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Effects of plasma sheet variability on the fast initial ring current decay
Thomsen, M. F.; Kistler, L. M.; Mouikis, C. G. +1 more
We study the effects of plasma sheet variations on the fast initial ring current (RC) decay during the March 31, 2001 storm. Previous studies have focused on the effects of enhanced plasma sheet density on RC buildup during the main phase of the storms. Using model simulations and energetic particle data from the instruments on CLUSTER and LANL, w…
Gas-phase CO2, C2H2, and HCN toward Orion-KL
van Dishoeck, E. F.; Wright, C. M.; Lahuis, F. +3 more
The infrared spectra toward Orion-IRc2, Peak 1 and Peak 2 in the 13.5-15.5 mu m wavelength range are presented, obtained with the Short Wavelength Spectrometer on board the Infrared Space Observatory. The spectra show absorption and emission features of the vibration-rotation bands of gas-phase CO2, HCN, and C2H2, …
Discovery of Radio/X-Ray/Optical-resolved Supernova Remnants in the Center of the Andromeda Galaxy
Kong, A. K. H.; Garcia, M. R.; Williams, B. F. +2 more
We have detected a spatially resolved supernova remnant (SNR) in the center of the Andromeda galaxy, in radio, X-ray, and optical wavelengths. These observations provide the highest spatial resolution imaging of a radio/X-ray/optical SNR in that galaxy to date. The multiwavelength morphology, radio spectral index, X-ray colors, and narrowband opti…
XMM-Newton observations of ULIRGs: A Compton-thick AGN in IRAS 19254-7245
Cappi, M.; Franceschini, A.; Malaguti, G. +8 more
We present the XMM-Newton observation of the merging system IRAS 19254-7245, also known as The Superantennae, whose southern nucleus is classified as a Seyfert 2 galaxy. The XMM-Newton data have allowed us to perform a detailed X-ray imaging and spectral analysis of this system. We clearly detect, for the first time in this system, a strong (EW \s…
XMM-Newton observation of the galactic centre - evidence against the X-ray reflection nebulae model?
Costantini, E.; Hasinger, G.; Predehl, P. +1 more
We present preliminary results of a 50 ksec \XMM observation of the Galactic Centre. Due to the excellent spectral resolution of \XMM combined with its high throughput at energies even beyond 7 keV, the iron line complex could be resolved into individual components (neutral, ionized, both in Kalpha and Kbeta ) in the spectra of a number of sources…
Photometric mapping with ISOPHOT using the ``P32'' Astronomical Observation Template
Gabriel, C.; Tuffs, R. J.
The ``P32'' Astronomical Observation Template (AOT) provided a means to map large areas of sky (up to 45x 45 arcmin) in the far-infrared (FIR) at high redundancy and with sampling close to the Nyquist limit using the ISOPHOT C100 (3x 3) and C200 (2x 2) detector arrays on board the Infrared Space Observatory (ISO). However, the transient response b…
Optical identification of the companion to PSR J1911-5958A, the pulsar binary in the outskirts of NGC 6752
van Kerkwijk, M. H.; Verbunt, F.; Bassa, C. G. +1 more
We report on the identification of the optical counterpart of the binary millisecond pulsar PSR J1911-5958A, located in the outskirts of the globular cluster NGC 6752. At the position of the pulsar we find an object with V=22.08, B-V=0.38, U-B=-0.49. The object is blue with respect to the cluster main sequence by 0.8 mag in B-V. We argue that the …
The identification of HCN and HNC in carbon stars: model atmospheres, synthetic spectra and fits to observations in the 2.7-4.0 µm region
Jones, H. R. A.; Tennyson, J.; Pavlenko, Ya. V. +1 more
Model carbon star atmospheres and synthetic spectra have been calculated using the recent HCN/HNC vibration rotation line list of Harris et al. The calculations are repeated using only HCN lines and show that HNC has a significant effect upon the temperature, density and optical depth of a stellar atmosphere.
We fit synthetic spectra in the 2…
Hard X-ray timing and spectral properties of PSR B0540-69
de Plaa, J.; Kuiper, L.; Hermsen, W.
We report the hard X-ray properties of the young Crab-like LMC pulsar
Formation of Minor-Ion Charge States in the Fast Solar Wind: Roles of Differential Flow Speeds of Ions of the Same Element
Chen, Y.; Hu, Y.; Esser, R.
To investigate the possibility of differential flow speeds between ions of the same element and their roles in the determination of ionic fractions, this paper extends our latest minor-ion model to a five-fluid model, describing the behavior of five species of minor ions of one given element in the fast solar wind. We solve the five sets of mass, …