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Asteroid 2867 Steins. II. Multi-telescope visible observations, shape reconstruction, and rotational state
Jorda, L.; Lamy, P. L.; Colas, F. +14 more
Context: Asteroid 2867 Steins is the first target of the Rosetta space mission with a flyby scheduled in September 2008.
Aims: An early physical characterization is needed to optimize the flyby parameters and the science operations, and to maximize the scientific return. The aim of this article is to characterize the shape and rotational state…
A Comparison of Solar Open Field Regions Found by Type III Radio Bursts and the Potential Field Source Surface Model
DeRosa, Marc L.; Nitta, Nariaki V.
For heliophysics research and applications, the potential field source surface (PFSS) model is often employed to extrapolate the photospheric magnetic field to the corona. In an attempt to evaluate the performance of the PFSS model, we compare the computed footpoints of the heliospheric magnetic field with the locations of flares associated with t…
Supernova Remnants in the AKARI IRC Survey of the Large Magellanic Cloud
Onaka, Takashi; Ita, Yoshifusa; Seok, Ji Yeon +9 more
We present a near- to mid-infared study of supernova remnants (SNRs) using the AKARI IRC Survey of the Large Magellanic Cloud (LMC). The LMC survey observed about a10 square degree area of the LMC in five bands centered at 3, 7, 11, 15, and 24 µm using the Infrared Camera (IRC) aboard AKARI. The number of SNRs in the survey area is 21, which…
Non-thermal bremsstrahlung from supernova remnants and the effect of Coulomb losses
Vink, Jacco
Aims: We investigate the shape of the electron cosmic ray spectrum in the range up to ~1000 keV, assuming that the acceleration process at the shock results in a power law in momentum, and that downstream of the shock the spectrum is affected by Coulomb interactions with background electrons only.
Methods: In the non-relativistic regime one ca…
Spatio-temporal structure of a poloidal Alfvén wave detected by Cluster adjacent to the dayside plasmapause
Pierrard, V.; Glassmeier, K. H.; Blomberg, L. G. +4 more
A case study of a poloidal ULF pulsation near the dayside plasmapause is presented based on Cluster observations of magnetic and electric fields. The pulsation is detected close to the magnetic equatorial plane at L shells L=[4.4, 4.6] and oscillates with a frequency of f=23 mHz. Investigating the wave energy flux reveals the standing wave nature …
On the morphology of sigma-drop galaxies
Knapen, J. H.; Comerón, S.; Beckman, J. E.
Context: Local reductions of the stellar velocity dispersion in the central regions of galaxies are known as sigma-drops (σ-drops). Knowing the origin of these features can lead to better understanding of inner galactic dynamics.
Aims: We present a sample of 20 σ-drop galaxies matched with a control sample of galaxies without σ-drop in order t…
Environmental effects on the globular cluster blue straggler population: a statistical approach
Moretti, A.; Piotto, G.; de Angeli, F.
Context: Blue stragglers stars (BSS) constitute an ubiquitous population of objects whose origin involves both dynamical and stellar evolution.
Aims: In this paper we study the properties of a catalogue of BSS extracted from an homogeneous sample of 56 Galactic globular clusters (GC) observed with Wide-Field Planetary Camera 2 on board of Hubb…
A Study of the Long-Term Evolution of Quasi-Periodic Oscillations in the Accretion-Powered X-Ray Pulsar 4U 1626-67
Paul, Biswajit; Kumar, Brijesh; Kaur, Ramanpreet +1 more
We report here a study of the long-term properties of quasiperiodic oscillations (QPOs) in an unusual accreting X-ray pulsar, 4U 1626-67. This is a unique accretion-powered X-ray pulsar in which we have found the QPOs to be present during all sufficiently long X-ray observations with a wide range of X-ray observatories. In the present spin-down er…
Anisotropy Signatures of Solar Energetic Particle Transport in a Closed Interplanetary Magnetic Loop
Sáiz, A.; Ruffolo, D.; Bieber, J. W. +2 more
Recent studies have stressed the importance of solar energetic particle (SEP) transport under disturbed interplanetary conditions, including the case of detection inside a closed interplanetary magnetic loop ejected by a preceding solar event. In this case, particles might be observed to arrive from the far leg of the loop, thus arriving at the de…
A New Twist to an Old Story: HE 0450-2958 and the ULIRG → Optically Bright QSO Transition Hypothesis
Wilner, David J.; Wagg, Jeff; Papadopoulos, Padeli P. +1 more
We report on interferometric imaging of the CO J = 1-0 and J = 3-2 line emission from the controversial QSO/galaxy pair HE 0450-2958. The detected CO J = 1-0 line emission is found associated with the disturbed companion galaxy, not the luminous QSO, and implies Mgal(H2) ~ (1-2) × 1010 M⊙, which is gtrsi…