Search Publications
Magnetic Interaction: A Transequatorial Jet and Interconnecting Loops
Yang, Jiayan; Wang, Jingxiu; Shen, Yuandeng +2 more
We present, to our knowledge for the first time, a rare observation of direct magnetic interaction between a transequatorial jet and interconnecting loops (IL) in the southern hemisphere. The jet originated from a flare and appeared to move outward along open field lines, but it passed so close to the IL that its edge met with one of the IL ends. …
Venus Express observes a new type of shock with pure kinematic relaxation
Zhang, T. L.; Balikhin, M. A.; Gedalin, M. +2 more
Collisionless shocks are present in the vicinity of many astrophysical objects such as supernova remnants, space jets, stars and planets immersed in the supersonic flow of stellar winds. Understanding the shock structure is crucial for understanding the processes of the redistribution of the upstream flow energy into accelerated particles and form…
X-Ray-emitting Ejecta in Puppis A Observed with Suzaku
Petre, Robert; Hwang, Una; Flanagan, Kathryn A.
We report the detection and localization of X-ray-emitting ejecta in the middle-aged Galactic supernova remnant Puppis A using five observations with the Suzaku X-Ray Imaging Spectrometer to survey the eastern and middle portions of the remnant. A roughly 3' × 5', double-peaked region in the north center is found to be highly enriched in Si and ot…
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…