A blueprint for detecting supersymmetric dark matter in the Galactic haloDark matter is the dominant form of matter in the universe, but its nature is unknown. It is plausibly an elementary particle, perhaps the lightest supersymmetric partner of known particle species.…Volker Springel, Simon D. M. White, Carlos S. Frenk et al.·Sep 5, 2008SaveLearn
Can proper motions of dark-matter subhalos be detected?One of the goals of NASA's Fermi Gamma-ray Space Telescope (formerly GLAST) will be detection of gamma rays from dark-matter annihilation in the Galactic halo. Theoretical arguments suggest that…Shin'ichiro Ando, Marc Kamionkowski, Samuel K. Lee et al.·Sep 4, 2008SaveLearn
Optically Thick Outflows of Supercritical Accretion Discs: Radiative Diffusion ApproachHighly supercritical accretion discs are probable sources of dense optically thick axisymmetric winds. We introduce a new approach based on diffusion approximation radiative transfer in a funnel…P. Abolmasov, S. Karpov, Taro Kotani·Sep 4, 2008SaveLearn
Mass models and environment of the new quadruply lensed quasar SDSS J1330+1810We present the discovery of a new quadruply lensed quasar. The lens system, SDSS J1330+1810 at zs=1.393, was identified as a lens candidate from the spectroscopic sample of the Sloan Digital Sky…Masamune Oguri, Naohisa Inada, Jeffrey A. Blackburne et al.·Sep 4, 2008SaveLearn
Five New High-Redshift Quasar Lenses from the Sloan Digital Sky SurveyWe report the discovery of five gravitationally lensed quasars from the Sloan Digital Sky Survey (SDSS). All five systems are selected as two-image lensed quasar candidates from a sample of…Naohisa Inada, Masamune Oguri, Min-Su Shin et al.·Sep 4, 2008SaveLearn
Outliers from the Mass--Metallicity Relation II: A Sample of Massive Metal-Poor Galaxies from SDSSWe present a sample of 42 high-mass low-metallicity outliers from the mass--metallicity relation of star-forming galaxies. These galaxies have stellar masses that span log(M*/Msun) ~9.4 to 11.1 and…Molly S. Peeples, Richard W. Pogge, K. Z. Stanek·Sep 4, 2008SaveLearn
Late Ordovician geographic patterns of extinction compared with simulations of astrophysical ionizing radiation damageBased on the intensity and rates of various kinds of intense ionizing radiation events such as supernovae and gamma-ray bursts, it is likely that the Earth has been subjected to one or extinction…Adrian L. Melott, Brian C. Thomas·Sep 4, 2008SaveLearn
Cassiopeia A: dust factory revealed via submillimetre polarimetryIf Type-II supernovae - the evolutionary end points of short-lived, massive stars - produce a significant quantity of dust (>0.1 Msun) then they can explain the rest-frame far-infrared emission seen…L. Dunne, S. J. Maddox, R. J. Ivison et al.·Sep 4, 2008SaveLearn
The Reddest DR3 SDSS/XMM QuasarsWe have cross-correlated the SDSS DR3 Schneider et al. (2005) quasar catalog with the XMM-Newton archive. Color and redshift selections (g - r > 0.5 and 0.9 z < 2.1) result in a sample of 17 red,…Monica Young, Martin Elvis, Guido Risaliti·Sep 4, 2008SaveLearn
Reliable Eigenspectra for New Generation SurveysWe present a novel technique to overcome the limitations of the applicability of Principal Component Analysis to typical real-life data sets, especially astronomical spectra. Our new approach…Tamas Budavari, Vivienne Wild, Alexander S. Szalay et al.·Sep 4, 2008SaveLearn
Inferring the Inclination of a Black Hole Accretion Disk from Observations of its Polarized Continuum RadiationSpin parameters of stellar-mass black holes in X-ray binaries are currently being estimated by fitting the X-ray continuum spectra of their accretion disk emission. For this method, it is necessary…Li-Xin Li, Ramesh Narayan, Jeffrey E. McClintock·Sep 4, 2008SaveLearn
Edge Detection, Cosmic Strings and the South Pole TelescopeWe develop a method of constraining the cosmic string tension Gμ which uses the Canny edge detection algorithm as a means of searching CMB temperature maps for the signature of the Kaiser-Stebbins…Andrew Stewart, Robert Brandenberger·Sep 4, 2008SaveLearn
A two-columns formalism for time-dependent modelling of stellar convection. I. Description of the methodDespite all advances in multi-dimensional hydrodynamics, investigations of stellar evolution and stellar pulsations still depend on one-dimensional computations. The present work devises an…Alexander Stoekl·Sep 4, 2008SaveLearn
The Properties of Early-type Stars in the Magellanic CloudsThe past decade has witnessed impressive progress in our understanding of the physical properties of massive stars in the Magellanic Clouds, and how they compare to their cousins in the Galaxy. I…Christopher J. Evans·Sep 4, 2008SaveLearn
On the absorption of X-ray bright broad absorption line quasarsMost X-ray studies of BALQSOs found significant (NH~1022-24 cm-2) intrinsic column densities of gas absorbing an underlying typical power-law continuum emission, in agreement with expectations…Margherita Giustini, Massimo Cappi, Cristian Vignali·Sep 4, 2008SaveLearn
A new approach for probing circumbinary disksCircumbinary disks are considered to exist in a wide variety of astrophysical objects, e.g., young binary stars, protoplanetary systems, and massive binary black hole systems in active galactic…Kimitake Hayasaki, Atsuo T. Okazaki·Sep 4, 2008SaveLearn
Higher order corrections to the large scale matter power spectrum in the presence of massive neutrinosWe present the first systematic derivation of the one-loop correction to the large scale matter power spectrum in a mixed cold+hot dark matter cosmology with subdominant massive neutrino hot dark…Yvonne Y. Y. Wong·Sep 4, 2008SaveLearn
On measuring the gravitational-wave background using Pulsar Timing ArraysLong-term precise timing of Galactic millisecond pulsars holds great promise for measuring the long-period (months-to-years) astrophysical gravitational waves. Several gravitational-wave…Rutger van Haasteren, Yuri Levin, Patrick McDonald et al.·Sep 4, 2008SaveLearn
The Solar Coronal Magnetic Field Measurements With SOLARCDirect solar coronal magnetic field measurements have become possible since recent development of high-sensitivity infrared detection technology. The SOLARC instrument installed on Mt. Haleakala is…Y. Liu, H. Lin·Sep 4, 2008SaveLearn
Galaxy Zoo: Chiral correlation function of galaxy spinsGalaxy Zoo is the first study of nearby galaxies that contains reliable information about the spiral sense of rotation of galaxy arms for a sizeable number of galaxies. We measure the correlation…Anze Slosar, Kate Land, Steven Bamford et al.·Sep 4, 2008SaveLearn
New Pulsating DB White Dwarf Stars from the Sloan Digital Sky SurveyWe are searching for new He atmosphere white dwarf pulsators (DBVs) based on the newly found white dwarf stars from the spectra obtained by the Sloan Digital Sky Survey. DBVs pulsate at hotter…A. Nitta, S. J. Kleinman, J. Krzesinski et al.·Sep 4, 2008SaveLearn
Detection of the 2175Å~ extinction feature and 21-cm absorption in two MgII systems at z~1.3We have discovered two dusty intervening MgII absorption systems at z~1.3 in the Sloan Digital Sky Survey (SDSS) database. The overall spectra of both QSOs are red (u-K>4.5 mag) and are well modelled…R. Srianand, N. Gupta, P. Petitjean et al.·Sep 4, 2008SaveLearn
Thermal Emission from Gamma-Ray BurstsIn recent years, there are increasing evidence for a thermal emission component that accompanies the overall non-thermal spectra of the prompt emission phase in GRBs. Both the temperature and flux of…Asaf Pe'er·Sep 4, 2008SaveLearn
The dynamical structure of dark matter halos with universal propertiesN-body simulations have unveiled several apparently universal properties of dark matter halos, including a cusped density profile, a power-law pseudo phase-space density ρ/σr3, and a linear…Emmanuel Van Hese, Maarten Baes, Herwig Dejonghe·Sep 4, 2008SaveLearn
Visual orbit of GJ 164 ABWe report seven successful observations of the astrometric binary GJ 164 AB system with aperture masking interferometry. The companion, with a near infrared contrast of 5:1 was detected beyond the…Frantz Martinache, Barbara Rojas-Ayala, Michael J. Ireland et al.·Sep 4, 2008SaveLearn