg X-1 and 1E1740.7-2942 in 1990-1994 was analyzed in order to search for correlations between primary observational charact…
Galactic Black Hole Binaries: Multifrequency Connections
S. N. Zhang, I. F. Mirabel, B. A. Harmon +4
We review the recent multifrequency studies of galactic black hole binaries, aiming at revealing the underlying emission processes and physical properties in these systems. The opt…
Structure Detection in Low Intensity X-Ray Images
Jean-Luc Starck, Marguerite Pierre
In the context of assessing and characterizing structures in X-ray images, we compare different approaches. Most often the intensity level is very low and necessitates a special tr…
X-ray structures in galaxy cluster cores
Marguerite Pierre, Jean-Luc Starck
Using a set of ROSAT HRI deep pointings, we investigate the presence of small-scale structures in the central regions of clusters of galaxies. Our sample comprises 23 objects up to…
Radio Observations of the Black Hole Candidate GX 339-4
S. Corbel, R. P. Fender, P. Durouchoux +4
The black hole candidate GX 339-4 was first detected as a variable radio source by Sood & Campbell-Wilson in May 1994 with the Molonglo Observatory Synthesis Telescope (MOST). Sinc…
Scaling in Gravitational Clustering, 2D and 3D Dynamics
D. Munshi, F. Bernardeau, A. L. Melott +1
Perturbation Theory (PT) applied to a cosmological density field with Gaussian initial fluctuations suggests a specific hierarchy for the correlation functions when the variance is…
Self Similar Spherical Collapse Revisited: a Comparison between Gas and Dark Matter Dynamics
Romain Teyssier, Jean-Pierre CHIEZE, Jean-Michel Alimi
We reconsider the collapse of cosmic structures in an Einstein-de Sitter Universe, using the self similar initial conditions of Fillmore & Goldreich (1984). We first derive a new a…
Non-linear Dynamics and Mass Function of Cosmic Structures: I Analytical Results
Edouard Audit, Romain Teyssier, Jean-Michel Alimi
We investigate some modifications to the Press & Schechter (1974) (PS) prescription resulting from shear and tidal effects. These modifications rely on more realistic treatments of…
MACHOs, White Dwarfs, and the Age of the Universe
David S. Graff, Gregory Laughlin, Katherine Freese
(Abridged Abstract) A favored interpretation of recent microlensing measurements towards the Large Magellanic Cloud implies that a large fraction (i.e. 10--50%) of the mass of the…
Multiple CO Transitions, CI, and HCN from the Cloverleaf Quasar
Richard Barvainis, Philip Maloney, Robert Antonucci +1
New millimeter-wavelength emission lines are reported for the Cloverleaf (H1413+117), a gravitationally lensed quasar at redshift 2.56. High signal-to-noise ratio spectra of four l…
Time-dependent accretion and ejection implied by pre-stellar density profiles
R. Henriksen, P. Andre, S. Bontemps
Recent observations suggest that mass ejection and mass accretion both decline significantly with time during early protostellar evolution (Bontemps et al. 1996). In the present pa…