Search Publications
X-Ray Measurement of Dark Matter ``Temperature'' in A1795
Kitayama, Tetsu; Böhringer, Hans; Ikebe, Yasushi
We present a method from an X-ray observation of a galaxy cluster to measure the radial profile of the dark matter velocity dispersion, σDM, and to compare the dark matter ``temperature'' defined as µmpσ2DM/kB with the gas temperature. The method is applied to the XMM-Newton observation …
A high resolution spectroscopic study of the extraordinary planetary nebula LMC-N66
Hamann, W. -R.; Ruiz, M. T.; Peña, M. +2 more
The planetary nebula N66 in the Large Magellanic Cloud is an extraordinary object, as it is the only confirmed PN where the central star is a Wolf-Rayet star of the nitrogen sequence, i.e. of type [WN]. Moreover, the star showed a dramatic brightness outburst in 1993-1994. In a previous paper (Hamann et al. \cite{Hamann03}) we analyzed the changin…
Dust production and coma morphology of 67P/Churyumov-Gerasimenko during the 2002/2003 apparition. II. A comparative study of dust production in 46P/Wirtanen and 67P/Churyumov-Gerasimenko during their 2002/2003 apparition
Kidger, M. R.
A comparison is made of the light curves and and dust production of the initial target for the ROSETTA mission, 46P/Wirtanen and the new target 67P/Churyumov-Gerasimenko during their recent 2002/2003 apparition. The study is based on amateur CCD monitoring using a standardised method to produce consistent photometry in Johnson-Kron-Cousins system.…
Search for 1-10 Hz modulations in coronal emission with SECIS during the August 11, 1999 eclipse
Keenan, F. P.; Phillips, K. J. H.; Williams, D. R. +3 more
Results of the search of the periodic changes of the 530.3 nm line intensity emitted by selected structures of the solar corona in the frequency range 1-10 Hz are presented. A set of 12 728 images of the section of the solar corona extending from near the north pole to the south-west were taken simultaneously in the 530.3 nm (``green'') line and w…
Photochemical Concepts on the Origin of Biomolecular Asymmetry
Meierhenrich, Uwe J.; Thiemann, Wolfram H. -P.
Biopolymers like DNA and proteins are strongly selective towards the chirality of their monomer units. The use of homochiral monomers is regarded as essential for the construction and function of biopolymers; the emergence of the molecular asymmetry is therefore considered as a fundamental step in Chemical Evolution. This work focuses on physicoch…
Structure and Evolution of Starburst and Normal Galaxies
Grogin, Norman A.; Lucas, Ray A.; de Mello, Duilia +5 more
A comparative study of the rest-frame morphology and structural properties of optically selected starburst galaxies at redshift z<~1 is carried out using multi-wave-band (BViz) high-resolution images taken by the Advanced Camera for Surveys as part of the Great Observatories Origins Deep Survey. We classify galaxies into starburst, early, and l…
Fast solar wind after the rapid acceleration
Breen, A. R.; Tokumaru, M.; Hayashi, K. +3 more
We have studied the radial dependence of the velocity of high-latitude fast solar wind in the heliocentric distance range of 0.13-0.9 AU. For this study a new tomographic analysis method which can evaluate uncertainties was developed to obtain velocity distribution maps on two reference spheres at 0.13 and 0.3 AU using interplanetary scintillation…
Cluster observations of velocity space-restricted ion distributions near the plasma sheet
Lundin, R.; Sauvaud, J. -A.; Dandouras, I. +15 more
We present Cluster ion observations obtained at 18 RE in the magnetotail on 1 October 2001. According to a recent analysis, the quartet encountered a reconnection region and a tailward-moving neutral line. We examine in detail selected 3-D ion distributions, which through much of the hour following 0925 UT were non-gyrotropic. B-perpend…
XMM-Newton observations of two X-ray-bright galaxy groups - pushing out to r500
Ponman, T. J.; Rasmussen, J.
We report on the results of XMM-Newton observations of the z= 0.18 galaxy group WARPJ0943.7+1644 and the nearby poor cluster WARPJ0943.5+1640 at z= 0.256. Tracing the X-ray gas out to ~425 and ~500 h-1 kpc in the two systems, corresponding to roughly 70 per cent of the estimated virial radii, we find the surface-brightness profile of bo…
Prominence atlas in the SUMER range 800 1250 Å: I. Observations, data reduction and preliminary results
Vial, J. -C.; Parenti, S.; Lemaire, P.
The aim of this work is to build an EUV-UV spectral catalogue of a prominence. Here we focus on the preparatory work for the final result and we give an example of the results obtained. As a first step, we present the information needed for a full understanding of the results that will form the final entire catalogue. The data are composed of a fu…