High mass X-ray binary SXP18.3 undergoes the longest Type II outburst ever seen in the Small Magellanic CloudOn 30th August 2006 SXP18.3 a high mass X-ray binary (HMXB) in the Small Magellanic Cloud (SMC) with an 18.3s pulse period was observed by Rossi X-ray Timing Explorer (RXTE). The source was seen…M. P. E. Schurch, M. J. Coe, J. L. Galache et al.·Oct 8, 2008SaveLearn
IRC-10443: a multi-periodic SRa variable and the nature of long secondary periods in AGB starsWe obtained BVIc photometry of IRC-10443 on 85 different nights distributed over two years, and in addition low resolution absolute spectro- photometry and high resolution Echelle spectroscopy. Our…U. Munari, A. Siviero, P. Ochner et al.·Oct 8, 2008SaveLearn
AGN accretion disks as spatially resolved by polarimetryA crucial difficulty in understanding the nature of the putative accretion disk in AGNs is that some of its key intrinsic spectral signatures cannot be observed directly. The strong emissions from…Makoto Kishimoto, Robert Antonucci, Omer Blaes et al.·Oct 8, 2008SaveLearn
Do the fundamental constants change with time ?Comparisons between the redshifts of spectral lines from cosmologically-distant galaxies can be used to probe temporal changes in low-energy fundamental constants like the fine structure constant and…Nissim Kanekar·Oct 8, 2008SaveLearn
Physical Properties of Main-Belt Comet P/2005 U1 (Read)The main-belt comets occupy dynamically asteroidal orbits in the main asteroid belt. Here we present physical observations of the second-known member of this population, P/2005 U1 (Read), which…Henry H. Hsieh, David Jewitt, Masateru Ishiguro·Oct 8, 2008SaveLearn
Self-Similar Solution of Hot Accretion Flows with Ordered Magnetic Field and OutflowObservations and numerical magnetohydrodynamic (MHD) simulations indicate the existence of outflows and ordered large-scale magnetic fields in the inner region of hot accretion flows. In this paper…De-Fu Bu, Feng Yuan, Fu-Guo Xie·Oct 8, 2008SaveLearn
The August 24, 2002 Coronal Mass Ejection: When a Western Limb Event Connects to EarthWe discuss how some coronal mass ejections (CMEs) originating from the western limb of the Sun are associated with space weather effects such as solar energetic particles (SEPs), shock or…N. Lugaz, I. I. Roussev, I. V. Sokolov·Oct 8, 2008SaveLearn
The PN.S Elliptical Galaxy Survey: the dark matter in NGC 4494We present new Planetary Nebula Spectrograph observations of the ordinary elliptical galaxy NGC 4494, resulting in positions and velocities of 255 PNe out to 7 effective radii (25 kpc). We also…N. R. Napolitano, A. J. Romanowsky, L. Coccato et al.·Oct 8, 2008SaveLearn
Inspecting absorption in the spectra of extra-galactic gamma-ray sources for insight into Lorentz invariance violationWe examine what the absorbed spectra of extra-galactic TeV gamma-ray sources, such as blazars, would look like in the presence of Lorentz invariance violation (LIV). Pair-production with the…Uri Jacob, Tsvi Piran·Oct 7, 2008SaveLearn
How to De-Rotate the Cosmic Microwave Background PolarizationIf the linear polarization of the cosmic microwave background (CMB) is rotated in a frequency-independent manner as it propagates from the surface of last scatter, it may introduce a B-mode…Marc Kamionkowski·Oct 7, 2008SaveLearn
The Gamma-Ray-Flux Probability Distribution Function from Galactic Halo SubstructureOne of the targets of the recently launched Fermi Gamma-ray Space Telescope is a diffuse gamma-ray background from dark-matter annihilation or decay in the Galactic halo. N-body simulations and…Samuel K. Lee, Shin'ichiro Ando, Marc Kamionkowski·Oct 7, 2008SaveLearn
Corotational Damping of Diskoseismic C-modes in Black Hole Accretion DiscsDiskoseismic c-modes in accretion discs have been invoked to explain low-frequency variabilities observed in black-hole X-ray binaries. These modes are trapped in the inner-most region of the disc…David Tsang, Dong Lai·Oct 7, 2008SaveLearn
On the common mass scale of the Milky Way satellitesWe use a hybrid approach that combines high-resolution simulations of the formation of a Milky Way-like halo with a semi-analytic model of galaxy formation to study the mass content of dwarf galaxies…Yang-Shyang Li, Amina Helmi, Gabriella De Lucia et al.·Oct 7, 2008SaveLearn
The outburst triggered by the Deep Impact collision with Comet Tempel 1Time variations in velocities and relative amount of observed particles (mainly icy particles with diameter d<3 μm) ejected from Comet 9P/Tempel 1 are studied based on analysis of the images made by…Sergei I. Ipatov, Michael F. A'Hearn·Oct 7, 2008SaveLearn
Prompt TeV Emission from Cosmic Rays Accelerated by Gamma Ray Bursts Interacting with Surrounding Stellar WindProtons accelerated in the internal shocks of a long duration gamma ray burst can escape the fireball as cosmic rays by converting to neutrons. Hadronic interactions of these neutrons inside a…Soebur Razzaque, Olga Mena, Charles D. Dermer·Oct 7, 2008SaveLearn
Dark Matter Equilibria in Galaxies and Galaxy Systems[abridged] In the dark matter (DM) halos embedding galaxies and galaxy systems the `entropy' K = σ2 / ρ2/3 (a quantity that combines the radial velocity dispersion σwith the density ρ) is…A. Lapi, A. Cavaliere·Oct 7, 2008SaveLearn
SDSSJ092712.65+294344.0: NGC 1275 at z=0.7?SDSSJ092712.65+294344.0 was identified by the SDSS as a quasar, but has the unusual property of having two emission line systems offset by 2650 km/s. One of these contains the usual combination of…Timothy M. Heckman, Julian H. Krolik, Sean M. Moran et al.·Oct 7, 2008SaveLearn
Statistics of the gravitational force in various dimensions of space: from Gaussian to Levy lawsWe discuss the distribution of the gravitational force created by a Poissonian distribution of field sources (stars, galaxies,...) in different dimensions of space d. In d=3, it is given by a Levy…Pierre-Henri Chavanis·Oct 7, 2008SaveLearn
Lee Wick Dark EnergyWe consider the cosmological application of Lee-Wick theory where a field has a higher derivative kinetic operators. The higher derivative term can be eliminated by introducing a set of auxiliary…Seokcheon Lee·Oct 7, 2008SaveLearn
Constraints on the time variation of the fine structure constant by the 5-year WMAP dataThe constraints on the time variation of the fine structure constant at recombination epoch relative to its present value, Δα/α (αrec - αnow)/αnow, are…Masahiro Nakashima, Ryo Nagata, Jun'ichi Yokoyama·Oct 7, 2008SaveLearn
Prior Emission Model for X-ray Plateau Phase of Gamma-Ray Burst AfterglowsThe two-component emission model to explain the plateau phase of the X-ray afterglows of gamma-ray bursts (GRBs) is proposed. One component, which is responsible for the plateau and subsequent normal…Ryo Yamazaki·Oct 7, 2008SaveLearn
Low Mass Star Formation in the Taurus-Auriga CloudsWe review the history and structure of star formation in the Taurus-Auriga dark clouds. Our discussion includes a summary of the macroscopic cloud properties, the population of single and binary…Scott J. Kenyon, Mercedes Gomez, Barbara A. Whitney·Oct 7, 2008SaveLearn
MAMBO 1.2mm observations of luminous starbursts at z~2 in the SWIRE fieldsWe report on--off pointed MAMBO observations at 1.2 mm of 61 Spitzer-selected star-forming galaxies from the SWIRE survey. The sources are selected on the basis of bright 24um fluxes (f24um>0.4mJy)…C. J. Lonsdale, M. Polletta, A. Omont et al.·Oct 7, 2008SaveLearn
Galaxy formation & evolution: the far-ir/sub-mm viewWe review our current knowledge of the population of high-redshift sub-mm/mm galaxies, with particular emphasis on recent results from the SCUBA HAlf Degree Extragalactic Survey (SHADES). All…M. Cirasuolo, J. S. Dunlop·Oct 7, 2008SaveLearn
Stellar disruption by a supermassive black hole: is the light curve really proportional to t-5/3?In this paper we revisit the arguments for the basis of the time evolution of the flares expected to arise when a star is disrupted by a supermassive black hole. We present a simple analytic model…G. Lodato, A. R. King, J. E. Pringle·Oct 7, 2008SaveLearn