Search Publications
The Input Catalogue for the OMC camera onboard INTEGRAL
Mas-Hesse, J. M.; Jordi, C.; Figueras, F. +6 more
The Optical Monitoring Camera (OMC) onboard INTEGRAL (launched on October 17, 2002) has been designed to obtain V-Johnson photometry simultaneously with high energy observations at X-ray (3-35 keV) and gamma-ray (15 keV-10 MeV) performed by the main instruments onboard INTEGRAL. Due to technical limitations on the data processing electronics and t…
Coronal mass ejection interaction and particle acceleration during the 2001 April 14 15 events
Kaiser, M. L.; Howard, R. A.; Gopalswamy, N. +1 more
Two successive solar energetic particle (SEP) events associated with fast and wide coronal mass ejections (CMEs) on 2001 April 14 and 15 are compared. The weak SEP event of April 14 associated with an 830 km/s CME and an M1.0 flare was the largest impulsive event of cycle 23. The April 15 event, the largest ground level event of cycle 23, was thre…
A high-resolution radio study of neutral gas in the starburst galaxy NGC 520
Beswick, R. J.; Pedlar, A.; Clemens, M. S. +1 more
We present subarcsec angular resolution observations of the neutral gas in the nearby starburst galaxy NGC 520. The central kpc region of NGC 520 contains an area of significantly enhanced star formation. The radio continuum structure of this region resolves into ~10 continuum components. By comparing the flux densities of the brightest of these c…
2D MHD modelling of compressible and heated coronal loops obtained via nonlinear separation of variables and compared to TRACE and SoHO observations
Gontikakis, C.; Tsinganos, K.; Aschwanden, M. J. +2 more
An analytical MHD model of coronal loops with compressible flows and including heating is compared to observational data. The model is constructed via a systematic nonlinear separation of the variables method used to calculate several classes of exact MHD equilibria in Cartesian geometry and uniform gravity. By choosing a particularly versatile so…
Variability of The Old Nova V603 Aquilae in UV and X-ray bands
Szkody, P.; Schwarzenberg-Czerny, A.; Borczyk, W.
We present the results of a campaign of simultaneous observations of V603 Aql in the X-ray and UV bands accomplished with the IUE and ROSAT satellites. Simultaneous observations cover 20 orbital cycles, while the total span of all the observations is 40 cycles. This constitutes the longest continuous UV time series of simultaneous space observatio…
Atomic Data and Spectral Line Intensities for S X
Bhatia, A. K.; Landi, E.
Electron impact collision strengths, energy levels, oscillator strengths and spontaneous radiative decay rates are calculated for S X. The configurations included are 2s22p3, 2s2p4, 2p5, 2s22p23s, 2s22p23p, and 2s22p23d giving rise to 72 f…
The microwave subsecond pulse of September 17, 2001: The spectrum, location and size of the source
Yan, Yihua; Altyntsev, A. T.; Meshalkina, N. S. +2 more
We examine simultaneous observations of microwave subsecond pulses with high temporal, spatial and spectral resolution from the Siberian Solar Radio Telescope (5.7 GHz, 14 ms resolution) and from the spectropolarimeters (5.2-7.6 GHz, 6 ms) of the National Astronomical Observatories. The September 17, 2001 flare is discussed in detail. The subsecon…
An upper limit of the number and energy of electrons accelerated at an extended coronal shock wave
Klein, K. -L.; Lecacheux, A.; McTiernan, J. M. +3 more
Type II radio emission is the most direct signature of extended shock waves in the solar corona, and a prime example of electron acceleration at a shock. Yet, the energetics of these electrons is poorly known. On 1996 August 19 and 1997 October 07 type II bursts were observed in association with flares behind the solar limb. While Earth-orbiting X…
On the Distance to Nearby Dwarf Galaxy NGC 1569
Karachentsev, I. D.; Makarova, L. N.
We present stellar photometry of two HST/WFPC2 fields situated at the far periphery of the poststarburst galaxy NGC 1569. Their F606W and F814W images have been taken from the HST data archive. Judging by the obtained color-magnitude diagrams, we suggest presence of the old disk population (old red giants) of NGC 1569, which extends as far as Fiel…
Diffuse continuum emission from the inner Galaxy: First results from INTEGRAL/SPI
Strong, A. W.; Bouchet, L.; Schönfelder, V. +3 more
We present a preliminary analysis of the diffuse hard X- and soft gamma -ray continuum emission from the inner Galactic ridge using INTEGRAL/SPI data from the first Galactic Plane Deep Exposure and Galactic Plane Scans. The spectrum is consistent with results from previous experiments. These early results demonstrate the potential of the INTEGRAL …