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Kinematics of coronal mass ejections between 2 and 30 solar radii. What can be learned about forces governing the eruption?
Vršnak, B.; Gopalswamy, N.; Sudar, D. +1 more
Kinematics of more than 5000 coronal mass ejections (CMEs) measured in the distance range 2-30 solar radii is investigated. A distinct anticorrelation between the acceleration, a, and the velocity, v, is found. In the linear form, it can be represented as a=-k1(v-v0), where v0=400 km s-1, i.e., most of C…
The distance to the giant elliptical galaxy NGC 5128
Rejkuba, M.
The distance to NGC 5128, the central galaxy of the Centaurus group and the nearest giant elliptical to us, has been determined using two independent distance indicators: the Mira period-luminosity (PL) relation and the luminosity of the tip of the red giant branch (RGB). The data were taken at two different locations in the halo of NGC 5128 with …
XMM-Newton observations of the supernova remnant RX J1713.7-3946 and its central source
Ballet, J.; Decourchelle, A.; Giacani, E. +3 more
We present new results from the observations of the supernova remnant (SNR)
Dynamics of solar coronal loops. II. Catastrophic cooling and high-speed downflows
Peter, H.; Hansteen, V. H.; Müller, D. A. N.
This work addresses the problem of plasma condensation and ``catastrophic cooling'' in solar coronal loops. We have carried out numerical calculations of coronal loops and find several classes of time-dependent solutions (static, periodic, irregular), depending on the spatial distribution of a temporally constant energy deposition in the loop. Dyn…
The nature of the Galactic Center source IRS 13 revealed by high spatial resolution in the infrared
Rigaut, F.; Paumard, T.; Stolovy, S. R. +1 more
High spatial resolution observations in the 1 to 3.5 µm/ region of the Galactic Center source known historically as
Abundances of Na, Mg and Al in nearby metal-poor stars
Zhao, G.; Liang, Y. C.; Shi, J. R. +2 more
To determine the population membership of nearby stars we explore abundance results obtained for the light neutron-rich elements 23Na and 27 Al in a small sample of moderately metal-poor stars. Spectroscopic observations are limited to the solar neighbourhood so that gravities can be determined from HIPPARCOS parallaxes, and …
Band-splitting of coronal and interplanetary type II bursts. III. Physical conditions in the upper corona and interplanetary space
Magdalenić, J.; Vršnak, B.; Zlobec, P.
We analyse properties of 58 type II radio bursts recorded in the meter-to-kilometer wavelength range, focusing on episodes of band-split emission. The basic two parameters utilized are the frequency drift Df=df/dt and the relative band-split BDW=Δ f/f of type II burst emission lanes. On average, in the meter-to-kilometer wavelength rang…
Mid-infrared emission of galactic nuclei. TIMMI2 versus ISO observations and models
Siebenmorgen, R.; Krügel, E.; Spoon, H. W. W.
We investigate the mid-infrared radiation of galaxies that are powered by a starburst or by an AGN. For this end, we compare the spectra obtained at different spatial scales in a sample of infrared bright galaxies. ISO observations which include emission of the nucleus as well as most of the host galaxy are compared with TIMMI2 spectra of the nucl…
Geometry of the non-thermal emission in SN 1006. Azimuthal variations of cosmic-ray acceleration
Ballet, J.; Decourchelle, A.; Ferrando, P. +3 more
Detection of Lyman-α emission from a DLA galaxy: Possible implications for a luminosity-metallicity relation at z = 2-3
Fynbo, J. P. U.; Fall, S. M.; Møller, P.
In an ongoing programme to identify a sample of high z DLA galaxies we have found the long sought for case of a Lyα emitter seen in the centre of a broad DLA trough. This is the predicted ``textbook case'' of an intervening DLA galaxy if DLA galaxies are small, but would not be expected if intervening high redshift DLA galaxies have large gaseous …