Search Publications
Are there Kronian electrons in the inner heliosphere?
Fichtner, H.; Lange, D.
Context: As the largest in our solar system the Jovian magnetosphere is treated in the literature as the dominant source of a few-MeV electrons, which have been measured by various spacecraft. In particular, observations obtained with Ulysses have significantly broadened the available data base.
Aims: We simulated the transports of MeV electro…
On the Doppler navigation of a small body orbiter: Rosetta
Mysen, E.; Aksnes, K.
In 2014 the ESA probe Rosetta is to rendezvous with short-period comet 67P/Churyumov-Gerasimenko, where it will be inserted into a stable bound orbit. Partly by measuring the Doppler displacements of the probe's radio carrier waves, the gravity field of the comet's nucleus will be found. In this work, navigation strategies are developed, and impor…
XMMU J134736.6+173403: an eclipsing LMXB in quiescence or a peculiar AGN?
Altieri, B.; King, A. R.; Nucita, A. +2 more
Aims:We report the discovery of a peculiar object observed serendipitously with XMM-Newton. We present its timing and spectral properties and investigate its optical counterpart.
Methods: The light curve of the X-ray source, its spectrum, and the spectrum of the best optical counterpart are presented and analyzed.
Results: The X-ray flux d…
A solar eruption triggered by merge interactions of different helicity loops
Shen, F.; Song, W.; Feng, X.
Aims: We investigate the magnetic evolution of a flare/CME source region to determine the trigger of the flare and the EUV brightening event. Also, we discuss the role of the current helicity (h_c) in solar activity.
Methods: We use the long duration sequences of SOHO/MDI magnetograms and TRACE 195 Å images for a super active region (AR), NOAA…
BVRI photometric analysis for the galaxy group NGC 4410
Meaburn, J.; Katsiyannis, A. C.; Khosroshahi, H. G. +4 more
We present a BVRI CCD (Charge Coupled Device) surface photometry analysis of the galaxy group NGC 4410, which contains four galaxies in interaction. Along with our photometric study, we show residual images (after subtracting isophotal models) and unsharp masked images to uncover any hidden structures in this system of galaxies; we have also perfo…
Large-scale disturbances preceding a fast halo CME
Zong, W. -G.
Aims:The nature of coronal waves, often termed “EIT waves” is still unclear. Therefore new efforts are needed to investigate large-scale disturbances during solar eruptions. In this paper, we present observations of an event occurring on 19 January 2005, and study the large-scale disturbance during the event in detail.
Methods: Using the high …
A peculiar object in M 51: fuzzy star cluster or a background galaxy?
Larsen, S. S.; Anders, P.; Lamers, H. J. G. L. M. +1 more
Aims: We study a peculiar object with a projected position close to the nucleus of M 51. It is unusually large for a star cluster in M 51 and we therefore investigate the three most likely options to explain this object: (a) a background galaxy, (b) a cluster in the disk of M 51 and (c) a cluster in M 51, but in front of the disk.
Methods: We …
Discovery of X-ray emission from the eclipsing brown-dwarf binary 2MASS J05352184-0546085
Schmitt, J. H. M. M.; Czesla, S.; Schneider, P. C.
The eclipsing brown-dwarf binary system 2MASS J05352184-0546085 is a case sui generis. For the first time, it allows a detailed analysis of the individual properties of young brown dwarfs, in particular, masses, and radii, and the temperature ratio of the system components can be determined accurately. The system shows a “temperature reversal" wit…
Validation of the new Hipparcos reduction
van Leeuwen, F.
Context: A new reduction of the astrometric data as produced by the Hipparcos mission has been published, claiming accuracies for nearly all stars brighter than magnitude Hp=8 to be better, by up to a factor 4, than in the original catalogue.
Aims: The new Hipparcos astrometric catalogue is checked for the quality of the data and the consisten…
The reversal of the star formation-density relation in the distant universe
Daddi, E.; Elbaz, D.; Popesso, P. +11 more
Aims:We study the relationship between the local environment of galaxies and their star formation rate (SFR) in the Great Observatories Origins Deep Survey, GOODS, at z∼1.
Methods: We use ultradeep imaging at 24 µm with the MIPS camera onboard {Spitzer} to determine the contribution of obscured light to the SFR of galaxies over the redsh…