The Keck Aperture Masking Experiment: spectro-interferometry of 3 Mira Variables from 1.1 to 3.8 micronsWe present results from a spectro-interferometric study of the Miras o Cet, R Leo and W Hya obtained with the Keck Aperture Masking Experiment from 1998 Sep to 2002 Jul. The spectrally dispersed…H. C. Woodruff, M. J. Ireland, P. G. Tuthill et al.·Nov 11, 2008SaveLearn
Stationary Configurations Imply Shift Symmetry: No Bondi Accretion for Quintessence / k-EssenceIn this paper we show that, for general scalar fields, stationary configurations are possible for shift symmetric theories only. This symmetry with respect to constant translations in field space…Ratindranath Akhoury, Christopher S. Gauthier, Alexander Vikman·Nov 11, 2008SaveLearn
Double Compact Objects as Low-frequency Gravitational Wave SourcesWe study the Galactic field population of double compact objects (NS-NS, BH-NS, BH-BH binaries) to investigate the number (if any) of these systems that can potentially be detected with LISA at low…Krzysztof Belczynski, Matthew Benacquista, Tomasz Bulik·Nov 10, 2008SaveLearn
The XMM-Newton long look of NGC 1365: uncovering of the obscured X-ray sourceWe present an analysis of the extreme obscuration variability observed during an XMM-Newton 5-days continuous monitoring of the AGN in NGC 1365. The source was in a reflection-dominated state in the…G. Risaliti, M. Salvati, M. Elvis et al.·Nov 10, 2008SaveLearn
The Signature of Galactic Tides in Local Group Dwarf Spheroidals(Abridged) We use N-body simulations to explore the effects of tidal stripping on the structure of dwarf spheroidal galaxies (dSphs). We model dSphs as King spheres embedded in NFW dark halos that…Jorge Penarrubia, Julio F. Navarro, Alan W. McConnachie et al.·Nov 10, 2008SaveLearn
Magnetohydrodynamic turbulence in supernova remnantsWe present estimates of the angular power spectra of the synchrotron radiation intensity fluctuations at 6 and 20 cm for the shell type supernova remnant Cas A and the filled-centre Crab supernova…Nirupam Roy, Somnath Bharadwaj, Prasun Dutta et al.·Nov 10, 2008SaveLearn
Birkhoff's theorem fails to save MOND from non-local physicsWe investigate the consequences of Birkhoff's theorem in general relativity (GR) and in Modified Newtonian dynamics (MOND). We study, in particular, the system of a finite-mass test particle…De-Chang Dai, Reijiro Matsuo, Glenn Starkman·Nov 10, 2008SaveLearn
Pulsar Wind Nebula candidates recently discovered by H.E.S.SH.E.S.S. is currently the most sensitive instrument in the very-high-energy gamma-ray domain and has revealed many new sources along the Galactic Plane, a significant fraction of which seems to be…M. Renaud, S. Hoppe, N. Komin et al.·Nov 10, 2008SaveLearn
On the nature of HESS J1503-582 revealed by the H.E.S.S. experiment: Coincidence with a FVW?The H.E.S.S. survey of the inner Galaxy in the very-high-energy gamma-ray domain has led to the discovery of many extended sources, some of which do not appear to be associated with any obvious…M. Renaud, P. Goret, R. C. G. Chaves·Nov 10, 2008SaveLearn
On the habitability of the OGLE-2006-BLG-109L planetary systemWe investigate the dynamics of putative Earth-mass planets in the habitable zone (HZ) of the extrasolar planetary system OGLE-2006-BLG-109L, a close analog of the Solar system. Our work is inspired…Cezary Migaszewski, Krzysztof Gozdziewski, Tobias C. Hinse·Nov 10, 2008SaveLearn
Multi-wavelength Calibration Procedure for the Pierre Auger Observatory Fluorescence DetectorsWe present a method to measure the relative spectral response of the Pierre Auger Observatory Fluorescence Detector. The calibration was done at wavelengths of 320, 337, 355, 380 and 405 nm using an…A. C. Rovero, P. Bauleo, J. T. Brack et al.·Nov 10, 2008SaveLearn
Spectral analysis of 636 white dwarf - M star binaries from the Sloan Digital Sky SurveyWe present a catalog of 857 white dwarf (WD)-M binaries from the sixth data release (DR6) of the Sloan Digital Sky Survey (SDSS), most of which were previously identified. For 636 of them, we…René Heller, Derek Homeier, Stefan Dreizler et al.·Nov 10, 2008SaveLearn
Scalar field cosmology in the energy phase-space -- unified description of dynamicsIn this letter we apply dynamical system methods to study all evolutional paths admissible for all initial conditions of the FRW cosmological model with a non-minimally coupled to gravity scalar…Marek Szydlowski, Orest Hrycyna·Nov 10, 2008SaveLearn
DR21 Main: A Collapsing CloudThe molecular cloud, DR21 Main, is an example of a large-scale gravitational collapse about an axis near the plane of the sky where the collapse is free of major disturbances due to rotation or other…Larry Kirby·Nov 10, 2008SaveLearn
Magnetic acceleration of ultra-relativistic jets in gamma-ray burst sourcesWe present a relativistic-MHD numerical study of axisymmetric, magnetically driven jets with parameters applicable to gamma-ray burst (GRB) flows. We also present analytic expressions for the…Serguei Komissarov, Nektarios Vlahakis, Arieh Konigl et al.·Nov 10, 2008SaveLearn
Magnetic field effects on neutrino production in microquasarsWe investigate the effects of magnetic fields on neutrino production in microquasars. We calculate the steady particle distributions for the pions and muons generated in p-gamma and p-p interactions…Matías M. Reynoso, Gustavo E. Romero·Nov 10, 2008SaveLearn
A new measurement of the cosmic X-ray backgroundWe present a new measurement of the cosmic X-ray background (CXRB) in the 1.5-7 keV energy band, performed by exploiting the Swift X-ray telescope (XRT) data archive. We also present a CXRB spectral…A. Moretti, C. Pagani, G. Cusumano et al.·Nov 10, 2008SaveLearn
Nobeyama Millimeter Array Observations of the Nuclear Starburst of M83: A GMA Scale Correlation between Dense Gas Fraction and Star Formation EfficiencyWe present aperture synthesis high-resolution (~ 7" x 3") observations in CO(J=1-0) line, HCN(J=1-0) line, and 95 GHz continuum emission toward the central (~ 1.5 kpc) region of the nearby…Kazuyuki Muraoka, Kotaro Kohno, Tomoka Tosaki et al.·Nov 10, 2008SaveLearn
Galaxy Mergers and Dark Matter Halo Mergers in LCDM: Mass, Redshift, and Mass-Ratio DependenceWe employ a high-resolution LCDM N-body simulation to present merger rate predictions for dark matter halos and investigate how common merger-related observables for galaxies--such as close pair…Kyle R. Stewart, James S. Bullock, Elizabeth J. Barton et al.·Nov 10, 2008SaveLearn
Three-Dimensional Simulations of Tidally Disrupted Solar-Type Stars and the Observational Signatures of Shock BreakoutWe describe a three-dimensional simulation of a 1 M solar-type star approaching a 106 M black hole on a parabolic orbit with a pericenter distance well within the tidal radius.…James Guillochon, Enrico Ramirez-Ruiz, Stephan Rosswog et al.·Nov 10, 2008SaveLearn
The Origin of the 24-micron Excess in Red GalaxiesObservations with the Spitzer Space Telescope have revealed a population of red-sequence galaxies with a significant excess in their 24-micron emission compared to what is expected from an old…Kate Brand, John Moustakas, Lee Armus et al.·Nov 10, 2008SaveLearn
Constraining the star formation histories of GRB Host Galaxies from their observed abundance patternsLong-duration Gamma Ray Bursts (GRBs) are linked to the collapse of massive stars and their hosts are exclusively identified as active, star forming galaxies. Four long GRBs observed at high spectral…F. Calura, M. Dessauges-Zavadsky, J. X. Prochaska et al.·Nov 10, 2008SaveLearn
Hierarchical Phase Space Structure of Dark Matter Haloes: Tidal debris, Caustics, and Dark Matter annihilationMost of the mass content of dark matter haloes is expected to be in the form of tidal debris. The density of debris is not constant, but rather can grow due to formation of caustics at the apocenters…Niayesh Afshordi, Roya Mohayaee, Edmund Bertschinger·Nov 10, 2008SaveLearn
Spitzer Observations of L429: A Near-collapse or Collapsing Starless CoreWe present Spitzer infrared observations of the starless core L429. The IR images of this core show an absorption feature, caused by the dense core material, at wavelengths <= 70 micron. The core has…Amelia M. Stutz, Tyler L. Bourke, George H. Rieke et al.·Nov 10, 2008SaveLearn
Time-resolved spectral correlations of long-duration Gamma-Ray BurstsFor a sample of long GRBs with known redshift, we study the distribution of the evolutionary tracks on the rest-frame luminosity-peak energy Liso-Ep' diagram. We are interested in exploring the…C. Firmani, J. I. Cabrera, V. Avila-Reese et al.·Nov 10, 2008SaveLearn