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Diagnostics of Titan's stratospheric dynamics using Cassini/CIRS data and the 2-dimensional IPSL circulation model
Teanby, N. A.; Bézard, B.; Lebonnois, S. +6 more
The dynamics of Titan's stratosphere is discussed in this study, based on a comparison between observations by the CIRS instrument on board the Cassini spacecraft, and results of the 2-dimensional circulation model developed at the Institute Pierre-Simon Laplace, available at http://www.lmd.jussieu.fr/titanDbase [Rannou, P., Lebonnois, S., Hourdin…
Low-Level Nuclear Activity in Nearby Spiral Galaxies
Fiore, Fabrizio; Mathur, Smita; Ferrarese, Laura +1 more
We are conducting a search for supermassive black holes (SMBHs) with masses below ~107 M⊙ by looking for signs of extremely low-level nuclear activity in nearby galaxies that are not known to be AGNs. Our survey has the following characteristics: (1) X-ray selection using the Chandra X-Ray Observatory, since X-rays are a ubiq…
Ferric oxides in East Candor Chasma, Valles Marineris (Mars) inferred from analysis of OMEGA/Mars Express data: Identification and geological interpretation
Sotin, Christophe; Le Mouélic, Stéphane; Gendrin, Aline +7 more
The mineralogical composition of the Martian surface is constrained by analyzing the data of the OMEGA visible and near infrared imaging spectrometer onboard Mars Express. Ferric signatures had previously been reported in Valles Marineris, Margaritifer Terra, and Terra Meridiani. Here we use three independent data reduction methods (Spectral Angle…
Structure and density of cometary nuclei
Weissman, Paul R.; Lowry, Stephen C.
Understanding the nature of the cometary nucleus remains one of the major problems in solar system science. Whipple’s (1950) icy conglomerate model has been very successful at explaining a range of cometary phenomena, including the source of cometary activity and the nongravitational orbital motion of the nuclei. However, the internal structure of…
VLBI Astrometry of AGB Variables with VERA --- A Semiregular Variable S Crateris ---
Hirota, Tomoya; Kurayama, Tomoharu; Honma, Mareki +40 more
We present a distance measurement for the semiregular variable S Crateris (S Crt) based on its annual parallax. With the unique dual beam system of the VLBI Exploration for Radio Astrometry (VERA) telescopes, we measured the absolute proper motion of a water maser spot associated with S Crt, referred to the quasar J1147-0724 located at an angular …
VLT Spectroscopy of Globular Clusters in Low Surface Brightness Dwarf Galaxies
Puzia, Thomas H.; Sharina, Margarita E.
We present VLT/FORS2 spectroscopic observations of globular clusters (GCs) in five low surface brightness dwarf galaxies: KK 211 and KK 221, both dwarf spheroidal satellites (dSph) of NGC 5128; dSph KK 84 located close to the isolated S0 galaxy NGC 3115; and two isolated dwarf irregular (dIrr) galaxies, UGC 3755 and ESO 490-17. Our sample is selec…
Infrared (0.83 5.1 µm) photometry of Phoebe from the Cassini Visual Infrared Mapping Spectrometer
Brown, R. H.; Buratti, B. J.; Clark, R. N. +8 more
Three weeks prior to the commencement of Cassini's 4 year tour of the saturnian system, the spacecraft executed a close flyby of the outer satellite Phoebe. The infrared channel of the Visual Infrared Mapping Spectrometer (VIMS) obtained images of reflected light over the 0.83-5.1 µm spectral range with an average spectral resolution of 16.5…
Hubble Space Telescope Spectroscopic Observations of the Narrow-Line Region in Nearby Low-Luminosity Active Galactic Nuclei
Filippenko, Alexei V.; Ho, Luis C.; Shields, Joseph C. +5 more
We present Space Telescope Imaging Spectrograph observations of 14 nearby low-luminosity active galactic nuclei, including 13 LINERs and 1 Seyfert, taken at multiple parallel slit positions centered on the galaxy nuclei and covering the Hα spectral region. For each galaxy, we measure the emission-line velocities, line widths, and strengths to map …
Self-Regulated Fueling of Galaxy Centers: Evidence for Star Formation Feedback in IC 342's Nucleus
Meier, David S.; Böker, Torsten; Calzetti, Daniela +1 more
Using new, high-resolution interferometric observations of the CO and HCN molecules, we directly compare the molecular and ionized components of the interstellar medium in the center of the nearby spiral galaxy IC 342, on spatial scales of ≈10 pc. The morphology of the tracers suggests that the molecular gas flow caused by a large-scale stellar ba…
The Solar Magnetic Field and Coronal Dynamics of the Eruption on 2007 May 19
Luhmann, J. G.; Li, Y.; Lynch, B. J. +5 more
The solar eruption on 2007 May 19, from AR 10956 near solar disk center, consisted of a B9.5 flare (12:48 UT), a filament eruption, an EUV dimming, a coronal wave, and a multifront CME. The eruption was observed by the twin STEREO spacecraft at a separation angle of 8.5°. We report analysis of the source region photospheric magnetic field and its …