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Stream Interactions and Interplanetary Coronal Mass Ejections at 5.3 AU near the Solar Ecliptic Plane
Luhmann, J. G.; Russell, C. T.; Jian, L. K. +2 more
We have performed a survey of the characteristics of two types of large spatial-scale solar-wind structures, stream interaction regions (SIRs), and interplanetary coronal mass ejections (ICMEs), near 5.3 AU, using solar-wind observations from Ulysses. Our study is confined to the three aphelion passes of Ulysses, and also within ± 10° of the solar…
Modeling of Saturn kilometric radiation arcs and equatorial shadow zone
Cecconi, B.; Lamy, L.; Zarka, P. +2 more
Accelerated electrons gyrating around Saturn's auroral (high latitude) magnetic field lines generate the intense Saturnian kilometric radiation (SKR). This radio emission is thought to be generated via the cyclotron maser instability (CMI) that predicts a strong anisotropy of the beaming pattern of the emission. Resulting visibility effects were s…
Global characteristics of GRBs observed with INTEGRAL and the inferred large population of low-luminosity GRBs
McGlynn, S.; McBreen, S.; Foley, S. +2 more
Context: INTEGRAL has two sensitive gamma-ray instruments that have detected and localised 47 gamma-ray bursts (GRBs) from its launch in October 2002 up to July 2007.
Aims: We present the spectral, spatial, and temporal properties of the bursts in the INTEGRAL GRB catalogue using data from the imager, IBIS, and spectrometer, SPI.
Methods: …
Discovery of a transient radiation belt at Saturn
Krupp, N.; Jones, G. H.; Roussos, E. +7 more
Radiation belts have been detected in situ at five planets. Only at Earth however has any variability in their intensity been heretofore observed, in indirect response to solar eruptions and high altitude nuclear explosions. The Cassini spacecraft's MIMI/LEMMS instrument has now detected systematic radiation belt variability elsewhere. We report t…
FERENGI: Redshifting Galaxies from SDSS to GEMS, STAGES, and COSMOS
Barden, M.; Häußler, B.; Jahnke, K.
We describe the creation of a set of artificially "redshifted" galaxies in the range 0.1 < z < 1.1 using a set of ~100 SDSS low-redshift (v < 7000 km s-1) images as input. The intention is to generate a training set of realistic images of galaxies of diverse morphologies and a large range of redshifts for the GEMS and COSMOS ga…
A Hubble Space Telescope transit light curve for GJ 436b
Reiners, A.; Dreizler, S.; Benedict, G. F. +6 more
We present time series photometry for six partial transits of GJ 436b obtained with the Fine Guidance Sensor instrument on the Hubble Space Telescope (HST). Our analysis of these data yields independent estimates of the host star's radius Rstar = 0.505+0.029-0.020 R⊙, and the planet's orbital period P = …
Cumulative hard X-ray spectrum of local AGN: a link to the cosmic X-ray background
Sunyaev, R.; Krivonos, R.; Revnivtsev, M. +2 more
Aims: We determine the cumulative spectral energy distribution (SED) of local active galactic nuclei (AGN) in the 3-300 keV band and compare it with the spectrum of the cosmic X-ray background (CXB) in order to test the widely accepted paradigm that the CXB is a superposition of AGN and to place constraints on AGN evolution.
Methods: We perfor…
Cosmic Evolution of Stellar Disk Truncations: From z ~ 1 to the Local Universe
Beckman, J. E.; Trujillo, I.; Azzollini, R.
We have conducted the largest systematic search so far for stellar disk truncations in disklike galaxies at intermediate redshift (z < 1.1), using the Great Observatories Origins Deep Survey-South (GOODS-S) data from the Hubble Space Telescope ACS. Focusing on type II galaxies (i.e., downbending profiles), we explore whether the position of the…
A Spectroscopic Orbit for Regulus
Rivinius, Th.; Štefl, S.; Baade, D. +8 more
We present a radial velocity study of the rapidly rotating B star Regulus that indicates the star is a single-lined spectroscopic binary. The orbital period (40.11 days) and probable semimajor axis (0.35 AU) are large enough that the system is not interacting at present. However, the mass function suggests that the secondary has a low mass (M…
Cassini UVIS observations of the Io plasma torus. IV. Modeling temporal and azimuthal variability
Delamere, P. A.; Bagenal, F.; Steffl, A. J.
In this fourth paper in a series, we present a model of the remarkable temporal and azimuthal variability of the Io plasma torus observed during the Cassini encounter with Jupiter. Over a period of three months, the Cassini Ultraviolet Imaging Spectrograph (UVIS) observed a dramatic variation in the average torus composition. Superimposed on this …