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XMM-Newton Observation of the Cluster of Galaxies Abell 1650
Yamashita, Koujun; Takahashi, Seiji
We present the nonuniform distribution of temperature and abundance in the angular extent of 10' (1.4Mpc) in A1650 observed by XMM-Newton. Spectral analysis was carried out in 19 systematically-subdivided regions, and in 15 specified regions referred to the hardness ratio (HR) map. The value of HR, defined as the ratio of counts in the 1.6-10keV b…
Latitudinal and radial variation of >2 GeV/n protons and alpha-particles at solar maximum: Ulysses COSPIN/KET and neutron monitor network observations
Kunow, H.; Heber, B.; Müller-Mellin, R. +4 more
Ulysses, launched in October 1990, began its second out-of-ecliptic orbit in September 1997. In 2000/2001 the spacecraft passed from the south to the north polar regions of the Sun in the inner heliosphere. In contrast to the first rapid pole to pole passage in 1994/1995 close to solar minimum, Ulysses experiences now solar maximum conditions. The…
Filament eruption without coronal mass ejection
Moore, Ronald L.; Choudhary, Debi Prasad
We report characteristics of quiescent filament eruptions that were not associated with coronal mass ejections (CMEs). We examined 12 quiescent filament eruptions, each of which was located far from disk center (>=0.7 RSun) in diffuse remnant magnetic fields of decayed active regions, was well observed in full-disk movies in Hα and F…
Deep XMM survey of M33
Pietsch, W.; Haberl, F.; Ehle, M. +2 more
In an XMM raster observation of the bright local group spiral galaxy M33 we study the population of X-ray sources (X-ray binaries, supernova remnants, super-shells) down to a 0.5-10 keV luminosity of \oergs{35} - more than a factor of 10 deeper than earlier ROSAT observations. EPIC spectra and hardness ratios are used to distinguish between differ…
Toward a self-consistent treatment of the cyclotron wave heating and acceleration of the solar wind plasma
Laitinen, T.; Fichtner, H.; Vainio, R.
We have developed a steady state two-fluid description of the radial solar wind expansion close to the coronal base. The model is formulated self-consistently with respect to the radial evolution of turbulence by supplementing the moment equations of the plasma with an equation describing the radial evolution of the Alfvén wave power as originally…
Far-Ultraviolet Observations of the Circumstellar Gas in the 2 Andromedae System
Neff, James E.; Cheng, K. -P.
The A5 star β Pictoris is a possible young planetary system and has the best-studied circumstellar disk. Our visible and ultraviolet observations of 2 Andromedae indicated that this A3 star has β Pictoris-like gas infall. We present the far-ultraviolet spectrum (905-1195 Å) of 2 And we obtained with the NASA-CNES-CSA Far Ultraviolet Spectroscopic …
Magnetic clouds with east/west orientated axes observed by Ulysses during solar cycle 23
Forsyth, R. J.; Rees, A.
The second Ulysses orbit of the Sun has provided a unique opportunity for the study of the interplanetary manifestation of coronal mass ejections (ICMEs) over a wide range of heliographic latitudes. The Ulysses dataset between July 1995 and mid April 2003 has been surveyed for magnetic clouds (MCs), a subset of ICMEs. As a result of the rising sol…
Abundances of the planetary nebula Hu 1-2
Pottasch, S. R.; Beintema, D. A.; Feibelman, W. A. +4 more
The ISO and IUE spectra of the ``elliptical'' nebula
An extension of Herschel's method for dense and extensive catalogues. Application to the determination of solar motion
Bongiovanni, A.; Vieira, K.; Abad, C. +2 more
We present a way of handling and interpreting stellar proper motions, in which the idea of substituting them by great circles, proposed by Herschel in 1783, allows us to take the entire celestial sphere as a field of application, making possible the study of dense and extensive stellar zones. A suitable mathematical processing of data together wit…
Castor A and Castor B resolved in a simultaneous Chandra and XMM-Newton observation
Burwitz, V.; Stelzer, B.
We present a simultaneous Chandra and XMM-Newton observation of the Castor sextett, focusing on Castor A and Castor B, two spectroscopic binaries with early-type primaries. Our study represents the first unambiguous X-ray detection of all three visual components in the Castor sextett making use of the unprecedented spatial resolution of Chandra. O…