Search Publications
XMM-Newton observations of the dwarf elliptical galaxy NGC 3226
Gondoin, P.; Orr, A.; Siddiqui, H.
We report on an XMM-Newton observation of the dwarf elliptical galaxy NGC 3226 performed in November 2000. The analysis of the 0.4-10 keV spectrum of its nucleus is consistent with a power law continuum (Γ ≈ 1.96) absorbed at low energies by neutral gas (with a hydrogen column density NH ≈ 3-8× 1021 cm-2 and a cove…
A Gas+Dust Model of the Peculiar Envelope of HD 62623 Based on Interferometric Observations
Lopez, B.; Stee, Ph.; Bittar, J.
We present an improved model for the circumstellar environment of the peculiar star HD 62623 taking into account the gas around the central star and the dust present in the outer parts of the envelope. We compare our results with photometric observations and near-infrared interferometric observations obtained with aperture masking interferometry p…
Structure of interplanetary magnetic cloud on April 16, 1999 and its origin estimated by fitting the torus-shaped flux rope model
Ishibashi, Hiromitsu; Marubashi, Katsuhide
We examined the relationship between interplanetary magnetic cloud observed by the ACE satellite on April 16, 1999 and its solar origin. The solar and interplanetary background was relatively quiet for 10 clear days before April 16, enabling us to unambiguously assume the solar origin of the magnetic cloud. However, the results of fitting a consta…
A slow streamer blowout at the Sun and Ulysses
Bemporad, A.; Poletto, G.; Suess, S. T.
On 10 June 2000 a streamer on the southeast limb slowly disappeared from LASCO/C2 over ~10 hours. A small CME was reported in C2. A substantial interplanetary CME (ICME) was later detected at Ulysses, which was at quadrature with the Sun and SOHO at the time. This detection illustrates the properties of an ICME for a known solar source and demonst…
Hida Domeless Solar Telescope and SOHO Coronal Diagnostic Spectrometer Observations of Short-Duration Active Region Blinkers. II. Extreme-Ultraviolet Properties
Brooks, D. H.; Kurokawa, H.
X-Ray Luminous Galaxies. II. Chandra and XMM-Newton Observations of the ``Composite'' Galaxy IRAS 20051-1117
Zezas, A.; Georgantopoulos, I.; Papadakis, I. +1 more
We present Chandra and XMM-Newton observations of the composite star-forming/Seyfert galaxy IRAS 20051-1117. The X-ray imaging and spectral properties reveal the presence of an active nucleus. The Chandra image shows a strong nuclear point source [L(2-10keV)~4×1042ergss-1]. The nuclear X-ray source coincides with a bright, al…
Polarization of loop-top and footpoint sources in microwave bursts
Su, Y. N.; Huang, G. L.
The polarization is analyzed in four microwave bursts with one loop-top and two footpoint sources observed at 17 GHz with the Nobeyama Radioheliograph (NoRH). The loop-like structure of the four events is confirmed by simultaneous SOHO/MDI magnetograms and TRACE/EUV images or Yohkoh/SXT images. The heliocentric distance of the four events is great…
Erratum: ``Looking for Gravity-Mode Multiplets with the GOLF Experiment aboard SOHO'' (ApJ, 604, 455 [2004])
Kosovichev, A. G.; García, R. A.; Provost, J. +12 more
As a result of an error at the Press, the second panel of Figure 9 was repeated twice in the top row of the printed, black-and-white version of this figure, and the first panel was omitted. This error appears in the print edition and the PDF and postscript (PS) versions available with the electronic edition of the journal, although the panels of t…
A critical discussion on parametric and nonparametric regression methods applied to Hipparcos-FK5 residuals
Marco, F. J.; Martínez, M. J.; López, J. A.
In this paper we present an analysis of the differences between the Hipparcos and FK5 catalogues. We study parametric and nonparametric methods with two main objectives: first, to determine whether or not there is a pure rotation between the two catalogues, and to decide which model best represents the residuals; second, to give a practical formul…
Field-aligned current distribution in the transition current system
Belenkaya, Elena S.; Alexeev, Igor I.; Clauer, C. Robert
The interactions of coronal mass ejections with the Earth's magnetosphere are interesting because they often lead to extreme forcing of magnetospheric convection. Here we consider the initial interaction of a CME with the magnetosphere for the specific case in which there is a sharp increase in the dynamic pressure (interplanetary shock) that is a…