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037-B327 in M31: Luminous Globular Cluster or Core of a Former Dwarf Spheroidal Companion to M31?
Zhou, Xu; van den Bergh, Sidney; Ma, Jun +6 more
The cluster 037-B327 is of interest because it is both the most luminous and the most highly reddened cluster known in M31. Deep observations with the Advanced Camera for Surveys on the Hubble Space Telescope provide photometric data in the F606W band and also show that this cluster is crossed by a dust lane. We have determined the structural para…
Hipparcos astrometric orbits for two brown dwarf companions: HD 38529 and HD 168443
Quirrenbach, A.; Reffert, S.
Context: .HD 38529 and HD 168443 have previously been identified as systems with two substellar companion candidates using precise radial velocity measurements.Aims.We want to further constrain their orbits and the nature of the outer companions.Methods.We fit astrometric orbits of the outer substellar companions in the two systems to the Hipparco…
Optical/near-infrared observations of the black hole candidate XTE J1720-318 : from high-soft to low-hard state
Chaty, S.; Bessolaz, N.
Aims.To gain a better understanding of high-energy Galactic sources, we observed the Galactic X-ray binary and black hole candidate XTE J1720-318 in the optical and near-infrared, just after the onset of its X-ray outburst in January, 2003. These observations were obtained with the ESO/NTT as the Target of Opportunity, in February and April 2003.<…
Multiplet structure of acceleration processes in the distant magnetotail
Zelenyi, L. M.; Sauvaud, J. -A.; Grigorenko, E. E. +1 more
We have studied ion distributions measured in the Plasma Sheet Boundary Layer (PSBL) of the Earth's magnetotail by the Cluster spacecraft at X ~ -15Re. Field-aligned ion beams (beamlets) accelerated in the magnetotail to energies of ~30keV are typically observed within the interface region between the Plasma Sheet (PS) and the magnetotail lobes. P…
The Frequency of Binary Kuiper Belt Objects
Elliot, J. L.; Kern, S. D.
We estimate the frequency of widely spaced (separations greater than 0.5") Kuiper Belt binaries (KBBs) from surveys for new Kuiper Belt objects (KBOs) with the Deep Ecliptic Survey and through recovery observations for newly discovered KBOs at the Magellan telescopes. We find the frequency of KBBs versus discovery separation to be related by an in…
The intensity contrast of solar photospheric faculae and network elements. II. Evolution over the rising phase of solar cycle 23
Sanahuja, B.; Ortiz, A.; Domingo, V.
We studied the radiative properties of small magnetic elements (active region faculae and the network) during the rising phase of solar cycle 23 from 1996 to 2001, determining their contrasts as a function of heliocentric angle, magnetogram signal, and the solar cycle phase. We combined near-simultaneous full disk images of the line-of-sight magne…
Cassini observations of the Interplanetary Medium Upstream of Saturn and their relation to the Hubble Space Telescope aurora data
Dougherty, M. K.; Jackman, C. M.; Clarke, J. T. +3 more
We present Cassini magnetometer and plasma data for the January 2004 ‘solar wind campaign’ in which the particles and fields instruments monitored the solar wind and interplanetary magnetic field, while the Hubble Space Telescope (HST) simultaneously observed the UV aurora in Saturn’s southern ionosphere. Clear structuring is evident in the data w…
Small-Scale Anisotropy and Intermittence in High- and Low-Latitude Solar Wind
Velli, M.; Biferale, L.; Bigazzi, A. +1 more
We study low- and high-latitude fast solar wind data from the Ulysses spacecraft from 1992 to 1994 using for the first time a systematic method to analyze the anisotropic content of the magnetic field fluctuations beyond second-order correlation functions. We investigate all available frequencies, 1-10-6 Hz, for both high- and low-latit…
Comet 67P/Churyumov Gerasimenko: Modeling of orientation and structure
Kossacki, Konrad J.; Szutowicz, Sławomira
The comet 67P/Churyumov-Gerasimenko is the current target of the mission Rosetta, initially planned to investigate comet 46P/Wirtanen. These two comets have similar orbits, except the distance to the Sun at perihelion, but different orbital histories and different masses. Thus, structures of the nuclei can be significantly different. The evolution…
Source location of the wedge-like dispersed ring current in the morning sector during a substorm
Lundin, R.; Yamauchi, M.; Balogh, A. +8 more
Source of wedge-like dispersed sub-keV ring current ions (wedge-like structure) is investigated using Cluster CIS data. Statistics from nearly 550 traversals show that the wedge-like structure with upper energy extending to ordinary energy of ring current is found mostly in the morning sector whereas those limited within sub-keV range are found mo…