Search Publications
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…
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…
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 …
Inversion of the intensity-magnetic field relationship in solar active regions
Fludra, A.; Ireland, J.
We discuss the relationship between the EUV spectral line intensities and the photospheric magnetic flux in solar active regions. Since the histograms of the magnetic flux density in active region plages can be approximated by an exponential function, the equation describing how the observed total line intensity integrated over an active region ar…
[C II] emission and star formation in late-type galaxies. II. A model
Völk, H. J.; Pierini, D.; Leech, K. J.
We study the relationship between gas cooling via the [C II] (lambda = 158 µm) line emission and dust cooling via the far-IR continuum emission on the global scale of a galaxy in normal (i.e. non-AGN dominated and non-starburst) late-type systems. It is known that the luminosity ratio of total gas and dust cooling, LC II/ LFI…
On the origin of microwave type U-bursts
Kuznetsov, A. A.; Altyntsev, A. T.; Meshalkina, N. S. +1 more
An analysis is made of the observations of U-type cm-bursts recorded simultaneously with high spatial (Siberian solar radio telescope) and spectral resolution (National Astronomical Observatories/Beijing spectropolarimeters). It is shown that the source positions of increasing and decreasing branches of the U-burst coincide within a few arcsec. Th…
An outflow from the nebula around the LBV candidate S 119
Weis, K.; Bomans, D. J.; Duschl, W. J.
We present an analysis of the kinematic and morphological structure of the nebula around the LMC LBV candidate S 119. On HST images, we find a predominantly spherical nebula which, however, seems to be much better confined in its eastern hemisphere than in the western one. The filamentary western part of the nebula is indicative of matter flowing …
The radial velocity curve of HD 153919 (4U 1700-37) revisited
van Kerkwijk, M. H.; Hammerschlag-Hensberge, G.; Kaper, L.
We have re-analysed all available high-resolution ultraviolet IUE spectra of the high-mass X-ray binary HD 153919/4U 1700-37. The radial velocity semi-amplitude of 20.6 +/- 1.0 km s-1 and orbital eccentricity of 0.22 +/- 0.04 agree very well with the values obtained earlier from optical spectra. They disagree with earlier conclusions fo…
Modeling far-infrared line emission from the HII region S125
Emery, R. J.; Aannestad, P. A.
We present ISO-LWS spectral line observations of the [OI] 63 and 146 mu m lines, the [CII] 158 mu m line, and the [NII] 122 mu m line at 17 positions in the HII region S125. We model this emission by a two-dimensional geometrical blister model, utilizing the parameters derived from our previous modeling of the HII, HI and FIR dust emission in this…