Search Publications
Cluster vision of the magnetotail current sheet on a macroscale
Petrukovich, A. A.; Balogh, A.; Nakamura, R. +2 more
With Cluster 2001-2003 observations at ∼20 RE downtail we determine the cross-tail current sheet configuration via mapping of the neutral sheet positions and direct measurements of the sheet inclination. The warping effect tilts both flanks of the sheet up to 40° in the YZ GSM plane, while the gradual hinging effect tilts the sheet up t…
Long-Term INTEGRAL and RXTE Observations of the X-Ray Pulsar LMC X-4
Tsygankov, S. S.; Lutovinov, A. A.
We analyze the observations of the X-ray pulsar LMCX-4 performed by the INTEGRAL observatory and the All-Sky Monitor (ASM) of the RXTE observatory over a wide energy range. The observed hard X-ray flux from the source is shown to change by more than a factor of 50 (from ∼70 mCrab in the high state to ∼1.3 mCrab in the low state) on the time scale …
On the formation and evolution of magnetic chemically peculiar stars in the solar neighborhood
Paunzen, E.; Maitzen, H. M.; Pöhnl, H.
In order to put strict observational constraints on the evolutionary status of the magnetic chemically peculiar stars (CP2) of the upper main sequence, we have investigated a well established sample of galactic field CP2 objects within a radius of 200 pc from the Sun in the (X,Y) plane. In total, 182 stars with accurate parallax measurements from …
A new infrared view of evolved stars in IZw 18
Östlin, G.; Mouhcine, M.
We report results from near-infrared imaging of IZw 18, the most metal-poor galaxy in the local universe, with NICMOS on board the Hubble Space Telescope (HST). Observations were obtained in the broad F205W filter (~K) and in the medium-wide bands F171M and F180M, the latter which cover strong molecular absorption features in cool stars. The new d…
FIRBACK. IV. Towards the nature of the 170 µm source population
Dole, H.; Lagache, G.; Vaccari, M. +5 more
We present a detailed study of the brighter (>4σ detections) sources in the 170 µm FIRBACK northern N1 ISO survey, with the help of complementary data in the optical, radio, and mid-IR domain. For 82% of them, an optical galaxy counterpart is identified, either as the unique source of the IR emission, or as part of a multiple identificati…
Radio Observations of the Hubble Deep Field-South Region. I. Survey Description and Initial Results
Williams, Robert E.; Norris, Ray P.; Hopkins, Andrew M. +8 more
This paper is the first of a series describing the results of the Australia Telescope Hubble Deep Field-South radio survey. The survey was conducted at four wavelengths, 20, 11, 6, and 3 cm, over a 4 year period and achieves an rms sensitivity of about 10 µJy at each wavelength. We describe the observations and data reduction processes and p…
Cluster AgeS Experiment (CASE): Dwarf Novae and a Probable Microlensing Event in the Globular Cluster M22
Pietrukowicz, P.; Thompson, I. B.; Schwarzenberg-Czerny, A. +4 more
We report the identification of a new cataclysmic variable (denoted as CV2) and a probable microlensing event in the field of the globular cluster M22. Two outbursts were observed for CV2. During one of them superhumps with P_sh=0.0887 d were present in the light curve. CV2 has an X-ray counterpart detected by XMM-Newton. A very likely microlensin…
On Three-Dimensional Magnetic Skeleton Elements Due to Discrete Flux Sources
Longcope, D. W.; Beveridge, C.
The magnetic field in the solar corona plays an important role in coronal heating, flaring activity and many other phenomena studied on the Sun. Magnetic topology is frequently used to understand complicated coronal magnetic fields. By calculating the skeleton of a field, it is possible to build up a sophisticated representation of the key element…
Downscattering Due to Wind Outflows in Compact X-Ray Sources: Theory and Interpretation
Titarchuk, Lev; Shrader, Chris
A number of recent lines of evidence point toward the presence of hot, outflowing plasma from the central regions of compact Galactic and extragalactic X-ray sources. In addition, it has long been noted that many of these sources exhibit an ``excess'' continuum component above ~10 keV, usually attributed to Compton reflection from a static medium.…
Thermal and non-thermal effects driven by magnetic reconnections observed in a confined flare
Schmieder, B.; Li, H.; Berlicki, A.
In order to better understand the energy processes occurring during the impulsive phase of solar flares we compare observations with our magnetic model calculations. We study the 1N/M1.9 confined flare of 20 October 2003 observed during a Joint Observation Program (JOP157), and concentrate on the spectral analysis of the Reuven Ramaty High Energy …