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On the evolutionary status of early-type galaxies in clusters at z~ 0.2 - I. The Fundamental Plane
Smail, Ian; Davies, Roger L.; Bower, Richard G. +2 more
We investigate a spectroscopic sample of 48 early-type galaxies in the rich cluster Abell 2390 at z= 0.23 and 48 early-type galaxies from a previously published survey of Abell 2218 at z= 0.18. The spectroscopic data of A2390 are based on multi-object spectroscopy using the multi-object spectrograph for Calar Alto at the 3.5-m telescope on Calar A…
On the origin of microwave zebra pattern
Kuznetsov, A. A.; Yan, Yihua; Altyntsev, A. T. +2 more
The results of the first observations of a zebra pattern at frequencies around5.6GHz are presented. The fine structures in the emission spectrum were recorded simultaneously by the Siberian Solar Radiotelescope and the spectropolarimeters of the National Astronomical Observatories, which allowed us to study the presented event with high spatial, t…
Solar control on Jupiter's equatorial X-ray emissions: 26-29 November 2003 XMM-Newton observation
Branduardi-Raymont, G.; Soria, R.; Waite, J. H. +6 more
During Nov. 26-29, 2003 XMM-Newton observed soft (0.2-2 keV) X-ray emission from Jupiter for 69 hours. The low-latitude X-ray disk emission of Jupiter is observed to be almost uniform in intensity with brightness that is consistent with a solar-photon driven process. The simultaneous light curves of Jovian equatorial X rays and solar X rays (measu…
Cassini Discovers a Kinematic Spiral Ring Around Saturn
Charnoz, S.; Porco, C. C.; Déau, E. +4 more
Since the time of the Voyager flybys of Saturn in 1980-1981, Saturn's eccentric F ring has been known to be accompanied on either side by faint strands of material. New Cassini observations show that these strands, initially interpreted as concentric ring segments, are in fact connected and form a single one-arm trailing spiral winding at least th…
Characteristic Times of Gradual Solar Energetic Particle Events and Their Dependence on Associated Coronal Mass Ejection Properties
Kahler, S. W.
We use 20 MeV proton intensities from the EPACT instrument on Wind and coronal mass ejections (CMEs) from the LASCO coronagraph on SOHO observed during 1998-2002 to statistically determine three characteristic times of gradual solar energetic particle (SEP) events as functions of solar source longitude: (1) TO, the time from associated …
Luminosity Functions of the Galaxy Cluster MS 1054-0321 at z=0.83 based on ACS Photometry
Goto, Tomotsugu; Ford, H. C.; Demarco, R. +41 more
We present new measurements of the galaxy luminosity function (LF) and its dependence on local galaxy density, color, morphology, and clustocentric radius for the massive z=0.83 cluster MS 1054-0321. Our analyses are based on imaging performed with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST) in the F606W, F775W,…
Derivation of elemental abundance maps at intermediate resolution from optical interpolation of lunar prospector gamma-ray spectrometer data
Pinet, Patrick C.; Kaydash, Vadim G.; Shkuratov, Yuriy G. +4 more
We propose a technique that interpolates available lunar prospector gamma-ray spectrometer (GRS) data using Clementine UVVIS spectral reflectance images. The main idea is to use low resolution GRS data as a "ground truth" to establish relationships linking optical data and geochemical information maximizing the respective correlation coefficients.…
Highly ionized gas in the local ISM: Some like it hot?
Lallement, R.; Welsh, B. Y.
We present HST-STIS medium-resolution spectra (R ∼ 6.5 km s-1) of the ultraviolet interstellar absorption lines observed towards 4 early-type stars located within the local interstellar medium (ISM), with sight-line distances <186 pc in the general direction of the Loop I superbubble (l = 330°, b = +18°). These data have been supplem…
Ion distributions in Saturn's magnetosphere near Titan
Cravens, T. E.; Ledvina, S. A.; KecskeméTy, K.
Titan's interaction with Saturn's magnetosphere is studied using a combination of a three-dimensional (3-D) single-fluid magnetohydrodynamic (MHD) simulation and a test particle/Monte Carlo model. The MHD simulation includes an exosphere model based on the one used in the work of Cravens et al. (1998), simple ionospheric processes such as ion prod…
An XMM-Newton look at the Wolf-Rayet star WR 40. The star itself, its nebula and its neighbours
Gosset, E.; Nazé, Y.; Rauw, G. +3 more
We present the results of an XMM-Newton observation of the field of the Wolf-Rayet star WR 40. Despite a nominal exposure of 20 ks and the high sensitivity of the satellite, the star itself is not detected: we thus derive an upper limit on its X-ray flux and luminosity. Joining this result to recent reports of a non-detection of some WC stars, we …