Science Archives Publication System

MHD simulation of the formation and propagation of multiple magnetic clouds in the heliosphere

DOI: 10.1051/0004-6361:20041423 Bibcode: 2005A&A...434..309W

Wang, S.; Wang, Y.; Zheng, H. +1 more

A multiple-magnetic-cloud (Multi-MC) structure formed by the overtaking of two successive coronal mass ejections (CMEs) in the heliosphere is studied by using a 2.5-D MHD simulation. This simulation illustrates the process of the formation and propagation of two identical CMEs, which are ejected with speeds of 400 km s^-1 and 600 km s

2005 • Astronomy and Astrophysics

SOHO 40

Possible AGN Shock Heating in the Cool-Core Galaxy Cluster Abell 478

DOI: 10.1086/431750 Bibcode: 2005ApJ...630..191S

Finoguenov, Alexis; Mohr, Joseph J.; Sanderson, Alastair J. R.

We present a detailed X-ray study of the intracluster medium (ICM) of the nearby cool-core galaxy cluster Abell 478 (z=0.088), based on Chandra and XMM-Newton observations. Using a wavelet-smoothing hardness analysis, we derive detailed temperature maps of A478, revealing a surprising amount of temperature structure for an apparently well-relaxed …

2005 • The Astrophysical Journal

XMM-Newton 40

Dawn-dusk asymmetries and sub-Alfvénic flow in the high and low latitude magnetosheath

DOI: 10.5194/angeo-23-3351-2005 Bibcode: 2005AnGeo..23.3351L

Dandouras, I.; Fazakerley, A. N.; Lucek, E. A. +4 more

We present the results of a statistical survey of the magnetosheath using four years of Cluster orbital coverage. Moments of the plasma distribution obtained from the electron and ion instruments together with magnetic field data are used to characterise the flow and density in the magnetosheath. We note two important differences between our surve…

2005 • Annales Geophysicae

Cluster 40

The distance to the Pleiades. Main sequence fitting in the near infrared

DOI: 10.1051/0004-6361:20041694 Bibcode: 2005A&A...429..887P

Salaris, M.; Groenewegen, M. A. T.; Percival, S. M.

Hipparcos parallax measurements of stars in the Pleiades notoriously result in a cluster distance of 118 pc, which is approximately 10% shorter than the ``classical'' result obtained from earlier main sequence (MS) fitting studies. In an earlier paper we developed a purely empirical MS-fitting method in an attempt to address this problem. This wor…

2005 • Astronomy and Astrophysics

Hipparcos 40

Introduction to the special section: Violent Sun-Earth connection events of October-November 2003

DOI: 10.1029/2005GL022348 Bibcode: 2005GeoRL..32.3S01G

Plunkett, S. P.; Lu, G.; Gopalswamy, N. +2 more

During 2003 October and November, a series of solar eruptions occurred from three solar active regions. Some of these eruptions were extreme in terms of their origin (source properties) and heliospheric consequences. This paper summarizes the first results of the analysis of these violent Sun-Earth connection events.

2005 • Geophysical Research Letters

SOHO 40

An Unusual Spectral State of an Ultraluminous Very Soft X-Ray Source during Outburst

DOI: 10.1086/498020 Bibcode: 2005ApJ...632L.107K

Kong, A. K. H.; Di Stefano, R.

We report the results of Chandra and XMM-Newton observations of a new outburst of an ultraluminous X-ray source in M101. During a Chandra monitoring observation of M101, M101 ULX-1 was found to be in outburst in 2004 December, the second outburst in 2004. The peak bolometric luminosity is about 3×10⁴⁰ ergs s^-1 (7×10³⁹

2005 • The Astrophysical Journal

XMM-Newton 40

A Refined Ephemeris and Phase-resolved X-Ray Spectroscopy of the Geminga Pulsar

DOI: 10.1086/491615 Bibcode: 2005ApJ...633.1114J

Jackson, M. S.; Halpern, J. P.

We present a refined, phase-connected, postglitch ephemeris for the Geminga pulsar that is a good fit to all the postglitch data from EGRET, ASCA, and XMM-Newton. We also present the results of phase-resolved spectroscopy of two XMM-Newton X-ray observations of the Geminga pulsar obtained in 2002 and 2004. An investigation is made into a previousl…

2005 • The Astrophysical Journal

XMM-Newton 40

The massive binary CPD - 41° 7742. II. Optical light curve and X-ray observations

DOI: 10.1051/0004-6361:20052746 Bibcode: 2005A&A...441..213S

Gosset, E.; Rauw, G.; Vreux, J. -M. +4 more

In the first paper of this series, we presented a detailed high-resolution spectroscopic study of CPD - 41° 7742, deriving for the first time an orbital solution for both components of the system. In this second paper, we focus on the analysis of the optical light curve and on recent XMM-Newton X-ray observations. In the optical…

2005 • Astronomy and Astrophysics

XMM-Newton 40

Discovery of X-Ray Emission from Supernova 1970G with Chandra: Filling the Void between Supernovae and Supernova Remnants

DOI: 10.1086/497910 Bibcode: 2005ApJ...632L..99I

Kuntz, K. D.; Immler, Stefan

We report the discovery of X-ray emission from SN 1970G in M101, 35 yr after its outburst, using deep X-ray imaging with the Chandra X-Ray Observatory. The Chandra ACIS spectrum shows that the emission is soft (<~2 keV) and characteristic of the reverse-shock region. The X-ray luminosity, L_0.3-2=(1.1+/-0.2)×10³⁷ ergs s

2005 • The Astrophysical Journal

XMM-Newton 40

The Multitude of Molecular Hydrogen Knots in the Helix Nebula

DOI: 10.1086/444539 Bibcode: 2005AJ....130.1784M

McCullough, Peter; Meixner, Margaret; Speck, Angela +2 more

We present Hubble Space Telescope NICMOS imaging of the H₂ 2.12 µm emission in five fields in the Helix Nebula ranging in radial distance from 250" to 450" from the central star. The images reveal arcuate structures with their apexes pointing toward the central star. These molecular hydrogen knots are most highly structured in the…

2005 • The Astronomical Journal

eHST 40