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Astrophysics papers

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On binary pulsars and the force of gravity
The energy-momentum budget of the astrophysical systems can be studied by the exact local conservation equation derived by Landau and Lifshitz. We show that a similar equation is valid for the…
Davor PalleMay 19, 2026
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Tidal torques. A critical review of some techniques
We point out that the MacDonald formula for body-tide torques is valid only in the zeroth order of e/Q, while its time-average is valid in the first order. So the formula cannot be used for analysis…
Michael Efroimsky, James G. WilliamsAug 26, 2012
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Dynamics of a Spherical Accretion Shock with Neutrino Heating and Alpha-Particle Recombination
We investigate the effects of neutrino heating and alpha-particle recombination on the hydrodynamics of core-collapse supernovae. Our focus is on the non-linear dynamics of the shock wave that forms…
Rodrigo Fernández, Christopher ThompsonDec 30, 2008
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Asymptotically FRW black holes
Application of concepts like black hole and event horizon in cosmological context are not trivial, as has been shown in the last decade. We introduce special solutions of the LTB family representing…
J. T. Firouzjaee, Reza MansouriDec 30, 2008
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Reaction of Accretion Disks to Abrupt Mass Loss During Binary Black Hole Merger
The association of an electromagnetic signal with the merger of a pair of supermassive black holes would have many important implications. For example, it would provide new information about gas and…
Sean M. O'Neill, M. Coleman Miller, Tamara Bogdanovic et al.Dec 30, 2008
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A Gamma-Ray Burst/Pulsar for Cosmic-Ray Positrons with a Dark Matter-like Spectrum
We propose that a nearby gamma-ray burst (GRB) or GRB-like (old, single and short-lived) pulsar/supernova remnant/microquasar about 105-6 years ago may be responsible for the excesses of…
Kunihito IokaDec 30, 2008
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Catastrophic Photo-z Errors and the Dark Energy Parameter Estimates with Cosmic Shear
We study the impact of catastrophic errors occurring in the photometric redshifts of galaxies on cosmological parameter estimates with cosmic shear tomography. We consider a fiducial survey with…
L. Sun, Z. -H. Fan, C. Tao et al.Dec 30, 2008
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Ultraviolet Spectra of Local Galaxies and their Link with the High-z Population
The new generation of 8 to 10m class telescope is providing us with high-quality spectral information on the rest-frame ultraviolet region of star-forming galaxies at cosmological distances. The data…
Claus LeithererDec 30, 2008
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Biases and Uncertainties in Physical Parameter Estimates of Lyman Break Galaxies from Broad-band Photometry
We investigate the biases and uncertainties in estimates of physical parameters of high-redshift Lyman break galaxies (LBGs), such as stellar mass, mean stellar population age, and star formation…
Seong-Kook Lee, Rafal Idzi, Henry C. Ferguson et al.Dec 30, 2008
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Stellar Ages from Stellar Rotation
Our ability to determine stellar ages from measurements of stellar rotation, hinges on how well we can measure the dependence of rotation on age for stars of different masses. Rotation periods for…
Soren MeibomDec 30, 2008
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An Evolutionary Considerations for V228 from 47 Tuc
We perform evolutionary calculations of binary stars to find progenitors of system with parameters similar to the eclipsing binary system V228. We show that a V228 binary system may be formed…
Marek J. SarnaDec 30, 2008
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Source region of the 2003 November 18 CME that led to the strongest magnetic storm of cycle 23
The super-storm of November 20, 2003 was associated with a high speed coronal mass ejection which originated in the NOAA AR 10501 on November 18. This coronal mass ejection had severe terrestrial…
N. Srivastava, S. Mathew, R. Louis et al.Dec 30, 2008
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Further progress on solar age calibration
We recalibrate a standard solar model seismologically to estimate the main-sequence age of the Sun. Our procedure differs from what we have done in the past by removing from the observed frequencies…
Günter Houdek, Douglas GoughDec 30, 2008
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Bulk viscosity of strange matter and r-modes in neutron stars
We discuss bulk viscosity due to non-leptonic processes involving hyperons and Bose-Einstein condensate of negatively charged kaons in neutron stars. It is noted that the hyperon bulk viscosity…
Debarati Chatterjee, Debades BandyopadhyayDec 30, 2008
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Necessity of Dark Matter in Modified Newtonian Dynamics within Galactic Scales? - Testing the Covariant MOND in Elliptical Lenses
Modified Newtonian Dynamics (MOND) and its relativistic version - TeVeS offer us an alternative perspective to understand the universe without the demand of the elusive cold dark matter. This MONDian…
M. C. Chiu, Y. Tian, C. M. KoDec 30, 2008
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Origin of Europa and the Galilean Satellites
Europa is believed to have formed near the very end of Jupiter's own accretion, within a circumplanetary disk of gas and solid particles. We review the formation of the Galilean satellites in the…
Robin M. Canup, William R. WardDec 30, 2008
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Correlated variability in the blazar 3C 454.3
The blazar 3C 454.3 was revealed by the Fermi Gamma-ray Space Telescope to be in an exceptionally high flux state in July 2008. Accordingly, we performed a multi-wavelength monitoring campaign on…
E. W. Bonning, C. Bailyn, C. M. Urry et al.Dec 30, 2008
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Compressed sensing imaging techniques for radio interferometry
Radio interferometry probes astrophysical signals through incomplete and noisy Fourier measurements. The theory of compressed sensing demonstrates that such measurements may actually suffice for…
Y. Wiaux, L. Jacques, G. Puy et al.Dec 29, 2008
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Detecting Solar Neutrino Flare in Megaton and km3 detectors
To foresee a solar flare neutrino signal we infer its upper and lower bound. The upper bound was derived since a few years by general energy equipartition arguments on observed solar particle flare.…
Daniele Fargion, Paola Di GiacomoDec 29, 2008
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Untwisting magnetospheres of neutron stars
Magnetospheres of neutron stars are anchored in the rigid crust and can be twisted by sudden crustal motions ("starquakes"). The twisted magnetosphere does not remain static and gradually…
Andrei M. BeloborodovDec 29, 2008
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High Accuracy Near-infrared Imaging Polarimetry with NICMOS
The findings of a nine orbit calibration plan carried out during HST Cycle 15, to fully determine the NICMOS camera 2 (2.0 micron) polarization calibration to high accuracy, are reported. Recently…
D. Batcheldor, G. Schneider, D. C. Hines et al.Dec 29, 2008
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Active Galactic Nuclei, Radio Jets and Acceleration of UHECRs
We present the general properties of the Active Galactic Nuclei (AGNs) and discuss the origin and structure of jets that are associated to a fraction of these objects. We then we address the problems…
S. MassagliaDec 29, 2008
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Measuring interstellar magnetic fields by radio synchrotron emission
Radio synchrotron emission, its polarization and its Faraday rotation are powerful tools to study the strength and structure of interstellar magnetic fields. The total intensity traces the strength…
Rainer BeckDec 29, 2008
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The CHilean Automatic Supernova sEarch (CHASE)
The CHASE project started in 2007 with the aim of providing young southern supernovae (SNe) to the Carnegie Supernova Project (CSP) and Millennium Center for Supernova Studies (MCSS) follow-up…
G. Pignata, J. Maza, M. Hamuy et al.Dec 29, 2008
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Friedmann cosmology with bulk viscosity: a concrete model for dark energy
The universe content is considered as a non-perfect fluid with bulk viscosity and can be described by a general equation of state (endowed some deviation from the conventionally assumed cosmic…
X H Meng, X DouDec 29, 2008
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