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Quasi-monochromatic ULF foreshock waves as observed by the four-spacecraft Cluster mission: 2. Oblique propagation
Balogh, A.; Dandouras, I.; Eastwood, J. P. +2 more
This paper presents the results of a statistical investigation into the nature of oblique wave propagation in the foreshock. Observations have shown that foreshock ULF waves tend to propagate obliquely to the background magnetic field. This is in contrast to theoretical work, which predicts that the growth rate of the mechanism responsible for the…
The Opacity of Spiral Galaxy Disks. III. Automating the Synthetic Field Method
Allen, Ronald J.; Holwerda, B. W.; van der Kruit, P. C. +1 more
Dust extinction in spiral disks can be estimated from the counts of background field galaxies, provided the deleterious effects of confusion introduced by structure in the image of the foreground spiral disk can be calibrated. González et al. developed a method for this calibration, the Synthetic Field Method (SFM), and applied this concept to a H…
Double Star TC-1 observations of component reconnection at the dayside magnetopause: a preliminary study
Zhang, T. L.; Dandouras, I.; Zhang, H. +13 more
In spring 2004 Double Star TC-1 measured a number of reconnection signatures at the dayside low-latitude magnetopause (MP) when there was a notable By component in the magnetosheath. In a number of events we can show that reconnection was operating nearby TC-1 in the subsolar MP region. In this paper we describe three representative eve…
The Early Multicolor Afterglow of GRB 050502a: Possible Evidence for a Uniform Medium with Density Clumps
Pian, E.; Masetti, N.; Steele, I. A. +10 more
The 2 m robotic Liverpool Telescope reacted promptly to the gamma-ray burst GRB 050502a, discovered by INTEGRAL, and started observing 3 minutes after the onset of the burst. The automatic identification of a bright afterglow with r'~15.8 mag triggered, for the first time, an observation sequence in the BVr'i' filters during the first hour after a…
Unraveling the Puzzle of the Eclipsing Polar SDSS J015543.40+002807.2 with XMM and Optical Photometry/Spectropolarimetry
Szkody, Paula; Solheim, Jan-Erik; Schmidt, Gary D. +6 more
The cataclysmic variable SDSS J015543.40+002807.2 is confirmed to be a magnetic system of the AM Herculis type. With an orbital period of 87.13 minutes, it is also the shortest period eclipsing Polar known. Monitoring with XMM-Newton finds a high-state light curve dominated by a single X-ray-emitting accretion pole located slightly prograde of the…
FUSE Observations of Interstellar and Intergalactic Absorption toward the X-Ray-bright BL Lacertae Object Markarian 421
Sembach, Kenneth R.; Savage, Blair D.; Fox, Andrew J. +1 more
High-quality Far Ultraviolet Spectroscopic Explorer (FUSE) observations at 20 km s-1 resolution of interstellar and intergalactic absorption from 910 to 1187 Å are presented for the X-ray-bright BL Lac object Mrk 421. These observations are supplemented with FUSE data for the distant halo stars BD +38°2182 and HD 93521 near the Mrk 421 …
Size and shape of ULF waves in the terrestrial foreshock
Balogh, A.; Dandouras, I.; Horbury, T. S. +3 more
Using simultaneous four spacecraft data, estimates of the size and shape of ULF waves in the terrestrial foreshock are presented. Estimates of the size of the waves in different directions are obtained by calculating the spatial autocorrelation function of the magnetic field in the wave frame using cross-correlations of magnetic field measurements…
Dust properties of UV bright galaxies at z ~ 2
Noll, S.; Pierini, D.
We investigate the properties of the extinction curve in the rest-frame UV for a sample of 34 UV-luminous galaxies at 2 < z < 2.5, selected from the FORS Deep Field (FDF) spectroscopic survey. A new parametric description of the rest-frame UV spectral energy distribution is adopted; its sensitivity to properties of the stellar populations or…
Magnetopause Processes
Escoubet, C. P.; Vaivads, A.; Fuselier, S. A. +7 more
CLASS B2108+213: a new wide-separation gravitational lens system
Pearson, T. J.; McKean, J. P.; Treu, T. +15 more
We present observations of CLASS B2108+213, the widest separation gravitational lens system discovered by the Cosmic Lens All-Sky Survey. Radio imaging using the VLA at 8.46 GHz and MERLIN at 5 GHz shows two compact components separated by 4.56 arcsec with a faint third component in between which we believe is emission from a lensing galaxy. 5-GHz…