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19912026
Showing 2002 · astro-phShow all

70 papers · 2 filters

astro-ph2002

High Energy Emission from Galactic Black Hole Systems

A. Goldwurm

In the last decade our knowledge on galactic black hole systems and in particular on their high energy behavior has considerably improved. I will briefly review here the main resul…

astro-ph2002★ 16 cited

Submillimeter Studies of Prestellar Cores and Protostars: Probing the Initial Conditions for Protostellar Collapse

Philippe Andre, Jeroen Bouwman, Arnaud Belloche +1

Improving our understanding of the initial conditions and earliest stages of protostellar collapse is crucial to gain insight into the origin of stellar masses, multiple systems, a…

astro-ph2002

The XMM-Newton view of the Galactic Centre

Masaaki Sakano, Robert S. Warwick, Anne Decourchelle

In X-rays, the Galactic Centre (GC) Region appears as a complex of diffuse thermal and non-thermal X-ray emission intermixed with a population of luminous discrete sources. Here we…

astro-ph2002

The Nature of the Low-Metallicity ISM in the Dwarf Galaxy NGC 1569

F. Galliano, S. C. Madden, A. P. Jones +3

We are modeling the spectra of dwarf galaxies from infrared to submillimeter wavelengths to understand the nature of the various dust components in low-metallicity environments, wh…

astro-ph2002★ 29 cited

The cosmological constant and general isocurvature initial conditions

R. Trotta, A. Riazuelo, R. Durrer

We investigate in detail the question whether a non-vanishing cosmological constant is required by present-day cosmic microwave background and large scale structure data when gener…

astro-ph2002★ 73 cited

ISOCAM view of the starburst galaxies M82, NGC253, and NGC1808

N. M. Foerster Schreiber, M. Sauvage, V. Charmandaris +4

We present results of mid-infrared 5.0-16.5 micron spectrophotometric imaging of the starburst galaxies M82, NGC253, and NGC1808 from the ISOCAM instrument on board the Infrared Sp…

astro-ph2002★ 27 cited

Cosmological parameters estimation in the Quintessence Paradigm

M. Douspis, A. Riazuelo, Y. Zolnierowski +1

We present cosmological parameter constraints on flat cosmologies dominated by dark energy using various cosmological data including the recent Archeops angular power spectrum meas…

astro-ph2002★ 36 cited

On the Spiral Structure of NGC 2915 and Dark Matter

F. S. Masset, M. Bureau

NGC 2915 is a blue compact dwarf galaxy embedded in an extended, low surface brightness HI disk exhibiting a two-armed spiral structure and a central bar-like component. Commonly a…

astro-ph2002★ 56 cited

Simulating Cosmic Microwave Background maps in multi-connected spaces

Alain Riazuelo, Jean-Philippe Uzan, Roland Lehoucq +1

This article describes the computation of cosmic microwave background anisotropies in a universe with multi-connected spatial sections and focuses on the implementation of the topo…

astro-ph2002★ 44 cited

Ground-based near-infrared imaging of the HD141569 circumstellar disk

A. Boccaletti, J. C. Augereau, F. Marchis +1

We present the first ground-based near-infrared image of the circumstellar disk around the post-Herbig Ae/Be star HD141569A initially detected with the HST. Observations were carri…

astro-ph2002★ 44 cited

Spatial study with the VLT of a new resolved edge-on circumstellar dust disk discovered at the periphery of the rho Ophiuchi dark cloud

N. Grosso, J. Alves, K. Wood +3

We report the discovery in NIR with SofI at the NTT of a resolved circumstellar dust disk around a 2MASS source at the periphery of the rho Ophiuchi dark cloud. We present follow-u…

astro-ph2002★ 37 cited

The discovery of a new non-thermal X-ray filament near the Galactic Centre

Masaaki Sakano, Robert S. Warwick, Anne Decourchelle +1

We report the discovery by XMM-Newton and Chandra of a hard extended X-ray source (XMM J174540-2904.5) associated with a compact non-thermal radio filament (the Sgr A-E `wisp'=1LC…

astro-ph2002★ 85 cited

The runaway black hole GRO J1655-40

I. F. Mirabel, R. Mignani, I. Rodrigues +3

We have used the Hubble Space Telescope to measure the motion in the sky and compute the galactocentric orbit of the black hole X-ray binary GRO J1655-40. The system moves with a r…

astro-ph2002★ 21 cited

The detection of diffuse emission in HCG 16 with XMM-Newton

E. Belsole, L. Sauvageot, T. J. Ponman +1

We report results obtained from analysis of the XMM-Newton observation of the compact group of galaxies HCG 16. It is a peculiar system composed of 7 spirals, 6 of which are active…

astro-ph2002★ 37 cited

Polarization Evolution of the GRB 020405 Afterglow

S. Covino, D. Malesani, G. Ghisellini +16

Polarization measurements for the optical counterpart to GRB 020405 are presented and discussed. Our observations were performed with the VLT-UT3 (Melipal) during the second and th…

astro-ph2002★ 2 cited

Quintessence and the accelerating universe

Philippe Brax, Jerome Martin

Observations seem to indicate that our universe is presently accelerating due to the presence of dark energy. Quintessence represents a possible way to model the dark energy. In th…

astro-ph2002★ 243 cited

Exploring the Role of Jets in the Radio/X-ray Correlations of GX339-4

S. Markoff, M. Nowak, S. Corbel +2

The Galactic black hole candidate X-ray binary GX339-4 spends most of its time in the low/hard state, making it an ideal candidate for modeling the assumedly low accretion phase. T…

astro-ph2002★ 3 cited

SIMBOL-X, an X-ray telescope for the 0.5-70 keV range

Philippe Ferrando

SIMBOL-X is a high energy "mini" satellite class mission that is proposed by a European collaboration for a launch in 2009. SIMBOL-X is making use of a classical X-ray mirror, of ~…

astro-ph2002★ 5 cited

Classical, non-linear, internal dynamics of large, isolated, vibrationally excited molecules

R. Papoular

This work reports numerical experiments intended to clarify the internal equilibration process in large molecules, following vibrational excitation. A model of amorphous and oxygen…

astro-ph2002★ 203 cited

Cosmological constraints from Archeops

A. Benoit, P. Ade, A. Amblard +65

We analyze the cosmological constraints that Archeops places on adiabatic cold dark matter models with passive power-law initial fluctuations. Because its angular power spectrum ha…

astro-ph2002★ 189 cited

The Cosmic Microwave Background Anisotropy Power Spectrum measured by Archeops

A. Benoit, P. Ade, A. Amblard +65

We present a determination by the Archeops experiment of the angular power spectrum of the cosmic microwave background anisotropy in 16 bins over the multipole range l=15-350. Arch…

astro-ph2002★ 4 cited

Arrows of Time and Chaotic Properties of the Cosmic Background Radiation

A. E. Allahverdyan, V. G. Gurzadyan

We advance a new viewpoint on the connection between the the thermodynamical and cosmological arrows of time, which can be traced via the properties of Cosmic Microwave Background…

astro-ph2002

Molecular gas in the intergalactic medium of Stephan's Quintet

Ute Lisenfeld, Stephane Leon, Jonathan Braine +3

Stephan's Quintet (SQ) is a Hickson Compact Group well known for its complex dynamical and star formation history and its rich intergalactic medium (IGM). In order to study the ext…

astro-ph2002★ 8 cited

Rapid variability of accretion in AM Herculis

D. de Martino, G. Matt, B. T. Gaensicke +3

We present the last pointed observation of AM Her carried out during the life of the BeppoSAX satellite. It was bright at the beginning of the observation, but dropped to the lowes…