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Determination of the microbial diversity of spacecraft assembly, testing and launch facilities: First results of the ESA project MiDiv
Rettberg, P.; Fritze, D.; Verbarg, S. +4 more
In the near future, an increasing number of in situ life detection and sample return missions to planets and other solar system bodies will be launched. The demand to control spacecraft-carried microbial contamination becomes obvious. COSPAR (Committee of Space Research) has defined guidelines and bioburden limits for different types of missions a…
Line formation regions of the UV spectrum of C I Cygni
Friedjung, M.; Mikołajewska, J.; Quiroga, C.
Aims.They are the interpretation of the emission line formation regions in
Methods: .They involve the examination of radial velocities and fluxes of ultraviolet emission lines at different epochs, deduced from archival IUE and GRHS/HST spectra.
Results: .The line fluxes give electron densities and were in additi…
Faint U-Band Dropouts in the WFPC2 Parallels of the Hubble Ultra Deep Field
Casertano, Stefano; de Mello, Duilia; Wadadekar, Yogesh
We combine data from the extremely deep Hubble Space Telescope U (F300W) image, obtained using WFPC2 as part of the parallel observations of the Hubble Ultra Deep Field campaign, with BVi images from the Great Observatories Origins Deep Survey to identify a sample of Lyman break galaxies in the redshift range 2.0<~z<~3.5. We use recent stell…
Evidence of standing waves during a Pi2 pulsation event observed on Cluster
Blomberg, L. G.; Collier, A. B.; Hughes, A. R. W. +1 more
Observations of Pi2 pulsations at middle and low latitudes have been explained in terms of cavity mode resonances, whereas transients associated with field-aligned currents appear to be responsible for the high latitude Pi2 signature. Data from Cluster are used to study a Pi2 event observed at 18:09 UTC on 21 January 2003, when three of the satell…
Spitzer observations of red galaxies: Implication for high-redshift star formation
Papovich, Casey
My colleagues and I identified distant red galaxies (DRGs) with J - Ks > 2.3 in the southern Great Observatories Origins Deep Surveys (GOODS-S) field. These galaxies reside at z ∼ 1-3.5, (< z> ≃ 2.2) and based on their ACS (0.4-1 µm), ISAAC (1-2.2 µm), and IRAC (3-8 µm) photometry, they typically have stellar …
Simulation of the Cluster-Spacecraft Floating Probe Potential
Escoubet, C. P.; Masson, A.; Laakso, H. +2 more
Saturn's Icy Moon Rhea: A Prediction for its Bulk Chemical Composition and Physical Structure at the Time of the Cassini Spacecraft First Flyby
Prentice, Andrew J. R.
I report a model for the formation of Saturn's family of mid-sized icy moons to coincide with the first flypast of Rhea by the Cassini spacecraft on 2005 November 26. It is proposed that the moons had condensed from a concentric family of orbiting gas rings that were shed some 4.6 × 109 yr ago by the proto-Saturnian (hereafter p-Sat) cl…
Shock excitation of the knots of Hen 3-1475
Binette, L.; Raga, A. C.; Riera, A.
We present new optical STIS HST spectroscopic observations of the jets of the proto-planetary nebula Hen3-1475. The excitation conditions of the knots of Hen3-1475
are derived from the observed optical spectra, confirming that the knots are shock excited. The shocked spectra are qualitatively reproduced by simple "3/2"Dbow shock models. …APEX blind deconvolution of color Hubble space telescope imagery and other astronomical data
Carasso, Alfred S.
Photometric properties of Titan's surface from Cassini VIMS: Relevance to titan's hemispherical albedo dichotomy and surface stability
Sotin, C.; Brown, R. H.; Baines, K. H. +24 more
The Visual and Infrared Mapping Spectrometer (VIMS) instrument on the Cassini Saturn Orbiter returned spectral imaging data as the spacecraft undertook six close encounters with Titan beginning 7 July, 2004. Three of these flybys each produced overlapping coverage of two distinct regions of Titan's surface. Twenty-four points were selected on appr…