The astronomical unitsThe IAU-1976 System of astronomical constants includes three astronomical units (i.e. for time, mass and length). This paper reports on the status of the astronomical unit of length (ua) and mass…N. Capitaine, B. Guinot·Dec 16, 2008SaveLearn
The Northern Sky Optical Cluster Survey III: A Cluster Catalog Covering Pi SteradiansWe present the complete galaxy cluster catalog from the Northern Sky Optical Cluster Survey, a new, objectively defined catalog of candidate galaxy clusters at z<0.25 drawn from the Digitized Second…R. R. Gal, P. A. A. Lopes, R. R. de Carvalho et al.·Dec 16, 2008SaveLearn
Fermi LAT Observations of the Vela PulsarThe Vela pulsar is the brightest persistent source in the GeV sky and thus is the traditional first target for new gamma-ray observatories. We report here on initial Fermi Large Area Telescope…A. A. Abdo·Dec 16, 2008SaveLearn
Pattern Speeds and Galaxy MorphologyThe morphology of a disk galaxy is closely linked to its kinematic state. This is because density wave features are likely made of spontaneously-formed modes which are allowed to arise in the…R. Buta, X. Zhang·Dec 16, 2008SaveLearn
Spitzer Planet Limits around the Pulsating White Dwarf GD66We present infrared observations in search of a planet around the white dwarf, GD66. Time-series photometry of GD66 shows a variation in the arrival time of stellar pulsations consistent with the…Fergal Mullally, William T. Reach, Steven Degennaro et al.·Dec 16, 2008SaveLearn
Ground-based calibration and characterization of the Fermi Gamma-Ray Burst Monitor DetectorsOne of the scientific objectives of NASA's Fermi Gamma-ray Space Telescope is the study of Gamma-Ray Bursts (GRBs). The Fermi Gamma-Ray Burst Monitor (GBM) was designed to detect and localize…Elisabetta Bissaldi, Andreas von Kienlin, Giselher G. Lichti et al.·Dec 16, 2008SaveLearn
One Dimensional Dynamical Models of the Carina Nebula BubbleWe have tested the two main theoretical models of bubbles around massive star clusters, Castor et al. and Chevalier & Clegg, against observations of the well studied Carina Nebula. The Castor et al.…E. Harper-Clark, N. Murray·Dec 16, 2008SaveLearn
Swift-UVOT captures the earliest ultraviolet spectrum of a Gamma Ray BurstWe present the earliest ever ultraviolet spectrum of a gamma-ray burst (GRB) as observed with the Swift-UVOT. The GRB 081203A spectrum was observed for 50 seconds with the UV grism starting 251…N. P. M. Kuin, W. B. Landsman, M. J. Page et al.·Dec 15, 2008SaveLearn
The Gravitational Shear--Intrinsic Ellipticity Correlation Functions of Luminous Red Galaxies in Observation and in the ΛCDM ModelWe examine whether the gravitational shear--intrinsic ellipticity (GI) correlation function of the luminous red galaxies (LRGs) can be modeled with the distribution function of a misalignment angle…Teppei Okumura, Y. P. Jing·Dec 15, 2008SaveLearn
Balancing the Energy Budget between Star-Formation and AGN in High Redshift Infrared Luminous Galaxies(abridged) We present deep Spitzer mid-infrared spectroscopy, along with 16, 24, 70, and 850um photometry, for 22 galaxies located in GOODS-N. The sample spans a redshift range of 0.6 < z < 2.6, 24um…E. J. Murphy, R. -R. Chary, D. M. Alexander et al.·Dec 15, 2008SaveLearn
Photo-heating and supernova feedback amplify each other's effect on the cosmic star formation ratePhoto-heating associated with reionisation and kinetic feedback from core-collapse supernovae have previously been shown to suppress the high-redshift cosmic star formation rate. Here we investigate…Andreas H. Pawlik, Joop Schaye·Dec 15, 2008SaveLearn
A refined model for spinning dust radiationWe present a comprehensive treatment of the spectrum of electric dipole emission from spinning dust grains, updating the commonly used model of Draine and Lazarian. Grain angular velocity…Y. Ali-Haïmoud, C. M. Hirata, C. Dickinson·Dec 15, 2008SaveLearn
Light propagation in statistically homogeneous and isotropic dust universesWe derive the redshift and the angular diameter distance in rotationless dust universes which are statistically homogeneous and isotropic, but have otherwise arbitrary geometry. The calculation from…Syksy Rasanen·Dec 15, 2008SaveLearn
Mid-Infrared Extinction Mapping of Infrared Dark Clouds: Probing the Initial Conditions for Massive Stars and Star Clusters(Abridged) We use 8 micron Spitzer GLIMPSE images to make extinction maps of 10 IRDCs, selected to be relatively nearby and massive. The extinction mapping technique requires modeling the IR…Michael J. Butler, Jonathan C. Tan·Dec 15, 2008SaveLearn
Statefinder analysis of universe models with a viscous cosmic fluid and a fluid with a non-linear equation of stateIn the present article we analyze, by means of the statefinder parameter formalism, some universe models introduced by Brevik and co-workers. We determine constants that earlier were left…Oyvind Gron·Dec 15, 2008SaveLearn
Molecular Superbubbles and Outflows from Starburst Galaxy NGC 2146We present results from a deep (1 sigma = 5.7 mJy beam-1 per 20.8 km s-1 velocity channel) 12CO(1-0) interferometric observation of the central 60" region of the nearby edge-on starburst…An-Li Tsai, Satoki Matsushita, Kouichiro Nakanishi et al.·Dec 15, 2008SaveLearn
Detecting Dark Matter annihilation lines with FermiDark matter constitutes one of the most intriguing but so far unresolved issues in physics today. In many extensions of the Standard Model the existence of a stable Weakly Interacting Massive…Tomi Ylinen, Yvonne Edmonds, Elliott D. Bloom et al.·Dec 15, 2008SaveLearn
Reconstructing Cosmological Matter Perturbations using Standard Candles and RulersFor a large class of dark energy (DE) models, for which the effective gravitational constant is a constant and there is no direct exchange of energy between DE and dark matter (DM), knowledge of the…Ujjaini Alam, Varun Sahni, Alexei A. Starobinsky·Dec 15, 2008SaveLearn
Rings, spirals and manifoldsTwo-armed, grand design spirals and inner and outer rings in barred galaxies can be due to orbits guided by the manifolds emanating from the vicinity of the L1 and L2 Lagrangian points, located at…E. Athanassoula, M. Romero-Gomez, J. J. Masdemont·Dec 15, 2008SaveLearn
Constraints on Primordial Non-Gaussianity from a Needlet Analysis of the WMAP-5 DataWe look for a non-Gaussian signal in the WMAP 5-year temperature anisotropy maps by performing a needlet-based data analysis. We use the foreground-reduced maps obtained by the WMAP team through the…Davide Pietrobon, Paolo Cabella, Amedeo Balbi et al.·Dec 15, 2008SaveLearn
Overdensities of galaxies at z ~ 3.7 in CDF-SWe report the discovery of possible overdensities of galaxies at z ~ 3.7 in the Chandra Deep Field South (CDF-S). These overdensities are identified from the photometric redshift selected sample, and…Eugene Kang, Myungshin Im·Dec 15, 2008SaveLearn
Testing the blast wave model with Swift GRBsThe complex structure of the light curves of Swift GRBs has made the identification of breaks, and the interpretation of the blast wave caused by the burst, more difficult than in the pre-Swift era.…P. A. Curran, R. L. C. Starling, A. J. van der Horst et al.·Dec 15, 2008SaveLearn
Boson stars with repulsive selfinteractionsThe properties of compact stars made of massive bosons with a repulsive selfinteraction mediated by vector mesons are studied within the mean-field approximation and general relativity. We…Pratik Agnihotri, Juergen Schaffner-Bielich, Igor N. Mishustin·Dec 15, 2008SaveLearn
Radiative Feedback in Relic HII Regions at High-RedshiftUV radiation from early astrophysical sources could have a large impact on subsequent star formation in nearby protogalaxies. Here we study the radiative feedback from the first, short-lived stars…Andrei Mesinger, Greg L. Bryan, Zoltan Haiman·Dec 15, 2008SaveLearn
New Limits on Sterile Neutrinos from Suzaku Observations of the Ursa Minor Dwarf Spheroidal GalaxyWe present results of our search for X-ray line emission associated with the radiative decay of the sterile neutrino, a well-motivated dark matter candidate, in Suzaku Observatory spectra of the Ursa…Michael Loewenstein, Alexander Kusenko, Peter L. Biermann·Dec 15, 2008SaveLearn