Search Publications

Observation of the lower hybrid waves near the three-dimensional null pair

Vaivads, A.; Andre, M.; Fu, Song +8 more

Magnetic reconnection is a fundamental process in plasma, which is thought to play important roles both in laboratory and natural plasmas through affecting magnetic topology, heating and accelerating particles. During an event on Oct. 1st, 2001, the Cluster tetrahedron circled around the magnetic reconnection region several times, and Xiao et al. …

HD 51106 and HD 50747: an ellipsoidal binary and a triple system observed with CoRoT

Auvergne, M.; Amado, P. J.; Poretti, E. +13 more

Context: We present an analysis of the observations of HD 51106 and HD 50747 by the satellite CoRoT, obtained during its initial run, and of the spectroscopic preparatory observations.
Aims: We complete an analysis of the light curve, extract the main frequencies observed, and discuss some preliminary interpretations about the stars.
Metho…

Cross-correlations between 21 cm, X-ray and infrared backgrounds

Shan, Huan-Yuan; Qin, Bo

The history of the cosmological reionization is still unclear. Two ionizing sources, stars and QSOs, are believed to play important roles during this epoch. Besides the 21 cm signals, the infrared emission from Pop III stars and X-ray photons from QSOs can be powerful probes of the reionization. Here we present a cross-correlation study of the 21c…

Hard X-Ray Flux Upper Limits of Central Compact Objects in Supernova Remnants

Kalemci, E.; Erdeve, I.; Alpar, M. A.

We searched for hard X-ray (20-300 keV) emission from nine central compact objects (CCOs) 1E 1207.4-5209, 1WGA J1713-3949, J082157.5-430017, J085201.4-461753, J160103.1-513353, J1613483-5055, J181852.0-150213, J185238.6+004020, and J232327.9+584843 with the International Gamma-Ray Astrophysics Laboratory observatory. We applied spectral imaging an…

The evolution of spheroidal galaxies in different environments

Ziegler, B. L.; Fritz, A.

We analyse the kinematic and chemical evolution of 203 distant spheroidal (elliptical and S0) galaxies at 0.2<z<0.8 which are located in different environments (rich clusters, low-mass clusters and in the field). VLT/FORS and CAHA/MOSCA spectra with intermediate-resolution have been acquired to measure the internal kinematics and stellar pop…

Solar off-limb line widths with SUMER: revised value of the non-thermal velocity and new results

Dolla, L.; Solomon, J.

Alfvén waves and ion-cyclotron absorption of high-frequency waves are frequently brought into models devoted to coronal heating and fast solar-wind acceleration. Signatures of ion-cyclotron resonance have already been observed in situ in the solar wind and in the upper corona. In the lower corona, one can use the line profiles to infer the ion tem…

Automated techniques for the analysis of magnetic field inversion in filaments with the Solar Feature Catalogue

Aboudarham, J.; Ipson, S.; Zharkova, V. +3 more

Detectability of rotation-powered pulsars in future hard X-ray surveys

Wang, Wei

Recent INTEGRAL/IBIS hard X-ray surveys have detected about 10 young pulsars. We show hard X-ray properties of these 10 young pulsars, which have a luminosity of 10³³-10³⁷ erg s^-1 and a photon index of 1.6-2.1 in the energy range of 20-100 keV. The correlation between X-ray luminosity and spin-down power of L_X…

Near-infrared imaging and spectroscopy of the nuclear region of the disturbed Virgo cluster spiral NGC4438

Casassus, Simon; Kenney, Jeffrey D. P.; Cortés, Juan R. +1 more

We present near-infrared (NIR) Very Large Telescope (VLT) Infrared Spectrometer and Array Camera (ISAAC) imaging and spectroscopy of the peculiar Virgo galaxy NGC4438, whose nucleus has been classified as a low-ionization nuclear emission-line region (LINER). The data are supplemented by mid-infrared imaging, and compared to previous HST broad-ban…

Reply to comment by H. Hasegawa on “Evolution of Kelvin-Helmholtz activity on the dusk flank magnetopause”

Farrugia, C. J.; Fazakerley, A. N.; Owen, C. J. +3 more

Abstract Available from http://www.agu.org