Science Archives Publication System

Tidal dwarfs in the M81 group: the second generation?

DOI: 10.1023/A:1024670028046 Bibcode: 2003Ap&SS.285..107M

Sarajedini, A.; Geisler, D.; Guhathakurta, P. +8 more

We present a quantitative star formation history derivation of the four suspected tidal dwarf galaxies in the M 81 group: Holmberg IX, BK3N,Arp-loop (A0952+69) and Garland using HST/WFPC2 images of these galaxies. We construct a library of synthetic Colour-Magnitude Diagrams(CMDs) based on theoretical isochrones and data-derived determinations of …

2003 • Astrophysics and Space Science

eHST 3

The downward X-ray spectrum of PKS 2155-304 in the inner jet description

DOI: 10.1016/S1387-6473(03)00128-3 Bibcode: 2003NewAR..47..709C

Ciprini, Stefano

The compact radio source PKS 2155-304 ( z=0.116) is a gamma-ray blazar and one of the brightest in UV and X-ray bands, repeatedly monitored at X-ray frequencies in the past years, and observed recently by Chandra and XMM-Newton. Various intensity states and a continuously downward-curved trend with the energy is displayed clearly, summarizing some…

2003 • New Astronomy Reviews

XMM-Newton 3

Solitary Waves Observed By Cluster In the Solar Wind

DOI: 10.1063/1.1618659 Bibcode: 2003AIPC..679..562F

Fränz, M.; Dandouras, I.; Génot, V. +6 more

Short dropouts of the magnetic field intensity have been frequently observed in the solar wind on interplanetary spacecraft. But so far it could not be established whether these are caused by kinetic instabilities or whether they can be described as solitary MHD waves. The multi-satellite observations of the Cluster-mission allow for the first tim…

2003 • Solar Wind Ten

Cluster 3

Magnetic cloud and magnetosphere — Ionosphere response to the 6 November 1997 CME

DOI: 10.1016/S0273-1177(03)90636-3 Bibcode: 2003AdSpR..32.1981B

Bochev, A. Z.; -Dimitrova, I. I. A.

In the present work we analyse the magnetic cloud (MC) at 1 AU on 9 November 1997. The appearance of a hotter and dense part (dense filament), with radial extent 10 ⁶ km, immediately behind the frontal part of the MC, is a distinctive feature of the event. The INTERBALL - Aurora] Probe had a chance to observe field-aligned currents in t…

2003 • Advances in Space Research

SOHO 3

Azimuthal and Kinematic Segregation of Neutral and Molecular Gas in Arp 118: The Yin-Yang Galaxy NGC 1144

DOI: 10.1086/367635 Bibcode: 2003ApJ...586..112A

Appleton, P. N.; Charmandaris, V.; Gao, Yu +2 more

We present new high-resolution H I observations of the disk of the collisional infrared luminous (L_IR=2.2×10¹¹L_solar) galaxy NGC 1144, which reveal an apparent large-scale azimuthal and kinematic segregation of neutral hydrogen relative to the molecular gas distribution. Even among violently collisional galaxies, t…

2003 • The Astrophysical Journal

eHST 3

The extended structure of the Phoenix dwarf galaxy

DOI: 10.1023/A:1024010106912 Bibcode: 2003Ap&SS.284..595H

Aparicio, Antonio; Hidalgo, Sebastian L.; MartÍnez-Delgado, David

The surface brightness profile in the V band of the Phoenix dwarf galaxy shows two stellar components: an inner one, which contains all the young stars of the galaxy, and an outer one predominantly populated by red stars. Deep color-magnitude diagrams (CMDs), based on Hubble Space Telescope (HST) observations and reaching the oldest turn-offs, are…

2003 • Astrophysics and Space Science

eHST 3

On a New Technique for Discovering Variable Stars

DOI: 10.1515/astro-2017-0086 Bibcode: 2003BaltA..12..589M

Mironov, A. V.; Zakharov, A. I.; Nikolaev, F. N.

A technique for discovering variable stars based on the calculation of the correlation coefficients is proposed. Applications of the technique are shown on the results of numerical experiments and on the Hipparcos photometric data.

2003 • Baltic Astronomy

Hipparcos 3

Transition to solar minimum at high solar latitudes: Energetic particles from corotating interaction regions

DOI: 10.1029/2003GL017138 Bibcode: 2003GeoRL..30.8034H

Forsyth, R. J.; Sanderson, T. R.; Marsden, R. G. +2 more

One of the key questions to be addressed during the solar maximum phase of the Ulysses mission has been the nature of the ubiquitous energetic particle populations observed at all helio-latitudes from equator to poles. During the current, post-maximum phase of its mission, Ulysses has encountered the return to more stable solar wind, high speed st…

2003 • Geophysical Research Letters

Ulysses 3

Propagation of CMEs in the interplanetary medium: Numerical and analytical results

DOI: 10.1016/S0273-1177(03)00334-X Bibcode: 2003AdSpR..32..513G

Raga, A. C.; Lara, A.; Cantó, J. +2 more

We study the propagation of coronal mass ejections (CMES) from near the Sun to 1 AU by comparing results from two different models: a 1-D, hydrodynamic, single-fluid, numerical model (González-Esparza et al., 2003a) and an analytical model to study the dynamical evolution of supersonic velocity's fluctuations at the base of the solar wind applied …

2003 • Advances in Space Research

SOHO 3

First observations of the X-ray transient EXO 2030+375 with IBIS/ISGRI

DOI: 10.1051/0004-6361:20031354 Bibcode: 2003A&A...411L.437K

Goldoni, P.; Falanga, M.; Goldwurm, A. +3 more

We present a first INTEGRAL observation of the 42 s transient X-ray pulsar EXO 2030+375 with IBIS/ISGRI. The source was detected during Cyg X-1 observations in December 2002. We analyzed observations during the outburst period from 9 to 21 December 2002 with a total exposure time of ~ 770 kilosec. EXO 2030+375 was almost always detected during sin…

2003 • Astronomy and Astrophysics

INTEGRAL 3