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19922026
Showing 2002 · astro-phShow all

41 papers · 2 filters

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★ 11 cited

Ho Measurement from VLT Deep I-band Surface Brightness Fluctuations in NGC 564 and NGC 7619

S. Mei, M. Scodeggio, D. R. Silva +1

We have measured the Hubble constant Ho in NGC 564 at cz ~ 5800 km/s and in NGC 7619 at cz ~ 3700 km/s with deep I-band Surface Brightness Fluctuation distance measurements at the…

astro-ph2002★ 37 cited

Cosmological Magnetogenesis driven by Radiation Pressure

Mathieu Langer, Jean-Loup Puget, Nabila Aghanim

The origin of large scale cosmological magnetic fields remains a mystery, despite the continuous efforts devoted to that problem. We present a new model of magnetic field generatio…

astro-ph2002★ 28 cited

A simplified numerical model of coronal energy dissipation based on reduced MHD

E. Buchlin, V. Aletti, S. Galtier +3

A 3D model intermediate between cellular automata (CA) models and the reduced magnetohydrodynamic (RMHD) equations is presented to simulate solar impulsive events generated along a…

astro-ph2002★ 15 cited

Extraction of cluster parameters with future Sunyaev-Zel'dovich observations

Nabila Aghanim, Steen H. Hansen, Sergio Pastor +1

The Sunyaev-Zel'dovich (SZ) effect of galaxy clusters is characterized by three parameters: Compton parameter, electron temperature and cluster peculiar velocity. In the present st…

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★ 115 cited

A 1.2mm MAMBO/IRAM-30m Study of Dust Emission from optically luminous z~2 Quasars

A. Omont, A. Beelen, F. Bertoldi +5

We report 250GHz (1.2mm) observations of redshift 1.8 < z < 2.8 optically luminous (M_B < -27.0), radio quiet quasars using the Max-Planck Millimeter Bolometer (MAMBO) array at the…

astro-ph2002★ 25 cited

Results of the ESO-SEST Key Programme on CO in the Magellanic Clouds. IX. The giant LMC HII region complex N11

F. P. Israel, Th. de Graauw, L. E. B. Johansson +7

We present maps and a catalogue containing the J=1-0 12CO parameters of 29 individual molecular clouds in the second-brightest LMC star formation complex, N11. In the southwestern…

astro-ph2002★ 100 cited

Predictions for Cosmological Infrared Surveys from Space with the Multiband Imaging Photometer for SIRTF (MIPS)

H. Dole, G. Lagache, J. -L. Puget +1

We make predictions for the cosmological surveys to be conducted by MIPS/SIRTF at 24, 70 and 160 microns, for the GTO and the legacy programs, using the latest knowledge of the ins…

astro-ph2002★ 35 cited

Bias and the power spectrum beyond the turn-over

Ruth Durrer, Andrea Gabrielli, Michael Joyce +1

Threshold biasing of a Gaussian random field gives a linear amplification of the reduced two point correlation function at large distances. We show that for standard cosmological m…

astro-ph2002★ 17 cited

Study of a Strategy for Parallax Microlensing Detection Towards the Magellanic Clouds

S. Rahvar, M. Moniez, R. Ansari +1

In this article, we have investigated the possibility to distinguish between different galactic models through the microlensing parallax studies. We show that a systematic search f…

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★ 56 cited

Generation of Primordial Cosmological Perturbations from Statistical Mechanical Models

A. Gabrielli, B. Jancovici, M. Joyce +3

The initial conditions describing seed fluctuations for the formation of structure in standard cosmological models, i.e.the Harrison-Zeldovich distribution, have very characteristi…

astro-ph2002★ 30 cited

Collision-induced galaxy formation: semi-analytical model and multi-wavelength predictions

Christophe Balland, Julien E. G. Devriendt, Joe Silk

A semi-analytic model is proposed that couples the Press-Schechter formalism for the number of galaxies with a prescription for galaxy-galaxy interactions that enables to follow th…

astro-ph2002★ 40 cited

Detection of abundant solid CO in the disk around CRBR 2422.8-3423

W. F. Thi, K. M. Pontoppidan, E. F. van Dishoeck +2

We present direct evidence for CO freeze-out in a circumstellar disk around the edge-on class I object CRBR 2422.8-3423, observed in the M band with VLT-ISAAC at a resolving power…

astro-ph2002★ 42 cited

Detecting Topology in a Nearly Flat Spherical Universe

Jeffrey Weeks, Roland Lehoucq, Jean-Philippe Uzan

When the density parameter is close to unity, the universe has a large curvature radius independently of its being hyperbolic, flat, or spherical. Whatever the curvature, the unive…

astro-ph2002★ 160 cited

Inflationary models inducing non-Gaussian metric fluctuations

Francis Bernardeau, Jean-Philippe Uzan

We construct explicit models of multi-field inflation in which the primordial metric fluctuations do not necessarily obey Gaussian statistics. These models are realizations of mech…

astro-ph2002★ 28 cited

Data analysis methods for XMM-Newton observations of extended sources. Application to bright massive clusters of galaxies at z=0.2

Philippe B. Marty, Jean-Paul Kneib, Rachida Sadat +2

In this paper, a review is given of methods useful for XMM-Newton EPIC data analysis of extended sources, along with some applications to a bright massive cluster of galaxies at z=…

astro-ph2002★ 42 cited

ISO-LWS observations of C+ and O lines in absorption toward SgrB2

Charlotte Vastel, Edward Polehampton, Jean-Paul Baluteau +3

High spectral resolution ISO-LWS observations of the [OI] 63.2 and 145.5 microns and [CII] 157.7 microns fine structure lines are presented for the center of the Sagittarius B2 com…

astro-ph2002★ 91 cited

Power spectrum of the cosmic infrared background at 60 and 100 microns with IRAS

M. -A. Miville-Deschenes, G. Lagache, J. -L. Puget

Based on a power spectrum analysis of the IRAS ISSA maps, we present the first detection of the Cosmic far-Infrared Background (CIB) fluctuations at 60 and 100 microns. The power s…

astro-ph2002★ 24 cited

EROS 2 proper motion survey: Constraints on the halo white dwarfs

B. Goldman, C. Afonso, Ch. Alard +9

We are conducting a 377-square-degree proper motion survey in the ~V and I bands in order to determine the cool white dwarf contribution to the Galactic dark matter. Using the 250…

astro-ph2002★ 62 cited

High Resolution CO and H2 Molecular Line Imaging of a Cometary Globule in the Helix Nebula

P. J. Huggins, T. Forveille, R. Bachiller +3

We report high resolution imaging of a prominent cometary globule in the Helix nebula in the CO J=1-0 (2.6 mm) and H2 v=1-0 S(1) (2.12 micron) lines. The observations confirm that…

astro-ph2002★ 145 cited

H2 formation and excitation in the diffuse interstellar medium

Cecile Gry, Francois Boulanger, Cyrine Nehme +3

We use far-UV absorption spectra obtained with FUSE towards three late B stars to study the formation and excitation of H2 in the diffuse ISM. The data interpretation relies on a m…

astro-ph2002★ 1 cited

Optimization of the Coupling of High-Frequency Horn Antenna Array to the ESA PLANCK Submillimeter-Wave Telescope

Vladimir Yurchenko, John Anthony Murphy, Jean-Michel Lamarre

We study the electromagnetic coupling of the array of Gaussian and multi-moded horn antennas to the dual-reflector submillimeter-wave telescope on the ESA PLANCK Surveyor designed…