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Optical and OH megamaser observations of the starburst galaxy IIZw 096
Klöckner, H. -R.; Plauchu-Frayn, I.; Coziol, R. +4 more
Using the Multi-Element Radio-Linked Interferometer Network (MERLIN), we have acquired a high spatial resolution spectral image of the OH megamaser (OHMM) in the nearby starburst 'galaxy' known as IIZw 096. We have also acquired optical B, V, R, I and Hα images with the 1.5-m telescope in San Pedro Mártir. By comparing the MERLIN observations with…
The 17 January 2005 Complex Solar Radio Event Associated with Interacting Fast Coronal Mass Ejections
Klein, K. -L.; Hillaris, A.; Malandraki, O. +6 more
On 17 January 2005 two fast coronal mass ejections were recorded in close succession during two distinct episodes of a 3B/X3.8 flare. Both were accompanied by metre-to-kilometre type-III groups tracing energetic electrons that escape into the interplanetary space and by decametre-to-hectometre type-II bursts attributed to CME-driven shock waves. A…
Motion of blocks on the surface of Phobos: New constraints for the formation of grooves
Hamelin, Michel
Although grooves are common on asteroids, on Phobos the grooves have been the subject of various formation hypotheses for two reasons: the fact that Phobos is orbiting around Mars close to the Roche limit, implies an unusual gravity environment as well as the presence of the huge crater impact, Stickney, which seems to be related at least to a fam…
Observation and modelling of main-sequence star chromospheres - XVI. Rotation of dK5 stars
Houdebine, E. R.
Using two different spectrographs, High Accuracy Radial velocity Planet Search (HARPS) (European Southern Observatory) and SOPHIE (Observatoire de Haute Provence), we have measured v sin i for a sample of dK5 stars. These are the first measurements of v sin i for most of the stars studied here.
We measured v sin i to an accuracy of 0.3 km sProbing the nature of short swift bursts via deep INTEGRAL monitoring of GRB 050925
Sakamoto, T.; Gehrels, N.; Cummings, J. R. +10 more
We present results from Swift, XMM-Newton, and deep INTEGRAL monitoring in the region of GRB 050925. This short Swift burst is a candidate for a newly discovered soft gamma-ray repeater (SGR) with the following observational burst properties: (1) galactic plane (b = -0.1°) localization, (2) 150 ms duration, and (3) a blackbody rather than a simple…
A Search for Young Stars in the S0 Galaxies of a Super-group at z = 0.37
Tran, Kim-Vy H.; Moustakas, John; Gonzalez, Anthony H. +3 more
We analyze Galaxy Evolution Explorer UV data for a system of four gravitationally bound groups at z = 0.37, SG1120, which is destined to merge into a Coma-mass cluster by z = 0, to study how galaxy properties may change during cluster assembly. Of the 38 visually classified S0 galaxies, with masses ranging from log (M *)[M sun
Redshifts, Widths, and Radiances of Spectral Lines Emitted by the Solar Transition Region
Doschek, G. A.; Dammasch, I. E.; Feldman, U.
A long-standing problem in understanding the physics of the transition region has been the ubiquitous redshifts of transition region ultraviolet spectral lines relative to chromospheric emission lines, a result known since the Skylab era. Extended spectral scans performed for various regions of the solar disk by the Solar Ultraviolet Measurements …
Six years of XMM-Newton observations of NGC 1313 X-1 and X-2
Pintore, F.; Zampieri, L.
We present a systematic analysis of the X-ray spectra of NGC 1313 X-1 and NGC 1313 X-2, using six years of XMM-Newton observations (17 observations). We fitted the continuum with a Comptonization model plus a multicolor blackbody disc, that describes the effects of an accretion disc plus an optically thick corona. We checked the consistency of thi…
Galactic S Stars: Investigations of Color, Motion, and Spectral Features
Green, Paul J.; Gray, Richard O.; Otto, Elizabeth
Known bright S stars, recognized as such by their enhanced s-process abundances and C/O ratio, are typically members of the asymptotic giant branch (AGB) or the red giant branch. Few modern digital spectra for these objects have been published, from which intermediate resolution spectral indices and classifications could be derived. For published …
The mm-colors of a Young Binary Disk System in the Orion Nebula Cluster
Testi, L.; Williams, J. P.; Ricci, L. +2 more
We present new Expanded Very Large Array (EVLA) continuum observations at 7 mm of the 253-1536 binary disk system in the Orion Nebula Cluster. The measured fluxes were combined with data in the submillimeter to derive the millimeter spectral index of each individual disk component. We show how these observations can be used to test the models of d…