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Energetic ion acceleration in Saturn's magnetotail: Substorms at Saturn?
Krupp, N.; Dougherty, M. K.; Krimigis, S. M. +11 more
The Magnetospheric Imaging Instrument (MIMI) Ion and Neutral Camera (INCA) on the Cassini spacecraft has recorded abrupt increases in energetic neutral atom flux coming from the general direction of Saturn's magnetotail. These bursts of ion activity in the tail are well correlated with enhancements in the Saturn kilometric radiation. Given the sim…
Solar wind control of the radial distance of the magnetic reconnection site in the magnetotail
Nakamura, R.; Fujimoto, M.; Baumjohann, W. +6 more
To understand magnetotail dynamics, it is essential to determine where magnetic reconnection takes place in the near-Earth magnetotail during substorms. The Geotail spacecraft thoroughly surveyed the near-Earth plasma sheet at radial distances of 10-31 RE during the years 1995-2003. Thirty-four clear reconnection events were identified …
An XMM-Newton view of the cluster of galaxies Abell 85
Forman, W.; Durret, F.; Lima Neto, G. B.
We have observed the cluster of galaxies Abell 85 with XMM-Newton. These data have allowed us in a previous paper to confirm the existence of the extended 4 Mpc filament detected by the ROSAT PSPC in the neighbourhood of this cluster, and to determine an X-ray temperature of about ~ 2 keV. We now present a thorough analysis of the properties of th…
Characteristics of the interplanetary coronal mass ejections in the heliosphere between 0.3 and 5.4 AU
Wang, C.; Richardson, J. D.; Du, D.
We identify and characterize interplanetary coronal mass ejections (ICMEs) observed by spacecraft in the solar wind, namely Helios 1 and 2, PVO, ACE, and Ulysses, which together cover heliocentric distances from 0.3 to 5.4 AU. The primary identification signature used to look for ICMEs is abnormally low proton temperatures. About 600 probable ICME…
A Young Brown Dwarf Companion to DH Tauri
Kobayashi, Naoto; Usuda, Tomonori; Pyo, Tae-Soo +20 more
We present the detection of a young brown dwarf companion, DH Tau B, associated with the classical T Tauri star DH Tau. Near-infrared coronagraphic observations with CIAO on the Subaru Telescope have revealed DH Tau B with H=15 mag located 2.3" (330 AU) away from the primary, DH Tau A. Comparing its position with a Hubble Space Telescope archive i…
Saturn's moon Phoebe as a captured body from the outer Solar System
Lunine, Jonathan I.; Johnson, Torrence V.
The orbital properties of Phoebe, one of Saturn's irregular moons, suggest that it was captured by the ringed planet's gravitational field rather than formed in situ. Phoebe's generally dark surface shows evidence of water ice, but otherwise the surface most closely resembles that of C-type asteroids and small outer Solar System bodies such as Chi…
The nature of the molecular gas system in the core of NGC 1275
Edge, A. C.; Johnstone, R. M.; Wilman, R. J.
We present near-infrared integral field spectroscopy of the central kiloparsec of NGC 1275 at the heart of the Perseus cluster of galaxies, obtained with the Integral Field Unit (IFU) of the United Kingdom Infrared Telescope (UKIRT) Imaging Spectrometer (UIST). The nuclear ro-vibrational H2 emission is spatially resolved and is likely t…
Crystalline Silicates
Kemper, Ciska; Molster, Frank
One of the big surprises of the Infrared Space Observatory (ISO) has been discovery of crystalline silicates outside our own Solar system. It was generally assumed before that all cosmic silicates in space were of amorphous structure. Thanks to ISO we know now that crystalline silicates are ubiquitous in the Galaxy (except for the diffuse ISM) and…
Energetic particle injections in Saturn's magnetosphere
Krupp, N.; Krimigis, S. M.; Mitchell, D. G. +9 more
Measurements from the Cassini Magnetospheric Imaging Instrument (MIMI) beginning in July 2004 reveal that sudden planetward injections of energetic ions (5-200 keV) and electrons (20-200 keV) over confined regions of azimuth are pervasive events in Saturn's magnetosphere over the radial range of 3.8 to 11.2 Saturn radii (RS). Saturn is …
A highly-ionized absorber in the X-ray binary 4U 1323-62: A new explanation for the dipping phenomenon
Kaastra, J. S.; Díaz Trigo, M.; Parmar, A. N. +2 more
We report the detection of narrow Fe XXV and Fe XXVI X-ray absorption lines at 6.68 ± 0.04 keV and 6.97 ± 0.05 keV in the persistent emission of the dipping low-mass X-ray binary 4U 1323-62 during a 2003 January XMM-Newton observation. These features are superposed on a broad emission feature centered on 6.6 +0.1-0.2 keV. Dur…