Search Publications
Missions
Journals
Publication Years
SUMER-Hinode observations of microflares: excitation of molecular hydrogen
Innes, D. E.
Context: Concentrations of H2 have been detected by SUMER in active region plage. The H2 is excited by O VI line emission at 1031.94 Å which, although not observed, must be brightening along with the observed transition region line, Si III 1113.24 Å.
Aims: We investigate the excitation of H2 and demonstrate the association between the observed…
The FERRUM project: experimental and theoretical transition rates of forbidden [Sc II] lines and radiative lifetimes of metastable Sc II levels
Lundberg, H.; Hartman, H.; Hibbert, A. +6 more
Context: In many plasmas, long-lived metastable atomic levels are depopulated by collisions (quenched) before they decay radiatively. In low-density regions, however, the low collision rate may allow depopulation by electric dipole (E1) forbidden radiative transitions, so-called forbidden lines (mainly M1 and E2 transitions). If the atomic transit…
Implication for Super-Critical Accretion Flow in the Narrow-Line Seyfert 1 Galaxy PKS 0558-504
Kunieda, Hideyo; Haba, Yoshito; Terashima, Yuichi +1 more
We present results from XMM-Newton observations of the narrow-line Seyfert 1 galaxy PKS0558-504. The 2-12keV X-ray spectra can be well-reproduced by a single power law with a photon index of ∼2.2. The extrapolation of this power law continuum into the lower energy band reveals the existence of a strong soft excess component. When we applied a mult…
Evaluation of bispectrum in the wave number domain based on multi-point measurements
Glassmeier, K. -H.; Décréau, P. M. E.; Narita, Y. +3 more
We present an estimator of the bispectrum, a measure of three-wave couplings. It is evaluated directly in the wave number domain using a limited number of detectors. The ability of the bispectrum estimator is examined numerically and then it is applied to fluctuations of magnetic field and electron density in the terrestrial foreshock region obser…
Statistical study of radio drifting pulsation structures with associated CMEs and other observations
Yan, Y. H.; Liu, Y. Y.; Wang, S. J. +5 more
Solar radio burst, especially the fine structures (FSs) and the drifting pulsation structures (DPSs), may be used as an important diagnostics tool to draw the evolution map of the flare loop in the initial phase of solar flares. In this work, 52 radio events were found accompanying with DPSs. They were all observed with the Solar Radio Spectromete…
Spitzer mid-infrared study of compact H II regions in the Magellanic Clouds
Heydari-Malayeri, M.; Charmandaris, V.; Chatzopoulos, E.
Aims: We present a study of the mid-infrared properties and dust content of a sample of 27 H ii “blobs”, a rare class of compact H ii regions in the Magellanic Clouds. A unique feature of this sample is that even though these H ii regions are of high and low excitation they have nearly the same physical sizes ~1.5-3 pc.
Methods: We base our an…
Modeling Pulsar Wind Nebulae
Bucciantini, N.
In the last few years, new observations by CHANDRA and XMM have shown that Pulsar Wind Nebulae present complex but similar inner features, with the presence of axisymmetric rings and jets, which are generally referred to as a jet-torus structure. Due to the rapid growth in accuracy and robustness of numerical schemes for relativistic fluid-dynamic…
EA01A/B: High-Resolution H I Imaging of an Interacting Pair of Poststarburst (E+A) Galaxies
Dejonghe, Herwig; De Rijcke, Sven; Buyle, Pieter
We present high spatial resolution 21 cm H I observations of EA01A and EA01B, a pair of interacting poststarburst, or E+A, galaxies at z = 0.0746. Based on optical HST/WFPC2 images, both galaxies are known to display disturbed morphologies. They also appear to be linked by a bridge of stars. Previous H I observations by Chang et al. in 2001 had al…
Finite difference time domain simulation of radar wave propagation through comet nuclei dielectric models
Heggy, Essam; Carley, Ruth A.
The 90 MHz radar-wave experiment, Comet Nucleus Sounding Experiment by Radiowave Transmission (CONSERT), on board the Rosetta mission (ESA, 2004) is expected to probe the nucleus of the comet 67P/Churyumov-Gerasimenko (67P/C-G) to reveal information on its physical properties, chemical composition, and internal structure. This investigation assess…
The INTEGRAL long monitoring of persistent ultra compact X-ray bursters
Bird, A. J.; Fiocchi, M.; Ubertini, P. +3 more
Context: The combination of compact objects, short period variability and peculiar chemical composition of the ultra compact X-ray binaries make up a very interesting laboratory to study accretion processes and thermonuclear burning on the neutron star surface. Improved large optical telescopes and more sensitive X-ray satellites have increased th…