Identifying Deficiencies of Standard Accretion Disk Theory: Lessons from a Mean-Field ApproachTurbulent viscosity is frequently used in accretion disk theory to replace the microphysical viscosity in order to accomodate the observational need for in- stabilities in disks that lead to enhanced…Alexander Hubbard, Eric G. Blackman·Aug 25, 2008SaveLearn
Cosmic X-ray background and Earth albedo Spectra with Swift/BATWe use Swift/BAT Earth occultation data at different geomagnetic latitudes to derive a sensitive measurement of the Cosmic X-ray background (CXB) and of the Earth albedo emission in the 15--200 keV…M. Ajello, J. Greiner, G. Sato et al.·Aug 25, 2008SaveLearn
United classification of cosmic gamma-ray bursts and their counterpartsUnited classification of gamma-ray bursts and their counterparts is established on the basis of measured characteristics: photon energy E and emission duration T. The founded interrelation between…Alexander Kuznetsov·Aug 25, 2008SaveLearn
The Corona Australis Star Forming RegionAt a distance of about 130 pc, the Corona Australis molecular cloud complex is one of the nearest regions with ongoing and/or recent star formation. It is a region with highly variable extinction of…Ralph Neuhäuser, Jan Forbrich·Aug 25, 2008SaveLearn
Astrophysical Relevance of Storage-Ring Electron-Ion Recombination ExperimentsThe relevance of storage-ring electron-ion recombination experiments for astrophysics is outlined. In particular, the role of low-energy dielectronic-recombination resonances is discussed. A…S. Schippers·Aug 25, 2008SaveLearn
Young Nearby Loose AssociationsA significant population of stars with ages younger than the Pleiades exists in the solar neighborhood. They are grouped in loose young associations, sharing similar kinematical and physical…Carlos A. O. Torres, Germano R. Quast, Claudio H. F. Melo et al.·Aug 25, 2008SaveLearn
LABOCA observations of nearby, active galaxiesWe present large scale 870 micron maps of the nearby starburst galaxies NGC253, NGC4945 and the nearest giant elliptical radio galaxy Centaurus A (NGC 5128) obtained with the newly commissioned Large…A. Weiss, A. Kovacs, R. Guesten et al.·Aug 25, 2008SaveLearn
High-resolution X-ray spectroscopy of Theta CarContext : The peculiar hot star Theta Car in the open cluster IC2602 is a blue straggler as well as a single-line binary of short period (2.2d). Aims : Its high-energy properties are not well known,…Yael Naze, Gregor Rauw·Aug 25, 2008SaveLearn
Time Dependent Monochromatic Scattering of Radiation in One Dimensional Media: Analytical and Numerical SolutionsIn order to choose a numerical method for solving the time dependent equations of radiative transport, we obtain an exact solution for the time dependent radiation field in a one dimensional infinite…D. I. Nagirner, S. L. Kirusheva·Aug 25, 2008SaveLearn
The HST/ACS Atlas of Protoplanetary Disks in the Great Orion NebulaWe present the atlas of protoplanetary disks in the Orion Nebula based on the ACS/WFC images obtained for the HST Treasury Program on the Orion Nebula Cluster. The observations have been carried out…Luca Ricci, Massimo Robberto, David R. Soderblom·Aug 25, 2008SaveLearn
Chromospheric magnetic field and density structure measurements using hard X-rays in a flaring coronal loopA novel method of using hard X-rays as a diagnostic for chromospheric density and magnetic structures is developed to infer sub-arcsecond vertical variation of magnetic flux tube size and neutral gas…E. P. Kontar, I. G. Hannah, A. L. MacKinnon·Aug 25, 2008SaveLearn
The Araucaria Project: The Distance to the Sculptor Group Galaxy NGC 247 from Cepheid Variables Discovered in a Wide-FieldWe report on the discovery of a Cepheid population in the Sculptor Group spiral galaxy NGC 247 for the first time. On the basis of wide-field images collected in photometric surveys in V and I bands…A. Garcia-Varela, G. Pietrzynski, W. Gieren et al.·Aug 25, 2008SaveLearn
On the nature of an ejection event in the jet of 3C111We present a possible scenario for the ejection of a superluminal component in the jet of the Broad Line Radio Galaxy 3C111 in early 1996. VLBI observations at 15 GHz discovered the presence of two…M. Perucho, I. Agudo, J. L. Gomez et al.·Aug 25, 2008SaveLearn
The Dark-Matter Fraction in the Elliptical Galaxy Lensing the Quasar PG1115+080We determine the most likely dark-matter fraction in the elliptical galaxy quadruply lensing the quasar PG1115+080 based on analyses of the X-ray fluxes of the individual images in 2000 and 2008.…D. Pooley, S. Rappaport, J. Blackburne et al.·Aug 25, 2008SaveLearn
A dynamical perspective on additional planets in 55 CancriFive planets are known to orbit the star 55 Cancri. The recently-discovered planet f at 0.78 AU (Fischer et al. 2008) is located at the inner edge of a previously-identified stable zone that…Sean N. Raymond, Rory Barnes, Noel Gorelick·Aug 25, 2008SaveLearn
Stellar Populations in the Andromeda V Dwarf Spheroidal GalaxyUsing archival imaging from the Wide Field Planetary Camera 2 aboard the Hubble Space Telescope, we investigate the stellar populations of the Local Group dwarf spheroidal Andromeda V - a companion…Conor Mancone, Ata Sarajedini·Aug 25, 2008SaveLearn
Clustered and Triggered Star Formation in W5: Observations with SpitzerWe present images and initial results from our extensive Spitzer Space Telescope imaging survey of the W5 H II region with the Infrared Array Camera (IRAC) and Multiband Imaging Photometer for…Xavier P. Koenig, Lori E. Allen, Robert A. Gutermuth et al.·Aug 25, 2008SaveLearn
Evidence for Correlations Between Nuclear Decay Rates and Earth-Sun DistanceUnexplained periodic fluctuations in the decay rates of Si-32 and Ra-226 have been reported by groups at Brookhaven National Laboratory (Si-32), and at the Physikalisch-Technische-Bundesandstalt in…Jere H. Jenkins, Ephraim Fischbach, John B. Buncher et al.·Aug 25, 2008SaveLearn
Most Population III Supernovae are DudsOne Population III dud supernova produces enough oxygen to enable ten million solar masses of primordial gas to bind into M dwarfs. This is possible because radiation from other Population III stars…Robert L. Kurucz·Aug 25, 2008SaveLearn
High M/L ratios of UCDs: a variation of the IMF?Various studies have established that the dynamical M/L ratios of ultra-compact dwarf galaxies (UCDs) tend to be at the limit or beyond the range explicable by standard stellar populations with…S. Mieske, J. Dabringhausen, P. Kroupa et al.·Aug 24, 2008SaveLearn
Minimal Energy Transfer of Solid Material Between Planetary SystemsThe exchange of meteorites among the terrestrial planets of our Solar System is a well established phenomenon that has triggered discussion of lithopanspermia within the Solar System. Similarly,…Edward Belbruno, Amaya Moro-Martin, Renu Malhotra·Aug 24, 2008SaveLearn
Impact of Uncertainties in the Cosmological Parameters on the Measurement of Primordial non-GaussianityWe study the impact of cosmological parameters' uncertainties on estimates of the primordial NG parameter fNL in local and equilateral models of non-Gaussianity. We show that propagating these…M. Liguori, A. Riotto·Aug 24, 2008SaveLearn
Hydro-Gravitational-Dynamics of Planets and Dark EnergySelf-gravitational fluid mechanical methods termed hydro-gravitational-dynamics (HGD) predict plasma fragmentation 0.03 Myr after the turbulent big bang to form protosuperclustervoids, turbulent…Carl H. Gibson, Rudolph E. Schild·Aug 24, 2008SaveLearn
Observations of Active Region Loops with the EUV Imaging Spectrometer on HinodePrevious solar observations have shown that coronal loops near 1 MK are difficult to reconcile with simple heating models. These loops have lifetimes that are long relative to a radiative cooling…Harry P. Warren, Ignacio Ugarte-Urra, George A. Doschek et al.·Aug 24, 2008SaveLearn
A Molecular Line Survey of the Highly Evolved Carbon Star CIT 6We present a spectral line survey of the C-rich envelope CIT 6 in the 2mm and 1.3mm bands carried out with the Arizona Radio Observatory (ARO) 12m telescope and the Heinrich Hertz Submillimeter…Yong Zhang, Sun Kwok, Dinh-V-Trung·Aug 24, 2008SaveLearn