Inflationary trispectrum from graviton exchangeWe compute the connected four-point correlation function of the primordial curvature perturbation generated during inflation with standard kinetic terms, where the correlation is established via…David Seery, Martin S. Sloth, Filippo Vernizzi·Nov 24, 2008SaveLearn
SN 2008S: A Cool Super-Eddington Wind in a Supernova ImpostorWe present visual-wavelength photometry and spectroscopy of supernova SN2008S. Based on the low peak luminosity for a SN of MR = -13.9 mag, photometric and spectral evolution unlike that of…Nathan Smith, Mohan Ganeshalingam, Ryan Chornock et al.·Nov 24, 2008SaveLearn
Can inhomogeneities solve the horizon problem ?We show how inhomogeneous cosmological models can naturally explain the large angle correlation we observe in the CMB (cosmological microwave background) radiation without invoking any inflationary…Antonio Enea Romano·Nov 24, 2008SaveLearn
Stellar activity of planetary host star HD 189733Extra-solar planet search programs require high-precision velocity measurements. They need to study how to disentangle radial-velocity variations due to Doppler motion from the noise induced by…I. Boisse, C. Moutou, A. Vidal-Madjar et al.·Nov 24, 2008SaveLearn
Three-Dimensional Relativistic MHD Simulations of the Kelvin-Helmholtz Instability: Magnetic Field Amplification by a Turbulent DynamoMagnetic field strengths inferred for relativistic outflows including gamma-ray bursts (GRB) and active galactic nuclei (AGN) are larger than naively expected by orders of magnitude. We present…Weiqun Zhang, Andrew MacFadyen, Peng Wang·Nov 24, 2008SaveLearn
Gamma-ray and radio tests of the e+e- excess from DM annihilationsPAMELA and ATIC recently reported an excess in e+e- cosmic rays. We show that if it is due to Dark Matter annihilations, the associated gamma-ray flux and the synchrotron emission produced by e+e- in…Gianfranco Bertone, Marco Cirelli, Alessandro Strumia et al.·Nov 24, 2008SaveLearn
CMBPol Mission Concept Study: Prospects for polarized foreground removalIn this report we discuss the impact of polarized foregrounds on a future CMBPol satellite mission. We review our current knowledge of Galactic polarized emission at microwave frequencies, including…J. Dunkley, A. Amblard, C. Baccigalupi et al.·Nov 24, 2008SaveLearn
Super Earth Explorer: A Coronagraphic Off-Axis Space TelescopeThe Super-Earth Explorer is an Off-Axis Space Telescope (SEE-COAST) designed for high contrast imaging. Its scientific objective is to make the physico-chemical characterization of exoplanets…J. Schneider, A. Boccaletti, D. Mawet et al.·Nov 24, 2008SaveLearn
The energy spectrum of cosmic-ray electrons at TeV energiesThe very large collection area of ground-based gamma-ray telescopes gives them a substantial advantage over balloon/satellite based instruments in the detection of very-high-energy (>600 GeV)…H. E. S. S. Collaboration, :, F. Aharonian·Nov 24, 2008SaveLearn
Evidence for Warped Disks of Young Stars in the Galactic CenterThe central parsec around the super-massive black hole in the Galactic Center hosts more than 100 young and massive stars. Outside the central cusp (R~1") the majority of these O and Wolf-Rayet…H. Bartko, F. Martins, T. K. Fritz et al.·Nov 24, 2008SaveLearn
Probing Spectroscopic Variability of Galaxies & Narrow-Line Active Galactic Nuclei in the Sloan Digital Sky SurveyUnder the unified model for active galactic nuclei (AGNs), narrow-line (Type 2) AGNs are, in fact, broad-line (Type 1) AGNs but each with a heavily obscured accretion disk. We would therefore expect…Ching-Wa Yip, Andrew Connolly, Daniel Vanden Berk et al.·Nov 24, 2008SaveLearn
GRBs as Probes of Massive Stars Near and FarLong-duration gamma-ray bursts are the manifestations of massive stellar death. Due to the immense energy release they are detectable from most of the observable universe. In this way they allow us…J. Fynbo, D. Malesani·Nov 24, 2008SaveLearn
The energy production rate & the generation spectrum of UHECRsWe derive simple analytic expressions for the flux and spectrum of ultra-high energy cosmic-rays (UHECRs) predicted in models where the CRs are protons produced by extra-Galactic sources. For a…Boaz Katz, Ran Budnik, Eli Waxman·Nov 24, 2008SaveLearn
First detection of glycolaldehyde outside the Galactic CenterGlycolaldehyde is the simplest of the monosaccharide sugars and is directly linked to the origin of life. We report on the detection of glycolaldehyde (CH2OHCHO) towards the hot molecular core…M. T. Beltran, C. Codella, S. Viti et al.·Nov 24, 2008SaveLearn
Relative astrometry of the J=1-0, v=1 and v=2 SiO masers towards R Leonis Minoris using VERAOxygen-rich Asymptotic Giant Branch (AGB) stars are intense emitters of SiO and H2O maser lines at 43 (J=1-0, v=1 and 2) and 22 GHz, respectively. VLBI observations of the maser emission provides…M. J. Rioja, R. Dodson, R. Kamohara et al.·Nov 24, 2008SaveLearn
Solar-like oscillations in the G8 V star tau CetiWe used HARPS to measure oscillations in the low-mass star tau Cet. Although the data were compromised by instrumental noise, we have been able to extract the main features of the oscillations. We…T. C. Teixeira, H. Kjeldsen, T. R. Bedding et al.·Nov 24, 2008SaveLearn
The Geneva-Copenhagen Survey of the Solar neighbourhood III. Improved distances, ages, and kinematicsAges, chemical compositions, velocity vectors, and Galactic orbits for stars in the solar neighbourhood are fundamental test data for models of Galactic evolution. We aim to improve the accuracy of…J. Holmberg, B. Nordström, J. Andersen·Nov 24, 2008SaveLearn
Rotational mixing in tidally locked massive main-sequence binariesOne of the main uncertainties in evolutionary calculations of massive stars is the efficiency of internal mixing. It changes the chemical profile inside the star and can therefore affect the…S. E. de Mink, M. Cantiello, N. Langer et al.·Nov 24, 2008SaveLearn
The COSMOS AGN Spectroscopic Survey I: XMM CounterpartsWe present optical spectroscopy for an X-ray and optical flux-limited sample of 677 XMM-Newton selected targets covering the 2 deg2 COSMOS field, with a yield of 485 high-confidence redshifts. The…Jonathan R. Trump, Chris D. Impey, Martin Elvis et al.·Nov 24, 2008SaveLearn
Four New Stellar Debris Streams in the Galactic HaloWe report on the detection of four new stellar debris streams and a new dwarf galaxy candidate in the Sloan Digital Sky Survey. Three of the streams, ranging between 3 and 15 kpc in distance and…Carl J. Grillmair·Nov 24, 2008SaveLearn
Detection of CI in absorption towards PKS 1830-211 with the eSMAWe report the first science observations and results obtained with the "extended" SMA (eSMA), which is composed of the SMA (Submillimeter Array), JCMT (James Clerk Maxwell Telescope) and CSO…Sandrine Bottinelli, A. Meredith Hughes, Ewine F. van Dishoeck et al.·Nov 24, 2008SaveLearn
Three-dimensional modeling of the asymmetric blast wave from the 2006 outburst of RS Ophiuchi: Early X-ray emissionChandra/HETG observations of the recurrent nova RS Ophiuchi at day 13.9 of its 2006 outburst reveal a spectrum covering a large range in plasma temperature and characterized by asymmetric and…S. Orlando, J. J. Drake, J. M. Laming·Nov 24, 2008SaveLearn
The Composition of Dust in Jupiter-Family Comets as Inferred from Infrared SpectroscopyWe review the composition of Jupiter-family comet dust as inferred from infrared spectroscopy. We find that Jupiter-family comets have 10 micron silicate emission features with fluxes roughly 20-25%…Michael S. Kelley, Diane H. Wooden·Nov 24, 2008SaveLearn
A note on the theory of transverse diffusion in shock particle accelerationWe investigate the role of the form of the spatial diffusion coefficient in shock acceleration of fast particles. Referring to non-classical diffusion and using the results of numerical (hybrid)…R. A. Treumann·Nov 24, 2008SaveLearn
The optical/X-ray connection: ICM iron content and galaxy optical luminosity in 20 galaxy clustersX-ray observations of galaxy clusters have shown that the intra-cluster gas has iron abundances of about one third of the solar value. These observations also show that part (if not all) of the…T. F. Lagana, R. A. Dupke, L. Sodre et al.·Nov 24, 2008SaveLearn