Search Publications
Suzaku Discovery of Hard X-Ray Pulsations from a Rotating Magnetized White Dwarf, AEAquarii
Dotani, Tadayasu; Ishida, Manabu; Hayashi, Takayuki +7 more
A fast rotating magnetized white dwarf, AEAquarii, was observed with Suzaku, in 2005 October-November and 2006 October with exposures of 53.1 and 42.4ks, respectively. In addition to clear spin modulation in the 0.5-10keV band of the XIS data at the barycentric period of 33.0769±0.0001s, the 10-30keV HXD data in the second half of the 2005 observa…
Initial Venus Express magnetic field observations of the magnetic barrier at solar minimum
Barabash, S.; Russell, C. T.; Zhang, T. L. +8 more
Although there is no intrinsic magnetic field at Venus, the convected interplanetary magnetic field piles up to form a magnetic barrier in the dayside inner magnetosheath. In analogy to the Earth's magnetosphere, the magnetic barrier acts as an induced magnetosphere on the dayside and hence as the obstacle to the solar wind. It consists of regions…
Validation of a synoptic solar wind model
Gombosi, T. I.; Roussev, I. I.; Cohen, O. +1 more
We present a validation of a three-dimensional magnetohydrodynamic model for the solar corona and the inner heliosphere. We compare the results of the model with long-term satellite data at 1 AU for a 1 year period during solar minimum and another year period of solar maximum. Overall, the model predicts rather well the magnitude of the magnetohyd…
Understanding the 8 µm versus Paα Relationship on Subarcsecond Scales in Luminous Infrared Galaxies
Colina, Luis; Alonso-Herrero, Almudena; Díaz-Santos, Tanio +3 more
This work explores in detail the relation between the 8 µm and the Paα emissions for 122 H II regions identified in a sample of 10 low-z LIRGs with nearly constant metallicity [12 + log (O/H) ~ 8.8]. We use Gemini T-ReCS high spatial resolution (lesssim0.4''~120 pc for the average distance of 60 Mpc of our sample) mid-infrared imaging (at 8.…
Solar Magnetic Tracking. II. The Apparent Unipolar Origin of Quiet-Sun Flux
Lamb, D. A.; DeForest, C. E.; Hagenaar, H. J. +2 more
We investigate the origin of small-scale flux concentrations in the quiet Sun. In apparent violation of the physical requirement for flux balance, 94% of the features containing newly detected flux are unipolar at a resolution of 1.2''. We analyze 2619 of these apparent unipolar emergences in an image sequence from the SOHO MDI magnetograph and co…
Radio-to-UV monitoring of AO 0235+164 by the WEBT and Swift during the 2006-2007 outburst
Lee, C. -U.; Lähteenmäki, A.; Umana, G. +58 more
Context: The blazar
First high-energy observations of narrow-line Seyfert 1s with INTEGRAL/IBIS
de Rosa, A.; Masetti, N.; Bird, A. J. +8 more
Narrow-line Seyfert 1 (NLS1) galaxies are very interesting objects which display peculiar properties when compared to their broad-line analogues (BLS1). Although well studied in many wavebands, their behaviour at >10 keV is poorly studied and yet important to discriminate between models invoked to explain the complexity observed in the X-ray ba…
Dune-forming winds on Titan and the influence of topography
Tokano, Tetsuya
Numerous extended dunes on Saturn's moon Titan detected by the Cassini RADAR constrain the long-term pattern of surface winds. We analyse the statistics of surface wind speed and direction and their spatial and temporal variability predicted by a general circulation model (GCM) in order to constrain surface wind predictions of this GCM by dune obs…
An 84-µG magnetic field in a galaxy at redshift z = 0.692
Jorgenson, Regina A.; Heiles, Carl; Wolfe, Arthur M. +2 more
The magnetic field pervading our Galaxy is a crucial constituent of the interstellar medium: it mediates the dynamics of interstellar clouds, the energy density of cosmic rays, and the formation of stars. The field associated with ionized interstellar gas has been determined through observations of pulsars in our Galaxy. Radio-frequency measuremen…
Automatic Detection and Classification of Coronal Holes and Filaments Based on EUV and Magnetogram Observations of the Solar Disk
Habbal, Shadia Rifai; Scholl, Isabelle F.
A new method for the automated detection of coronal holes and filaments on the solar disk is presented. The starting point is coronal images taken by the Extreme Ultraviolet Telescope on the Solar and Heliospheric Observatory (SOHO/EIT) in the Fe IX/X 171 Å, Fe XII 195 Å, and He II 304 Å extreme ultraviolet (EUV) lines and the corresponding full-d…