Science Archives Publication System

Multi-fluid simulations of Ganymede's magnetosphere

DOI: 10.1029/2004GL021220 Bibcode: 2004GeoRL..3124806P

Paty, Carol; Winglee, Robert

Comparative studies of 3D multi-fluid simulations with Galileo magnetometer data are used to develop a quantitative model of the currents and fields within Ganymede's magnetosphere as well as its bulk plasma environment. The model includes contributions from Jupiter's magnetosphere and the flux of different ion species originating from Ganymede's …

2004 • Geophysical Research Letters

eHST 45

An all-sky optical catalogue of radio/X-ray sources

DOI: 10.1051/0004-6361:20041076 Bibcode: 2004A&A...427..387F

Hardcastle, M. J.; Flesch, E.

We present an all-sky catalogue that aligns and overlays the ROSAT HRI, RASS, PSPC and WGA X-ray catalogues and the NVSS, FIRST and SUMSS radio catalogues onto the optical APM and USNO-A catalogues. Objects presented are those APM/USNO-A optical objects which are calculated with ≥ 40% confidence to be associated with radio/X-ray detections, or whi…

2004 • Astronomy and Astrophysics

XMM-Newton 45

X-ray spectroscopy on Abell 478 with XMM-Newton

DOI: 10.1051/0004-6361:20047170 Bibcode: 2004A&A...423...49D

Kaastra, J. S.; de Plaa, J.; Pointecouteau, E. +3 more

We report the results from a spatially resolved spectroscopy study with XMM-Newton on the relaxed cluster of galaxies Abell 478. From the EPIC data we extract a temperature profile and radial abundance profiles for Ne, Mg, Si, S, Ca, Fe and Ni. The abundance profiles follow the same trends as observed in other clusters. The spec…

2004 • Astronomy and Astrophysics

XMM-Newton 45

Hα variability of the recurrent nova T Coronae Borealis

DOI: 10.1051/0004-6361:20034623 Bibcode: 2004A&A...415..609S

Marziani, P.; Zamanov, R.; Stanishev, V. +1 more

We analyze Hα observations of the recurrent nova T CrB obtained during the last decade. For the first time the Hα emission profile is analyzed after subtraction of the red giant contribution. Based on our new radial velocity measurements of the Hα emission line we estimate the component masses of T CrB. It is …

2004 • Astronomy and Astrophysics

IUE 45

Three-dimensional Inversion of Time-Distance Helioseismology Data: Ray-Path and Fresnel-Zone Approximations

DOI: 10.1086/383342 Bibcode: 2004ApJ...607..554C

Kosovichev, A. G.; Birch, A. C.; Zhao, J. +1 more

Time-distance helioseismology has provided important new insight into the subphotospheric structure and dynamics of sunspots, active regions, supergranular cells, and large-scale flows. These inferences have been made by using either the ray-path or Fresnel-zone approximations. We present inversion results of travel-time perturbations of wavepacke…

2004 • The Astrophysical Journal

SOHO 45

Identification of emission lines in the low-ionization strontium filament near Eta Carinae

DOI: 10.1051/0004-6361:20035647 Bibcode: 2004A&A...419..215H

Smith, N.; Johansson, S.; Hartman, H. +2 more

We have obtained deep spectra from 1640 to 10 100 Å with the Space Telescope Imaging Spectrograph (STIS) of the strontium filament, a largely neutral emission nebulosity lying close to the very luminous star Eta Carinae and showing an uncommon spectrum. Over 600 emission lines, both permitted and forbidden, have been identified. The majority origi…

2004 • Astronomy and Astrophysics

eHST 45

Spectroscopic measurement of the plasma electron density and outflow velocity in a polar coronal hole

DOI: 10.1051/0004-6361:20031650 Bibcode: 2004A&A...416..749A

Giordano, S.; Antonucci, E.; Noci, G. +2 more

A new spectroscopic method, aimed to derive the plasma electron density and outflow velocity in expanding solar coronal regions, is discussed in this paper. The method is based on the analysis of a pair of coronal lines emitted via collisional and radiative excitation by the same ion, such as the O VI 1032, 1037 Å, doublet. The merit of this techn…

2004 • Astronomy and Astrophysics

SOHO 45

Effect of spatial resolution on estimating the Sun's magnetic flux

DOI: 10.1051/0004-6361:20040022 Bibcode: 2004A&A...417.1125K

Solanki, S. K.; Krivova, N. A.

A critical question related to a possible secular trend in the Sun's total magnetic flux and consequently in solar irradiance is the total amount of magnetic flux present on the Sun and how it is distributed between active regions and the quiet Sun. NSO/Kitt Peak synoptic charts have in the past been used to estimate the total flux and the fractio…

2004 • Astronomy and Astrophysics

SOHO 45

The Recent Cluster Formation Histories of NGC 5253 and NGC 3077: Environmental Impact on Star Formation

DOI: 10.1086/381669 Bibcode: 2004ApJ...603..503H

Conselice, Christopher J.; Calzetti, Daniela; Gallagher, John S., III +2 more

We present multicolor photometry of bright star cluster candidates in the nearby starburst galaxies NGC 3077 and NGC 5253, observed with the Hubble Space Telescope Wide Field Planetary Camera 2 in both broadband (F300W, F547M, and F814W) and narrowband (F487N and F656N) filters. By comparing the photometry with theoretical population synthesis mod…

2004 • The Astrophysical Journal

eHST 45

The nuclear ring in the unbarred galaxy NGC 278: Result of a minor merger?

DOI: 10.1051/0004-6361:20034336 Bibcode: 2004A&A...423..481K

Knapen, J. H.; van der Hulst, J. M.; de Blok, W. J. G. +1 more

We present fully sampled high angular resolution two-dimensional kinematics in the Hα spectral line, optical and near-infrared imaging, as well as 21 cm atomic hydrogen data of the spiral galaxy NGC 278. This is a small non-barred galaxy, which has a bright star forming inner region of about 2 kpc in diameter, reminiscent of nuclear rings seen mai…

2004 • Astronomy and Astrophysics

eHST 45