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Comparison of the effects of two models for perpendicular diffusion on cosmic-ray latitudinal gradients
Matthaeus, W. H.; Bieber, J. W.; Burger, R. A. +2 more
We compare the effects of two different models for perpendicular diffusion on the latitudinal gradients of galactic cosmic ray protons during solar minimum conditions. These two models correspond to the newly developed non-linear guiding center theory [Matthaeus, W.H., Qin, G., Bieber, J.W., Zank, G.P. Nonlinear collisionless perpendicular diffusi…
A Study of Far-Ultraviolet Extinction in the Upper Scorpius Cloud Using the SPINR Sounding Rocket Experiment
Chakrabarti, S.; Lewis, N. K.; Cook, T. A.
In this study, six new interstellar extinction curves in the far-ultraviolet are presented using data from a sounding rocket experiment. The sounding rocket data were combined with IUE data for six lines of sight in the Upper Scorpius group to cover the wavelength range of 912-3030 Å. The extinction curves were produced using the pair comparison m…
Probing the dark matter profile of hot clusters and the M- T relation with XMM- Newton
Arnaud, M.; Pointecouteau, E.; Pratt, G. W.
We present results based on XMM- Newton observations of a small sample of hot galaxy clusters. Making a full use of XMM- Newton's spectro-imaging capabilities, we have extracted the radial temperature profile and gas density profile, and with this information, calculated the total mass profile of each cluster (under the assumption of hydrostatic e…
Probing the nuclear obscuration in radio-galaxies with near infrared imaging
Capetti, A.; Marchesini, D.; Celotti, A.
We present the first near-infrared (K'-band) homogeneous observations of a complete sub-sample of the 3CR radio catalogue comprising all High Excitation Galaxies (HEGs) at z <0.3. After showing that the surface brightness decomposition technique to measure central point-like sources is affected by significant uncertainties for the objects in th…
Coupling the Solar-Wind/IMF to the Ionosphere Through the High Latitude CUSPS
Maynard, Nelson C.
Magnetic merging is a primary means for coupling energy from the solar wind into the magnetosphere–ionosphere system. The location and nature of the process remain as open questions. By correlating measurements from diverse locations and using large-scale MHD models to put the measurements in context, it is possible to constrain our interpretation…
A search for warm-hot intergalactic medium features in the X-ray spectra of Mkn 421 with the XMM-Newton RGS
Tagliaferri, G.; Ghisellini, G.; Tavecchio, F. +2 more
We present the high-resolution X-ray spectra of Mkn 421 obtained in November 2003 with the RGS aboard the XMM-Newton satellite. This Target of Opportunity observation was triggered because the source was in a high state of activity in the X-ray band. These data are compared with three archival RGS observations of the same source performed in Novem…
A High-Resolution Mosaic of Molecular Gas in Stephan's Quintet
Petitpas, Glen R.; Taylor, Christopher L.
We present high-resolution 12CO J=1-0 observations of the molecular gas in the Hickson compact group Stephan's Quintet (HCG 92). Our observations consist of multiple pointings and mosaics covering all the regions where CO and star formation have been detected. Within the 100" field of view centered on the easternmost tidal tail, we dete…
Cluster Populations in Abell 2125 and 2218
Schombert, James; Rakos, Karl
We combine new narrowband photometry with archival Wide Field Planetary Camera 2 (WFPC2) data for A2218 (z=0.18) and A2125 (z=0.25), two clusters with intermediate redshifts but very different cluster properties, in order to examine the evolution of galaxy populations. A2218 is a dense, elliptical-rich cluster (Bautz-Morgan type II) similar to the…
Double Star project - master science operations plan
Liu, Z.; Shen, C.
For Double Star Project (DSP) exploration, the scientific operations are very important and essential for achieving its scientific objectives. Two years before the launch of the DSP satellites (TC-1 and TC-2) and during the mission operating phase, the long-term and short-term master science operations plans (MSOP) were produced. MSOP is composed …
Simultaneous Double Star and Cluster FTEs observations on the dawnside flank of the magnetosphere
Balogh, A.; Fazakerley, A. N.; Owen, C. J. +8 more
We present Cluster and Double Star-1 (TC-1) observations from a close magnetic conjunction on 8 May 2004. The five spacecraft were on the dawnside flank of the magnetosphere, with TC-1 located near the equatorial plane and Cluster at higher geographic latitudes in the Southern Hemisphere. TC-1, at its apogee, skimmed the magnetopause for almost 8h…