Search Publications
3-D mesoscale MHD simulations of magnetospheric cusp-like configurations: cusp diamagnetic cavities and boundary structure
Adamson, E.; Otto, A.; Nykyri, K.
We present results from mesoscale simulations of the magnetospheric cusp region for both strongly northward and strongly southward interplanetary magnetic field (IMF). Simulation results indicate an extended region of depressed magnetic field and strongly enhanced plasma β which exhibits a strong dependence on IMF orientation. These structures cor…
Study of the applicability of the curlometer technique with the four Cluster spacecraft in regions close to Earth
Dandouras, I.; Lucek, E.; Grimald, S. +1 more
Knowledge of the inner magnetospheric current system (intensity, boundaries, evolution) is one of the key elements for the understanding of the whole magnetospheric current system. In particular, the calculation of the current density and the study of the changes in the ring current is an active field of research as it is a good proxy for the magn…
The contribution of star-forming galaxies to fluctuations in the cosmic background light
Efstathiou, G.; Kim, Han-Seek; Lacey, C. G. +3 more
Star-forming galaxies which are too faint to be detected individually produce intensity fluctuations in the cosmic background light. This contribution needs to be taken into account as a foreground when using the primordial signal to constrain cosmological parameters. The extragalactic fluctuations are also interesting in their own right as they d…
Hydrogen two-photon continuum emission from the Horseshoe filament in NGC 1275
Fabian, A. C.; Ferland, G. J.; Johnstone, R. M. +5 more
Far-ultraviolet emission has been detected from a knot of Hα emission in the Horseshoe filament, far out in the NGC 1275 nebula. The flux detected relative to the brightness of the Hα line in the same spatial region is very close to that expected from hydrogen two-photon continuum emission in the particle heating model of Ferland et al. if reddeni…
X-Ray Investigation of the Diffuse Emission around Plausible γ-Ray Emitting Pulsar Wind Nebulae in Kookaburra Region
Takahashi, Tadayuki; Bamba, Aya; Uchiyama, Yasunobu +2 more
We report on the results from Suzaku X-ray observations of the radio complex region called Kookaburra, which includes two adjacent TeV γ-ray sources HESS J1418-609 and HESS J1420-607. The Suzaku observation revealed X-ray diffuse emission around a middle-aged pulsar PSR J1420-6048 and a plausible pulsar wind nebula (PWN) Rabbit with elongated size…
Redshift-space correlation functions in large galaxy cluster surveys
Clerc, N.; Valageas, P.
Context. Large ongoing and upcoming galaxy cluster surveys in the optical, X-ray and millimetric wavelengths will provide rich samples of galaxy clusters at unprecedented depths. One key observable for constraining cosmological models is the correlation function of these objects, measured through their spectroscopic redshift.
Aims: We study t…
Molecular gas and dust in the highly magnified z ~ 2.8 galaxy behind the Bullet Cluster
Bertoldi, F.; Birkinshaw, M.; Horellou, C. +8 more
Context. The gravitational magnification provided by massive galaxy clusters makes it possible to probe the physical conditions in distant galaxies that are of lower luminosity than those in blank fields and likely more representative of the bulk of the high-redshift galaxy population.
Aims: We aim to constrain the basic properties of molecul…
Simultaneous X-ray and optical observations of thermonuclear bursts in the LMXB EXO 0748-676
Paul, Biswajit; Saripalli, Lakshmi; Archana, M.
We report the detection of a large number of optical bursts in the Low Mass X-ray Binary (LMXB) EXO 0748-676 simultaneous with the thermonuclear X-ray bursts. The X-ray and the optical bursts are detected in a long observation of this source with the XMM-Newton observatory. This has increased the number of thermonuclear X-ray bursts in the LMXBs w…
Storm and substorm effects on magnetotail current sheet motion
Lester, M.; Milan, S. E.; Fear, R. C. +1 more
Passes through the mid-region of the magnetotail by the Cluster spacecraft from 2001 to 2007 have been examined to study the dynamics of the cross-tail current sheet. Cluster is ideally placed to study this region due to the orientation of the orbit in the magnetotail, such that the current sheet is sampled at distances downtail from about 8-19 R<…
Connecting Coronal Mass Ejections and Magnetic Clouds: A Case Study Using an Event from 22 June 2009
Möstl, C.; Marubashi, K.; Howard, R. A. +5 more
On 27 June 2009 the Wind and Advanced Composition Explorer (ACE) spacecraft near Earth detected a magnetic cloud (MC). The MC can be traced back to a slow coronal mass ejection (CME) launched from the Sun on 22 June 2009 but this connection relies entirely on heliospheric imaging of the Sun-Earth line from the two STEREO spacecraft, illustrating t…