The X-ray variability and the near-IR to X-ray spectral energy distribution of four low luminosity Seyfert 1 galaxiesWe present the results from a study of the X-ray variability and the near-IR to X-ray spectral energy distribution of four low-luminosity, Seyfert 1 galaxies. We compared their variability amplitude…I. E. Papadakis, Z. Ioannou, W. Brinkmann et al.·Sep 10, 2008SaveLearn
Night sky at the Indian Astronomical Observatory during 2000-2008We present an analysis of the optical night sky brightness and extinction coefficient measurements in UBVRI at the Indian Astronomical Observatory (IAO), Hanle, during the period 2003-2008. They are…C. S. Stalin, M. Hegde, D. K. Sahu et al.·Sep 10, 2008SaveLearn
Stellar populations in a standard ISOGAL field in the Galactic diskWe aim to identify the stellar populations (mostly red giants and young stars) detected in the ISOGAL survey at 7 and 15micron towards a field (LN45) in the direction l=-45, b=0.0. The sources…S. Ganesh, A. Omont, U. C. Joshi et al.·Sep 10, 2008SaveLearn
Multiwavelength observations of 3C 454.3. I. The AGILE 2007 November campaign on the "Crazy Diamond"[Abridged] We report on a multiwavelength observation of the blazar 3C 454.3 (which we dubbed "crazy diamond") carried out on November 2007 by means of the astrophysical satellites AGILE,…S. Vercellone, A. W. Chen, V. Vittorini et al.·Sep 10, 2008SaveLearn
Meteorites and the physico-chemical conditions in the early solar nebulaChondritic meteorites constitute the most ancient rock record available in the laboratory to study the formation of the solar system and its planets. Detailed investigations of their mineralogy,…Jerome Aleon·Sep 10, 2008SaveLearn
The angular sizes of dwarf stars and subgiants - Non-linear surface brightness relations in BVRcIc from interferometryContext: The prediction of stellar angular diameters from broadband photometry plays an important role for different applications. In particular, long-baseline interferometry, gravitational…Pierre Kervella, Pascal Fouqué·Sep 10, 2008SaveLearn
Impact of a radius and composition variation on the solar subsurface layers stratificationSeveral works have reported changes of the Sun's subsurface stratification inferred from f-mode or p-mode observations. Recently a non-homologous variation of the subsurface layers with depth and…Sandrine Lefebvre, Phu Anh Phi Nghiem, Sylvaine Turck-Chieze·Sep 10, 2008SaveLearn
Multi-wavelength study of a young open cluster NGC 7419Using UBVRI Halpha CCD photometric observations and the archival NIR and X-ray data, we have carried out a multi-wavelength study of a young star cluster NGC 7419. An age of 22.5+/-3.0 Myr and a…Himali Joshi, Brijesh Kumar, K. P. Singh et al.·Sep 10, 2008SaveLearn
Radiation-Dominated Disks Are Thermally StableWhen the accretion rate is more than a small fraction of Eddington, the inner regions of accretion disks around black holes are expected to be radiation-dominated. However, in the alpha-model, these…Shigenobu Hirose, Julian H. Krolik, Omer Blaes·Sep 10, 2008SaveLearn
Abundances and Isotope Ratios in the Magellanic Clouds: The Star Forming Environment of N113With the goal of deriving the physical and chemical conditions of star forming regions in the Large Magellanic Cloud (LMC), a spectral line survey of the prominent star forming region N113 is…M. Wang, Y. -N. Chin, C. Henkel et al.·Sep 10, 2008SaveLearn
Extremely Anisotropic ScintillationsA small number of quasars exhibit interstellar scintillation on time-scales less than an hour; their scintillation patterns are all known to be anisotropic. Here we consider a totally anisotropic…Mark Walker, Ger de Bruyn, Hayley Bignall·Sep 10, 2008SaveLearn
Stellar Proper Motions in the Galactic Bulge from deep HST ACS/WFC PhotometryWe present stellar proper motions in the Galactic bulge from the Sagittarius Window Eclipsing Extrasolar Search (SWEEPS) project using ACS/WFC on HST. Proper motions are extracted for more than…Will Clarkson, Kailash Sahu, Jay Anderson et al.·Sep 10, 2008SaveLearn
A Simple Quintessence ModelA simple model of quintessential inflation with the modified exponential potential e-αϕ [A+(ϕ-ϕ0)2] is analyzed in the braneworld context. Considering reheating via instant preheating, we…M. C. Bento, R. Gonzalez Felipe, N. M. C. Santos·Sep 10, 2008SaveLearn
Discovery of an Unusual Optical Transient with the Hubble Space TelescopeWe present observations of SCP 06F6, an unusual optical transient discovered during the Hubble Space Telescope Cluster Supernova Survey. The transient brightened over a period of ~100 days, reached a…K. Barbary, K. S. Dawson, K. Tokita et al.·Sep 10, 2008SaveLearn
New Observations and a Possible Detection of Parameter Variations in the Transits of Gliese 436bWe present ground-based observations of the transiting Neptune-mass planet Gl 436b obtained with the 3.5-meter telescope at Apache Point Observatory and other supporting telescopes. Included in this…Jeffrey L. Coughlin, Guy S. Stringfellow, Andrew C. Becker et al.·Sep 9, 2008SaveLearn
Atmospheric Circulation of Hot Jupiters: A Shallow Three-Dimensional ModelRemote observing of exoplanetary atmospheres is now possible, offering us access to circulation regimes unlike any of the familiar Solar System cases. Atmospheric circulation models are being…Kristen Menou, Emily Rauscher·Sep 9, 2008SaveLearn
Search for Point Sources of High Energy Neutrinos with Final Data from AMANDA-IIWe present a search for point sources of high energy neutrinos using 3.8 years of data recorded by AMANDA-II during 2000-2006. After reconstructing muon tracks and applying selection criteria…The IceCube Collaboration·Sep 9, 2008SaveLearn
Water, O2 and Ice in Molecular CloudsWe model the temperature and chemical structure of molecular clouds as a function of depth into the cloud, assuming a cloud of constant density n illuminated by an external FUV (6 eV < E < 13.6 eV)…David Hollenbach, Michael J. Kaufman, Edwin A. Bergin et al.·Sep 9, 2008SaveLearn
Turbulent Convection in Stellar Interiors. II. The Velocity FieldWe analyze stellar convection with the aid of 3D hydrodynamic simulations, introducing the turbulent cascade into our theoretical analysis. We devise closures of the Reynolds-decomposed mean field…David Arnett, Casey Meakin, P. A. Young·Sep 9, 2008SaveLearn
The 5.25 & 5.7 μm Astronomical Polycyclic Aromatic Hydrocarbon Emission FeaturesAstronomical mid-IR spectra show two minor PAH features at 5.25 and 5.7 μm (1905 and 1754 cm - 1) that hitherto have been little studied, but contain information about the astronomical…C. Boersma, A. L. Mattioda, C. W. Bauschlicher et al.·Sep 9, 2008SaveLearn
Cosmic constraints rule out s-wave annihilation of light dark matterLight dark matter annihilating into electron-positron pairs emits a significant amount of internal bremsstrahlung that may contribute to the cosmic gamma-ray background. The amount of emitted…Dominik R. G. Schleicher, Simon C. O. Glover, Robi Banerjee et al.·Sep 9, 2008SaveLearn
Dark stars: Implications and constraints from cosmic reionization and extragalactic background radiationDark stars powered by dark matter annihilation have been proposed as the first luminous sources in the universe. These stars are believed to form in the central dark matter cusp of low-mass…Dominik R. G. Schleicher, Robi Banerjee, Ralf S. Klessen·Sep 9, 2008SaveLearn
Reconstructing the interaction between the dark matter and holographic dark energyWe reconstruct the interaction rate between the dark matter and the holographic dark energy with the parameterized equation of states and the future event horizon as the infrared cut-off length. It…Shao-Feng Wu, Peng-Ming Zhang, Guo-Hong Yang·Sep 9, 2008SaveLearn
Evolved Stars in the Core of the Massive Globular Cluster NGC 2419We present an analysis of optical and ultraviolet Hubble Space Telescope photometry for evolved stars in the core of the distant massive globular cluster NGC 2419. We characterize the horizontal…Eric L. Sandquist, Jordan M. Hess·Sep 9, 2008SaveLearn
Activity induced by Gravitational Interaction in Galaxy PairsA systematic study of the nuclear emission of a sample of 97 spirals in isolated galaxy pairs with mixed morphology (E+S) shows that: 1) AGN activity is found in 40% of the spiral galaxies in these…D. Dultzin, J. J. Gonzalez, Y. Krongold et al.·Sep 9, 2008SaveLearn