A Fast Potential and Self-Gravity Solver for Non-Axisymmetric DisksDisk self-gravity could play an important role in the dynamic evolution of interaction between disks and embedded protoplanets. We have developed a fast and accurate solver to calculate the disk…S. Li, M. J. Buoni, H. Li·Dec 2, 2008SaveLearn
Type I Planet Migration in Nearly Laminar DisksWe describe 2D hydrodynamic simulations of the migration of low-mass planets (≤ 30 M) in nearly laminar disks (viscosity parameter α< 10-3) over timescales of several thousand…H. Li, S. H. Lubow, S. Li et al.·Dec 2, 2008SaveLearn
Cross-Calibration of Cluster Mass-ObservablesThis paper is a first step towards developing a formalism to optimally extract dark energy information from number counts using multiple cluster observation techniques. We use a Fisher matrix…Carlos Cunha·Dec 2, 2008SaveLearn
Obtaining the diffusion coefficient for cosmic ray propagation in the Galactic Centre Ridge through time-dependent simulations of their gamma-ray emissionRecent observations by the H.E.S.S. collaboration of the Galactic Centre region have revealed what appears to be gamma-ray emission from the decay of pions produced by interactions of recently…Stavros Dimitrakoudis, Apostolos Mastichiadis, Athanasios Geranios·Dec 2, 2008SaveLearn
Abundances in the Galactic bulge: results from planetary nebulae and giant starsOur understanding of the chemical evolution of the Galactic bulge requires the determination of abundances in large samples of giant stars and planetary nebulae (PNe). We discuss PNe abundances in…C. Chiappini, S. Gorny, G. Stasinska et al.·Dec 2, 2008SaveLearn
Variable Intrinsic Absorption in Mrk 279We examine the variability in the intrinsic absorption in the Seyfert 1 galaxy Mrk 279 using three epochs of observations from the Far Ultraviolet Spectroscopic Explorer (FUSE) and two epochs of…Jennifer E. Scott, Nahum Arav, Jack R. Gabel et al.·Dec 2, 2008SaveLearn
Modeling the Local Warm/Hot BubbleIn this paper we review the modeling of the Local Bubble (LB) with special emphasis on the progress we have made since the last major conference "The Local Bubble and Beyond (I)" held in…Dieter Breitschwerdt, Miguel A. de Avillez, Verena Baumgartner·Dec 2, 2008SaveLearn
SDSS White Dwarf mass distribution at low effective temperaturesThe DA white dwarfs in the Sloan Digital Sky Survey, as analyzed in the papers for Data Releases 1 and 4, show an increase in surface gravity towards lower effective temperatures below 11500 K. We…D. Koester, S. O. Kepler, S. J. Kleinman et al.·Dec 2, 2008SaveLearn
Ion-Acoustic Solitons in Bi-Ion Dusty PlasmaThe propagation of ion-acoustic solitons in a warm dusty plasma containing two ion species is investigated theoretically. Using an approach based on the Korteveg-de-Vries equation, it is shown that…V. V. Prudskikh·Dec 2, 2008SaveLearn
Solitary Dust--Acoustic Waves in a Plasma with Two-Temperature Ions and Distributed Grain SizeThe propagation of weakly nonlinear dust--acoustic waves in a dusty plasma containing two ion species with different temperatures is explored. The nonlinear equations describing both the quadratic…V. V. Prudskikh·Dec 2, 2008SaveLearn
White Dwarf Spectra and Atmosphere ModelsWe describe the spectral classification of white dwarfs and some of the physical processes important for their understanding. In the major part of this paper we discuss the input physics and…Detlev Koester·Dec 2, 2008SaveLearn
Searching for Radio Pulsars in 3EG Sources at Urumqi ObservatorySince mid-2005, a pulsar searching system has been operating at 18 cm on the 25-m radio telescope of Urumqi Observatory. Test observations on known pulsars show that the system can perform the…Jiang Dong, Na Wang·Dec 2, 2008SaveLearn
Brightness, distribution, and evolution of sunspot umbral dotsWe present a 106-minute TiO (705.7nm) time series of high spatial and temporal resolution that contains thousands of umbral dots (UDs) in a mature sunspot in the active region NOAA 10667 at μ=0.95.…T. L. Riethmueller, S. K. Solanki, V. Zakharov et al.·Dec 2, 2008SaveLearn
AGN's UV and X-ray luminosities in clumpy accretion flowsWe consider the fuelling of the central massive black hole in Active Galactic Nuclei, through an inhomogeneous accretion flow. Performing simple analytical treatments, we show that shocks between…W. Ishibashi, T. J. -L. Courvoisier·Dec 2, 2008SaveLearn
Chandra Observations of Nuclear X-ray Emission from Low Surface Brightness GalaxiesWe present Chandra detections of x-ray emission from the AGN in two giant Low Surface Brightness (LSB) galaxies, UGC 2936 and UGC 1455. Their x-ray luminosities are 1.8×1042 ergs/s and…M. Das, C. S. Reynolds, S. N. Vogel et al.·Dec 2, 2008SaveLearn
Powerful H2 Emission and Star Formation on the Interacting Galaxy System Arp 143: Observations with Spitzer and GALEXWe present new mid-infrared (5 - 35μm) and ultraviolet (1539 -- 2316 Å) observations of the interacting galaxy system Arp 143 (NGC 2444/2445) from the Spitzer Space Telescope and GALEX. In this…P. Beirão, P. N. Appleton, B. R. Brandl et al.·Dec 2, 2008SaveLearn
The IR Luminosity Functions of Rich ClustersWe present MIPS observations of the cluster A3266. About 100 spectroscopic cluster members have been detected at 24 micron. The IR luminosity function in A3266 is very similar to that in the Coma…Lei Bai, George H. Rieke, Marcia J. Rieke et al.·Dec 2, 2008SaveLearn
Nuclear constraints on gravitational waves from rapidly rotating neutron starsGravitational waves are tiny disturbances in space-time and are a fundamental, although not yet directly confirmed, prediction of General Relativity. Rapidly rotating neutron stars are one of the…Aaron Worley, Plamen G. Krastev, Bao-An Li·Dec 2, 2008SaveLearn
Phase-space structure in the local dark matter distribution and its signature in direct detection experimentsWe study predictions for dark matter phase-space structure near the Sun based on high-resolution simulations of six galaxy halos taken from the Aquarius Project. The local DM density distribution is…Mark Vogelsberger, Amina Helmi, Volker Springel et al.·Dec 2, 2008SaveLearn
A Chandra X-ray view of Stephan's Quintet: Shocks and Star-formationWe use a deep Chandra observation to examine the structure of the hot intra-group medium of the compact group of galaxies Stephan's Quintet. The group is thought to be undergoing a strong…E. O'Sullivan, S. Giacintucci, J. M. Vrtilek et al.·Dec 1, 2008SaveLearn
Forming a Large Disc Galaxy from a z<1 Major MergerUsing high resolution SPH simulations in a fully cosmological Lambda CDM context we study the formation of a bright disk dominated galaxy that originates from a "wet" major merger at z=0.8.…F. Governato, C. B. Brook, A. M. Brooks et al.·Dec 1, 2008SaveLearn
Asteroseismology of chemically peculiar starsPulsational variability is observed in several types of main sequence stars with anomalous chemical abundances. In this contribution I summarize the relationship between pulsations and chemical…O. Kochukhov·Dec 1, 2008SaveLearn
Imaging the Black Hole Silhouette of M87: Implications for Jet Formation and Black Hole SpinThe silhouette cast by the horizon of the supermassive black hole in M87 can now be resolved with the emerging millimeter very-long baseline interferometry (VLBI) capability. Despite being ~2000…Avery E. Broderick, Abraham Loeb·Dec 1, 2008SaveLearn
Possible Quasi-Periodic Oscillations from Unstable Accretion: 3D MHD SimulationsWe investigate the photometric variability of magnetized stars, particularly neutron stars, accreting through a magnetic Rayleigh-Taylor-type instability at the disk-magnetosphere interface, and…Akshay K. Kulkarni, Marina M. Romanova·Dec 1, 2008SaveLearn
Three-Point Correlations in f(R) Models of GravityModifications of general relativity provide an alternative explanation to dark energy for the observed acceleration of the universe. We calculate quasilinear effects in the growth of structure in…Alex Borisov, Bhuvnesh Jain·Dec 1, 2008SaveLearn