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Cluster observations of collisionless Hall reconnection at high-latitude magnetopause
Balogh, A.; Zhang, H.; Zong, Q. -G. +6 more
The first in situ observation of collisionless Hall reconnection in the high-latitude region when the interplanetary magnetic field (IMF) By dominates is reported in this paper. On 23 March 2002, Cluster crossed the magnetopause current sheet when it traveled outbound in the Northern Hemisphere. The interface between the cusp and the ma…
Faint super-soft X-ray sources in XMM-Newton Large Magellanic Cloud fields
Haberl, F.; Kahabka, P.; Pakull, M. +4 more
Aims: We report the discovery of three faint, super-soft X-ray sources in LMC fields observed with XMM-Newton.
Methods: We analyse the three new sources together with RX J0537.7-7034 and RX J0507.1-6743, both known since ROSAT.
Results: We identify XMMU J050803.1-684017 with the LMC planetary nebula LHA 120-N 102 = LMC SMP 29. The EPIC-pn …
Dust haze in Valles Marineris observed by HRSC and OMEGA on board Mars Express
Bibring, J. -P.; Poulet, F.; Bellucci, G. +9 more
We present analysis of a bright haze observed inside Valles Marineris, which formed in mid northern spring. The data were collected by the High Resolution Stereo Camera (HRSC) and the imaging spectrometer, Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité (OMEGA), aboard Mars Express. This study provides a case example of the power…
Mass unloading along the inner edge of the Enceladus plasma torus
Gurnett, D. A.; Persoon, A. M.; Kurth, W. S. +4 more
A major discovery made by the Cassini spacecraft at Saturn was the substantial mass ejection from the south pole of Enceladus. Previous studies show that this ejected gas can become ionized and subsequently load mass onto the connecting magnetic field lines near the moon. Radial diffusion then allows the mass-loaded field lines to move outward to …
Galaxy Clusters at 0.9 < z < 1.7 in the AKARI NEP Deep Field
Goto, Tomotsugu; Inami, Hanae; Nakagawa, Takao +11 more
There is ahuge gap between the properties of red-sequence selected massive galaxy clusters at z < 1 and Lyman-break selected proto-clusters at z > 3. It is important to understand when and how the z > 3 proto-clusters evolve into passive clusters at z < 1. We aim to fill this cluster desert by using space-based N4 (4 µm) imaging …
The Intermediate Polar EI UMa: A Prepolar Cataclysmic Variable
Mukai, Koji; Ringwald, F. A.; Welsh, William F. +1 more
We present optical and X-ray time series photometry of EI UMa that reveal modulation at 746 and 770 s, which we interpret as the white dwarf spin and spin-orbit sidebands. These detections, combined with previous X-ray studies, establish EI UMa as an intermediate polar. We estimate the mass accretion rate to be ~3.6 × 1017 g s-1
Modeling UX Ursae Majoris: An Abundance of Challenges
Szkody, Paula; Sion, Edward M.; Godon, Patrick +2 more
We present a system model for optical and far-UV spectra of the nova-like variable UX UMa involving a white dwarf, secondary star, gas stream, hot spot, and accretion disk using our code BINSYN and based on an initially adopted system distance. Calculated SED intensity data successfully fit successive tomographically extracted annuli longward of t…
Spatial and temporal variations in interstellar absorption towards HD 72127AB
Welty, Daniel E.; Hobbs, L. M.; Simon, Thuso
New optical spectra of CaII and NaI towards HD 72127AB provide additional evidence for both spatial and temporal variations in the complex interstellar absorption along the two sightlines; archival ultraviolet spectra yield information on the abundances, depletions and physical conditions in the gas towards HD 72127A. Similarities in the strengths…
Ultraviolet Observations of the X-Ray Photoionized Wind of Cygnus X-1 during X-Ray Soft/High State
Bolton, C. T.; Vrtilek, S. D.; Gies, D. +2 more
High-resolution ultraviolet observations of Cygnus X-1 were obtained at two epochs roughly 1 year apart using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. Orbital phase ranges around phiorb = 0 and 0.5 were covered at each epoch, and the spectra show P Cygni line features from high (N V, C IV, Si IV) and absor…
Abundance Inhomogeneity in the Northeastern Rim of the Cygnus Loop Revealed by the Suzaku Observatory
Miller, Eric D.; Katsuda, Satoru; Uchida, Hiroyuki +5 more
We present the results of a spatially resolved spectral analysis from four Suzaku observations covering the northeastern rim of the Cygnus Loop. A two-kTe non-ionization equilibrium (NEI) model fairly well represents our data, which confirms the NEI condition of the plasma there. The metal abundances are depleted relative to the solar v…