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Color, Structure, and Star Formation History of Dwarf Galaxies over the Last ~3 Gyr with GEMS and SDSS
Bell, Eric F.; Wolf, Christian; Rix, Hans-Walter +7 more
We present a study of the colors, structural properties, and star formation histories for a sample of ~1600 dwarfs over look-back times of ~3 Gyr (z=0.002-0.25). The sample consists of 401 distant dwarfs drawn from the Galaxy Evolution from Morphologies and SEDs (GEMS) survey, which provides high-resolution Hubble Space Telescope (HST) Advanced Ca…
The Deuterium, Oxygen, and Nitrogen Abundance toward LSE 44
Sembach, K. R.; Chayer, P.; Hébrard, G. +2 more
We present measurements of the column densities of interstellar D I, O I, N I, and H2 made with the Far Ultraviolet Spectroscopic Explorer (FUSE) and of H I made with the International Ultraviolet Explorer (IUE) toward the sdO star LSE 44 [(l, b)=(313.37d, +13.49d) d=554+/-66 pc; z=+129+/-15 pc]. This target is among the seven most dist…
Titan's bright spots: Multiband spectroscopic measurement of surface diversity and hazes
Genzel, R.; Eisenhauer, F.; de Pater, I. +3 more
Spatially resolved near-infrared spectra of Titan, which simultaneously cover two CH4 absorption bands (from 1.45 to 2.45 µm), have been obtained using the SINFONI integral-field spectrometer with adaptive optics at the Very Large Telescope (VLT) of the European Southern Observatory. We observe the enhancement in 2 µm surfac…
Possible remnants of a frozen mud lake in southern Elysium, Mars
Smith, Michael D.; Markiewicz, Wojciech J.; Page, David +2 more
In this work we estimate the minimum persistence time of subsurface ice in water rich sediment layers remaining after sublimation of a martian lake. We simulate sublimation of ice from layers of different granulations and thicknesses. Presented results assume insolation and atmospheric conditions characteristic for the present day southern Elysium…
Red active galactic nuclei in XMM-Newton/Sloan Digital Sky Survey fields
Georgantopoulos, I.; Akylas, A.; Georgakakis, A. E.
In this paper we combine archival and proprietary XMM-Newton observations (about 5deg2) that overlap with the Sloan Digital Sky Survey to explore the nature of the moderate-z X-ray population. We focus on X-ray sources with optically red colours (g - r > 0.4), which we argue are important for understanding the origin of the X-ray bac…
Non-gravitational motion of the Jupiter-family comet 81P/Wild 2. I. The dynamical evolution
Szutowicz, S.; Królikowska, M.
We investigated the influence of the non-gravitational effects on the orbital motion of 81P/Wild 2. First, the non-gravitational accelerations on cometary nucleus throughout all five revolutions around the sun were analysed using both the symmetrical and the asymmetrical g(r)-function. Next, the symmetric model was used to examine the past and fut…
CCD astrometric observations of Phoebe in 2003-2004
Qiao, R. C.; Yu, Y.; Shen, K. X. +5 more
In 2003-2004, we obtained 115 new observations of Phoebe, the 9th Saturnian faint satellite (visual magnitude of about 16.5). We used a large CCD detector (2048×2048 pixels) mounted on the 1.56 m astrometric reflector at the Sheshan Station, near Shanghai. In our reduction, an up-to-date catalogue of stars, UCAC2 (Zacharias et al. 2004), was chose…
The ultra-compact binary 4U 1850-087 observed with INTEGRAL: hard X-ray emission from an X-ray burster
Mereghetti, S.; Sidoli, L.; Bazzano, A. +1 more
Context: .The X-ray burster 4U 1850-087, located in the Galactic globular cluster NGC 6712, is an ultracompact binary (orbital period ~21 min), likely harbouring a degenerate companion.
Aims: .The source has been observed at soft γ-rays several times with the INTEGRAL satellite, during the monitoring of the Galactic plane, with an unprecedente…
New Corroborative Evidence for the Overdensity of Galaxies around the Radio-Loud Quasar SDSS J0836+0054 at z = 5.8
Nagao, Tohru; Taniguchi, Yoshiaki; Ajiki, Masaru +8 more
Recently, Zheng et al. (2006) found evidence for an overdensity of galaxies around a radio-loud quasar, SDSS J0836+0054, at z = 5.8 (a 5 arcmin² field). We examined our deep optical imaging data (B, V, r', i', z', and NB816) taken with the Suprime-Cam on the Subaru Telescope. The NB816 narrow-band filter (λc = 815 and Δλ = 12nm) is suit…
Nonequilibrium radiative heat flux modeling for the Huygens entry probe
Magin, T. E.; Caillault, L.; Bourdon, A. +1 more
An electronic collisional-radiative model is proposed to predict the nonequilibrium populations and the radiation of the excited electronic states CN(A, B) and N2(A, B, C) during the entry of the Huygens probe into the atmosphere of Titan. The model is loosely coupled with flow solvers using a Lagrangian method. First, the model was tes…