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Astrophysics papers — page 96

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NOIRCAT - The Northern HIPASS Optical/IR Catalogue
We present the Northern HIPASS Optical/InfraRed CATalogue (NOIRCAT), an optical/near-infrared counterpart to the Northern HIPASS catalogue (NHICAT). Of the 1002 sources in NHICAT, 655 (66%) have…
O. Ivy Wong, Rachel Webster, Virginia Kilborn et al.Oct 8, 2008
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Absolute properties of the low-mass eclipsing binary CM Draconis
Spectroscopic and eclipsing binary systems offer the best means for determining accurate physical properties of stars, including their masses and radii. The data available for low-mass stars have…
J. C. Morales, I. Ribas, C. Jordi et al.Oct 8, 2008
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On the accuracy of the high redshift cluster luminosity function
We study the reliability of the statistical background subtraction method for computing the Ks-band luminosity function of cluster galaxies at z~1 using mock Red-sequence Cluster Survey cluster…
Roberto P. Muñoz, Nelson D. Padilla, Luis F. BarrientosOct 8, 2008
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Levy Flights of Binary Orbits due to Impulsive Encounters
We examine the evolution of an almost circular Keplerian orbit interacting with unbound perturbers. We calculate the change in eccentricity and angular momentum that results from a single encounter,…
Benjamin F. Collins, Re'em SariOct 8, 2008
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The 2007 outburst of the X-ray binary XTE J1856+053
On 28 February 2007 a new outburst of the previously known transient source XTE J1856+053 was detected with RXTE/ASM. We present here the results of an XMM-Newton (0.5-10.0 keV) Target of Opportunity…
G. Sala, J. Greiner, M. Ajello et al.Oct 8, 2008
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Long-Term Evolution of and X-ray Emission from a Recoiling Supermassive Black Hole in a Disk Galaxy
Recent numerical relativity simulations have shown that the emission of gravitational waves at the merger of two black holes gives a recoil kick to the final black hole. We follow the orbits of a…
Yutaka FujitaOct 8, 2008
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Suzaku Observations of Cyg X-1
We present highlights from a series of four simultaneous Suzaku/RXTE observations of the black hole candidate Cyg X-1. We briefly summarize several key results from our decade long RXTE monitoring…
Michael A. NowakOct 8, 2008
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The star clusters of the Magellanic System
More than 50 years have elapsed since the first studies of star clusters in the Magellanic Clouds. The wealth of data accumulated since then has not only revealed a large cluster system, but also a…
B. X. SantiagoOct 8, 2008
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On the birthrates of Galactic neutron stars
In light of the recently discovered neutron star populations we discuss the various estimates for the birthrates of these populations. We revisit the question as to whether the Galactic supernova…
E. F. Keane, M. KramerOct 8, 2008
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Systemic Proper Motions of Milky Way Satellites from Stellar Redshifts: the Carina, Fornax, Sculptor and Sextans Dwarf Spheroidals
The transverse motions of nearby dwarf spheroidal (dSph) galaxies contribute line-of-sight components that increase with angular distance from the dSph centers, inducing detectable gradients in…
Matthew G. Walker, Mario Mateo, Edward W. OlszewskiOct 8, 2008
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Pulsation in the atmosphere of roAp stars
High time resolution spectroscopy of roAp stars at large telescopes has led to a major breakthrough in our understanding of magnetoacoustic pulsations in these interesting objects. New observations…
O. KochukhovOct 8, 2008
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The star cluster system of the luminous elliptical galaxy NGC 1600
Luminous elliptical galaxies generally display a rich star cluster system, whose properties provide strong constraints on the physics of galaxy formation and evolution. Star cluster system studies,…
B. X. SantiagoOct 8, 2008
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Nova-Like Cataclysmic Variable TT Ari: QPO Behaviour Coming Back From Positive Superhumps
We study the variability of the nova-like cataclysmic variable TT Ari, on time-scales of between minutes and months. The observations in the filter R were obtained at the 40-cm telescope of the…
Y. Kim, I. L. Andronov, S. M. Cha et al.Oct 8, 2008
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SN 2001em: Not so Fast
SN 2001em is a peculiar supernova, originally classified as Type Ib/c. About two years after the SN it was detected in the radio, showing a rising radio flux with an optically thin spectral slope,…
F. K. Schinzel, G. B. Taylor, C. J. Stockdale et al.Oct 8, 2008
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The formation and assembly of a typical star-forming galaxy at z~3
Recent studies of galaxies ~2-3 Gyr after the Big Bang have revealed large, turbulent rotating systems. The existence of well-ordered rotation in galaxies during this peak epoch of cosmic star…
Daniel P. Stark, Mark Swinbank, Richard S. Ellis et al.Oct 8, 2008
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Individual GRB sensitivity of a cubic-kilometer deep-sea neutrino telescope KM3NeT
Gamma-ray bursts (GRB) are powerful and highly variable sources of gamma rays that indicate the existence of cosmic particle accelerators. Under the assumption of hadronic acceleration in the jet,…
D. Dornic, G. LelaizantOct 8, 2008
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Do all Flares have White Light Emission?
High-cadence, multiwavelength optical observations of a solar active region (NOAA 10969), obtained with the Swedish Solar Telescope, are presented. Difference imaging of white light continuum data…
D. B. Jess, M. Mathioudakis, P. J. Crockett et al.Oct 8, 2008
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Dyadosphere formed in gravitational collapse
We first recall the concept of Dyadosphere (electron-positron-photon plasma around a formed black holes) and its motivation, and recall on (i) the Dirac process: annihilation of electron-positron…
Remo Ruffini, She-Sheng XueOct 8, 2008
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Optical identification of a new cataclysmic variable from integral all sky survey: IGR J08390--4833
We have optically identified a recently discovered INTEGRAL source, IGR J08390--4833, with a cataclysmic variable, i.e. an accreting white dwarf in a binary system. The spectrum exhibits a rising…
M. Revnivtsev, A. Kniazev, S. Sazonov et al.Oct 8, 2008
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Neutrino detection of transient sources with optical follow-up observations
The ANTARES telescope has the opportunity to detect transient neutrino sources, such as gamma-ray bursts (GRBs), core-collapse supernovae (SNe), flares of active galactic nuclei (AGNs)... To enhance…
D. Dornic D, S. Basa, J. Brunner et al.Oct 8, 2008
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Magnetic Braiding and Parallel Electric Fields
The braiding of the solar coronal magnetic field via photospheric motions - with subsequent relaxation and magnetic reconnection -- is one of the most widely debated ideas of solar physics. We…
A. L. Wilmot-Smith, G. Hornig, D. I. PontinOct 8, 2008
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Optical and near-IR photometric study of the open cluster NGC 637 and NGC 957
We present UBVRI CCD photometry in the region of the open clusters NGC 637 and NGC 957. The radii are found to be 4.2 arcmin and 4.3 arcmin. Their reddenings E(B-V) are 0.64+/-0.05 mag and…
R. K. S. Yadav, Brijesh Kumar, A. Subramaniam et al.Oct 8, 2008
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Is the Scaling of Supersonic Turbulence Universal?
The statistical properties of turbulence are considered to be universal at sufficiently small length scales, i. e., independent of boundary conditions and large-scale forces acting on the fluid.…
Wolfram Schmidt, Christoph Federrath, Ralf KlessenOct 8, 2008
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Neutrino alert systems for Gamma Ray Bursts and Transient astronomical Sources
GRBs are the most energetic events in the Universe, associated with the death of massive stars (core-collapse supernovae) or the merging of neutron stars or black holes. Discovered in the early…
Stephane Basa, Damien Dornic, Gabrielle Lelaizant et al.Oct 8, 2008
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Disk masses in the embedded and T Tauri phases of stellar evolution
(Abridged). Motivated by a growing concern that masses of circumstellar disks may have been systematically underestimated by conventional observational methods, we present a numerical hydrodynamics…
E. I. VorobyovOct 8, 2008
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