Dark stars at the Galactic centre - the main sequenceIn regions of very high dark matter density such as the Galactic centre, the capture and annihilation of WIMP dark matter by stars has the potential to significantly alter their evolution. We…Pat Scott, Malcolm Fairbairn, Joakim Edsjö·Sep 10, 2008SaveLearn
Exploring the Small Magellanic Cloud to the Faintest X-ray Fluxes: Source Catalog, Timing and Spectral AnalysisWe present the results of a pair of 100 ksec Chandra observations in the Small Magellanic Cloud to survey high mass X-ray binaries (HMXBs), stars and LMXBs/CVs down to Lx = 4.3 x 1032 erg/s The two…Silas Laycock, Andreas Zezas, Jaesub Hong et al.·Sep 10, 2008SaveLearn
On lensing by a cosmological constantSeveral recent papers have suggested that the cosmological constant Lambda directly influences the gravitational deflection of light. We place this problem in a cosmological context, deriving an…Fergus Simpson, John A. Peacock, Alan F. Heavens·Sep 10, 2008SaveLearn
Commissioning Run of the CRESST-II Dark Matter SearchThe CRESST cryogenic direct dark matter search at Gran Sasso, searching for WIMPs via nuclear recoil, has been upgraded to CRESST-II by several changes and improvements.We present the results of a…G. Angloher, M. Bauer, I. Bavykina et al.·Sep 10, 2008SaveLearn
Detecting Chameleons: The Astronomical Polarization Produced by Chameleon-like Scalar FieldsWe show that a coupling between chameleon-like scalar fields and photons induces linear and circular polarization in the light from astrophysical sources. In this context chameleon-like scalar fields…Clare Burrage, Anne-Christine Davis, Douglas J. Shaw·Sep 10, 2008SaveLearn
Dry Mergers: A Crucial Test for Galaxy FormationWe investigate the role that dry mergers play in the build-up of massive galaxies within the cold dark matter paradigm. Implementing an empirical shut-off mass scale for star formation, we find a…S. Khochfar, J. Silk·Sep 10, 2008SaveLearn
Modelling clusters of galaxies by f(R)-gravityWe consider the possibility that masses and gravitational potentials of galaxy cluster, estimated at X-ray wavelengths, could be explained without assuming huge amounts of dark matter, but in the…S. Capozziello, E. De Filippis, V. Salzano·Sep 10, 2008SaveLearn
Determining Parameters of Cool Giant Stars by Modeling Spectrophotometric and Interferometric Observations Using the SAtlas ProgramContext: Optical interferometry is a powerful tool for observing the intensity structure and angular diameter of stars. When combined with spectroscopy and/or spectrophotometry, interferometry…Hilding R. Neilson, John B. Lester·Sep 10, 2008SaveLearn
Closing in on the sources of Galactic and extragalactic cosmic raysWe speculate that a new generation of particle astrophysics instrumentation will reveal the enigmatic sources of cosmic rays prior to the one hundredth anniversary of their discovery by Hess in 1912.…Francis Halzen·Sep 10, 2008SaveLearn
SAtlas: Spherical Versions of the Atlas Stellar Atmosphere ProgramContext: The current stellar atmosphere programs still cannot match some fundamental observations of the brightest stars, and with new techniques, such as optical interferometry, providing new data…John B. Lester, Hilding R. Neilson·Sep 10, 2008SaveLearn
Modeling the color evolution of luminous red galaxies - improvements with empirical stellar spectraPredicting the colors of Luminous Red Galaxies (LRGs) in the Sloan Digital Sky Survey (SDSS) has been a long-standing problem. The g,r,i colors of LRGs are inconsistent with stellar population models…Claudia Maraston, Gustav Stromback, Daniel Thomas et al.·Sep 10, 2008SaveLearn
Frame-dragging and the kinematics of Galactic-Center starsWe calculate the effects of frame dragging on the Galactic-Center stars. Assuming the stars are only slightly relativistic, we derive an approximation to the Kerr metric, which turns out to be a weak…Rahul Kannan, Prasenjit Saha·Sep 10, 2008SaveLearn
TiO and VO broad band absorption features in the optical spectrum of the atmosphere of the hot-Jupiter HD209458bThe presence of titanium oxide (TiO) and vanadium oxide (VO) gas phase species is searched for in the atmosphere of the hot Jupiter HD209458b. We compared a model for the planets transmitted spectrum…J. -M. Desert, A. Vidal-Madjar, A. Lecavelier des Etangs et al.·Sep 10, 2008SaveLearn
Planetary Transits and Tidal EvolutionTransiting planets are generally close enough to their host stars that tides may govern their orbital and thermal evolution of these planets. We present calculations of the tidal evolution of…Brian Jackson, Rory Barnes, Richard Greenberg·Sep 10, 2008SaveLearn
Discovery of lake-effect clouds on TitanImages from instruments on Cassini as well as from telescopes on the ground reveal the presence of sporadic small-scale cloud activity in the cold late-winter north polar of Saturn's large moon…M. E. Brown, E. L. Schaller, H. G. Roe et al.·Sep 10, 2008SaveLearn
First measurement of the Head-Tail directional nuclear recoil signature at energies relevant to WIMP dark matter searchesWe present first evidence for the so-called Head-Tail asymmetry signature of neutron-induced nuclear recoil tracks at energies down to 1.5 keV/amu using the 1m3 DRIFT-IIc dark matter detector. This…S. Burgos, E. Daw, J. Forbes et al.·Sep 10, 2008SaveLearn
Fainter and closer: finding planets by symmetry breakingImaging of planets is very difficult, due to the glare from their nearby, much brighter suns. Static and slowly-evolving aberrations are the limiting factors, even after application of adaptive…Erez N. Ribak, Szymon Gladysz·Sep 10, 2008SaveLearn
Formation and Evolution of Cataclysmic VariablesThis article summarizes the basic facts and ideas concerning the formation and evolution of cataclysmic variables (CVs). It is shown why the formation of CVs must involve huge losses of mass and…H. Ritter·Sep 10, 2008SaveLearn
Extended Emission of Short Gamma-Ray BurstsPreliminary results of our analysis on the extended emission of short/medium duration GRBs observed with Swift/BAT are presented. The Bayesian blocks algorithm is used to analyze the burst durations…Lin Lin, En-Wei Liang, Bin-Bin Zhang et al.·Sep 10, 2008SaveLearn
The advection-dominated accretion flow+thin accretion disk model for two low-luminosity active galactic nuclei: M81 and NGC4579It was found that the advection-dominated accretion flow (ADAF)+thin disk model calculations can reproduce the observed spectral energy distributions (SED) of the two low luminosity AGN, provided…Ya-Di Xu, Xinwu Cao·Sep 10, 2008SaveLearn
VIMOS-VLT Integral Field Kinematics of the Giant Low Surface Brightness Galaxy ESO 323-G064Aims:We have studied the bulge and the disk kinematics of the giant low surface brightness galaxy ESO 323-G064 in order to investigate its dynamical properties and the radial mass profile of the dark…L. Coccato, R. A. Swaters, V. C. Rubin et al.·Sep 10, 2008SaveLearn
On the tidal evolution of the orbits of low-mass satellites around black holesLow-mass satellites, like asteroids and comets, are expected to be present around the black hole at the Galactic center. We consider small bodies orbiting a black hole, and we study the evolution of…A. Cadez, M. Calvani, U. Kostic·Sep 10, 2008SaveLearn
HI and star formation in the most metal-deficient galaxiesWe present Giant Metrewave Radio Telescope (GMRT) observations for three (viz., DDO 68, SDSS J2104-0035 and UGC 772) of the six most metal-deficient actively star-forming galaxies known. Although…Ekta, Jayaram N. Chengalur, S. A. Pustilnik·Sep 10, 2008SaveLearn
Hydrodynamical simulations of the jet in the symbiotic star MWC 560. II. Simulations beyond density balance(Abridged) In the first paper of this series, we presented hydrodynamical simulations with radiative cooling of jet models with parameters representative of the symbiotic system MWC 560. These were…Matthias Stute·Sep 10, 2008SaveLearn
Orbital periods of cataclysmic variables identified by the SDSS. V. VLT, NTT and Magellan observations of nine equatorial systemsWe present VLT and Magellan spectroscopy and NTT photometry of nine faint cataclysmic variables (CVs) which were spectroscopically identified by the SDSS. We measure orbital periods for five of these…John Southworth, B T Gaensicke, T R Marsh et al.·Sep 10, 2008SaveLearn