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Comparisons between Isothermal and NFW Mass Profiles for Strong-Lensing Galaxy Clusters
Huang, J. -S.; Mellier, Yannick; Bartelmann, Matthias +3 more
While both isothermal and NFW-based mass models for galaxy clusters are widely adopted in strong-lensing studies, they cannot easily be distinguished based solely on observed positions of arcs and arclets. We compare the magnifications predicted for giant arcs obtained from isothermal and NFW profiles, taking axially symmetric and asymmetric mass …
Embedded clusters in NGC 1808 central starburst. Near-infrared imaging and spectroscopy
Alloin, D.; Galliano, E.
Context: In the course of a mid-infrared imaging campaign of close-by active galaxies, we discovered the mid-infrared counterparts of bright compact radio sources in the central star-forming region of NGC 1808.
Aims: We aim at confirming that these sources are deeply embedded, young star clusters and at deriving some of their intrinsic propert…
Imaging ejecta from the final flash star V605 Aquilae
Lebzelter, T.; Hinkle, K. H.; Joyce, R. R. +4 more
Aims:We investigated the cloud of ejecta resulting from the mass loss associated with the final helium shell flash in V605 Aql.
Methods: V605 Aql was imaged at high spatial resolution in both optical emission lines and the infrared continuum using HST/WFPC2 and Gemini/Hokupa'a+QUIRC, respectively. The He I 10 830 Å spectrum was also observed. …
Identification of Saturn's magnetospheric regions and associated plasma processes: Synopsis of Cassini observations during orbit insertion
Schippers, P.; André, N.; Gurnett, D. A. +29 more
Saturn's magnetosphere is currently studied from the microphysical to the global scale by the Cassini-Huygens mission. During the first half of 2004, in the approach phase, remote sensing observations of Saturn's magnetosphere gave access to its auroral, radio, UV, energetic neutral atom, and dust emissions. Then, on 1 July 2004, Cassini Saturn or…
The corona and upper transition region of epsilon Eridani
Ness, J. -U.; Jordan, C.
We present analyses of observations of epsilon Eridani (K2 V) made with the Low Energy Transmission Grating Spectrometer onboard Chandra and the Extreme Ultraviolet Explorer, supplemented by observations made with the Space Telescope Imaging Spectrograph, the Far Ultraviolet Spectroscopic Explorer and the Reflection Grating Spectrometer onboard XM…
First observation of 628 CO 2 isotopologue band at 3.3 µm in the atmosphere of Venus by solar occultation from Venus Express
Bertaux, Jean-Loup; Vandaele, Ann Carine; Montmessin, F. +5 more
The new ESA Venus Express orbiter is the first mission applying the probing technique of solar and stellar occultation to the atmosphere of Venus, with the SPICAV/SOIR instrument. SOIR is a new type of spectrometer used for solar occultations in the range 2.2-4.3 µm. Thanks to a high spectral resolving power R∼15,000-20,000 (unprecedented in…
Retreat and reformation of X-line during quasi-continuous tailward-of-the-cusp reconnection under northward IMF
Khotyaintsev, Y.; Vaivads, A.; Hasegawa, H. +6 more
We present observations on 19-20 November 2006 by the Cluster spacecraft that were skimming the high-latitude dusk-flank magnetopause, which are consistent with more than one reconnection X-line present on the tailward side of the cusp under northward IMF. Evidence of quasi-continuous reconnection over 16 hours exists in the form of Alfvénic accel…
Large-scale horizontal flows in the solar photosphere. III. Effects on filament destabilization
Bommier, V.; Schmieder, B.; Rondi, S. +7 more
Aims:We study the influence of large-scale photospheric motions on the destabilization of an eruptive filament, observed on October 6, 7, and 8, 2004, as part of an international observing campaign (JOP 178).
Methods: Large-scale horizontal flows were investigated from a series of MDI full-disc Dopplergrams and magnetograms. From the Dopplergr…
Suzaku X-Ray Spectroscopy of a Peculiar Hot Star in the Galactic Center Region
Nagata, Tetsuya; Tsujimoto, Masahiro; Koyama, Katsuji +5 more
We present the results of a Suzaku study of a bright point-like source in the 6.7keV intensity map of the Galactic center region. We detected an intense FeXXV 6.7keV line with an equivalent width of ∼1keV as well as emission lines of highly ionized Ar and Ca from a spectrum obtained by the X-ray Imaging Spectrometer. The overall spectrum is descri…
Keck spectroscopy of globular clusters in the spiral galaxy NGC 2683
Forbes, Duncan A.; Brodie, Jean P.; Strader, Jay +1 more
We analyse Keck spectra of 24 candidate globular clusters (GCs) associated with the spiral galaxy NGC 2683. We identify 19 bona fide GCs based on their recession velocities, of which 15 were suitable for stellar population analysis. Age and metallicity determinations reveal old ages in 14 out of 15 GCs. These old GCs exhibit age and metallicity di…