Skip to content

Astrophysics papers — page 17

astro-phBrowse archive

Superfluid signatures in magnetar seismology
We investigate the role of neutron star superfluidity for magnetar oscillations. Using a plane-wave analysis we estimate the effects of a neutron superfluid in the elastic crust region. We…
N. Andersson, K. Glampedakis, L. SamuelssonDec 12, 2008
Learn
Observations of the cataclysmic variable SDSS J081321.91+452809.4
Our observations of the first reported outburst of SDSS J081321.91+452809.4 during 2008 April show that this cataclysmic variable is a dwarf nova. The outburst amplitude was at least 3.1 magnitudes…
Jeremy Shears, Ian Miller, Steve BradyDec 12, 2008
Learn
The rotation and coma profiles of comet C/2004 Q2 (Machholz)
Aims. Rotation periods of cometary nuclei are scarce, though important when studying the nature and origin of these objects. Our aim is to derive a rotation period for the nucleus of comet C/2004 Q2…
Maarten Reyniers, Pieter Degroote, Dennis Bodewits et al.Dec 12, 2008
Learn
Discovery of slow X-ray pulsations in the high-mass X-ray binary 4U 2206+54
The source 4U 2206+54 is one of the most enigmatic high-mass X-ray binaries. In spite of intensive searches, X-ray pulsations have not been detected in the time range 0.001-1000 s. A cyclotron line…
P. Reig, J. M Torrejon, I. Negueruela et al.Dec 12, 2008
Learn
On the apsidal motion of BP Vulpeculae
BP Vulpeculae is a bright eclipsing binary system showing apsidal motion. It was found in an earlier study that it shows retrograde apsidal motion which contradicts theory. In this paper we present…
Sz. Csizmadia, E. Illes-Almar, T. BorkovitsDec 12, 2008
Learn
The star formation process in the Magellanic Clouds
The Magellanic Clouds offer unique opportunities to study star formation both on the global scales of an interacting system of gas-rich galaxies, as well as on the scales of individual star-forming…
J. M. OliveiraDec 12, 2008
Learn
Identifying nearby field T dwarfs in the UKIDSS Galactic Clusters Survey
We present the discovery of two new late-T dwarfs identified in the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Clusters Survey (GCS) Data Release 2 (DR2). These T dwarfs are nearby old T dwarfs…
N. Lodieu, B. Burningham, N. C. Hambly et al.Dec 12, 2008
Learn
Magnetic fields, winds and X-rays of massive stars in the Orion Nebula Cluster
In massive stars, magnetic fields are thought to confine the outflowing radiatively-driven wind, resulting in X-ray emission that is harder, more variable and more efficient than that produced by…
V. Petit, G. A. Wade, L. Drissen et al.Dec 12, 2008
Learn
The promise of Gaia and how it will influence stellar ages
The Gaia space project, planned for launch in 2011, is one of the ESA cornerstone missions, and will provide astrometric, photometric and spectroscopic data of very high quality for about one billion…
Carla CacciariDec 12, 2008
Learn
Optical SBFs of shell galaxies
We measure F814W Surface Brightness Fluctuations (SBFs) for a sample of distant shell galaxies observed with the Advanced Camera for Survey (ACS) on board of HST. To evaluate the distance at…
I. Biscardi, G. Raimondo, M. Cantiello et al.Dec 12, 2008
Learn
Post-processing the VLTI fringe-tracking data: First measurements of stars
At the Very Large Telescope Interferometer, the purpose of the fringe-tracker FINITO is to stabilize the optical path differences between the beams, allowing longer integration times on the…
Jean-Baptiste Le Bouquin, Roberto Abuter, Pierre Haguenauer et al.Dec 12, 2008
Learn
Strong field effects on pulsar arrival times: circular orbits and equatorial beams
If a pulsar orbits a supermassive black hole, the timing of pulses that pass close to the hole will show a variety of strong field effects. To compute the intensity and timing of pulses that have…
Yan Wang, Frederick A. Jenet, Teviet Creighton et al.Dec 12, 2008
Learn
Interpretation of Solar Magnetic Field Strength Observations
This study based on longitudinal Zeeman effect magnetograms and spectral line scans investigates the dependence of solar surface magnetic fields on the spectral line used and the way the line is…
R. K. Ulrich, L. Bertello, J. E. Boyden et al.Dec 12, 2008
Learn
Accelerated expansion through interaction
Interactions between dark matter and dark energy with a given equation of state are known to modify the cosmic dynamics. On the other hand, the strength of these interactions is subject to strong…
Winfried ZimdahlDec 12, 2008
Learn
The Black Hole Mass-Bulge Luminosity Relationship for Active Galactic Nuclei from Reverberation Mapping and Hubble Space Telescope Imaging
We investigate the relationship between black hole mass and bulge luminosity for AGNs with reverberation-based black hole mass measurements and bulge luminosities from two-dimensional decompositions…
Misty C. Bentz, Bradley M. Peterson, Richard W. Pogge et al.Dec 12, 2008
Learn
The Radius-Luminosity Relationship for Active Galactic Nuclei: The Effect of Host-Galaxy Starlight on Luminosity Measurements II. The Full Sample of Reverberation-Mapped AGNs
We present high-resolution HST images of all 35 AGNs with optical reverberation-mapping results, which we have modeled to create a nucleus-free image of each AGN host galaxy. From the nucleus-free…
Misty C. Bentz, Bradley M. Peterson, Hagai Netzer et al.Dec 12, 2008
Learn
Cosmological constraints on a light non-thermal sterile neutrino
Although the MiniBooNE experiment has severely restricted the possible existence of light sterile neutrinos, a few anomalies persist in oscillation data, and the possibility of extra light species…
Mario A. Acero, Julien LesgourguesDec 12, 2008
Learn
A 2MASS Analysis of the Stability of Southern Bok Globules
We used near-infrared 2MASS data to construct visual extinction maps of a sample of Southern Bok globules utilizing the NICE method. We derived radial extinction profiles of dense cores identified in…
Germán A. Racca, José W. S. Vilas-Boas, Ramiro de la RezaDec 11, 2008
Learn
Relativistic Simulations of Black Hole-Neutron Star Mergers: Effects of black-hole spin
Black hole-neutron star (BHNS) binary mergers are candidate engines for generating both short-hard gamma-ray bursts (SGRBs) and detectable gravitational waves. Using our most recent conformal…
Zachariah B. Etienne, Yuk Tung Liu, Stuart L. Shapiro et al.Dec 11, 2008
Learn
The excitation of spiral density waves through turbulent fluctuations in accretion discs I: WKBJ theory
We study and elucidate the mechanism of spiral density wave excitation in a differentially rotating turbulent flow. We formulate a set of wave equations with sources that are only non-zero in the…
T. Heinemann, J. C. B. PapaloizouDec 11, 2008
Learn
Reliability of the detection of the Baryon Acoustic Peak
The correlation function of the distribution of matter in the universe shows, at large scales, baryon acoustic oscillations, which were imprinted prior to recombination. This feature was first…
Vicent J. Martinez, Pablo Arnalte-Mur, Enn Saar et al.Dec 11, 2008
Learn
Turbulent magnetic fields in the quiet Sun: implications of Hinode observations and small-scale dynamo simulations
Using turbulent MHD simulations (magnetic Reynolds numbers up to 8000) and Hinode observations, we study effects of turbulence on measuring the solar magnetic field outside active regions. Firstly,…
Jonathan Pietarila Graham, Sanja Danilovic, Manfred SchuesslerDec 11, 2008
Learn
Interactions of Galaxies in the Galaxy Cluster Environment
We study the dependence of galaxy properties on the clustercentric radius and the environment attributed to the nearest neighbor galaxy using the SDSS galaxies associated with the Abell galaxy…
Changbom Park, Ho Seong HwangDec 11, 2008
Learn
Geometrical Diagnostics for Generalized Chaplygin Gas
A new diagnostic method, Om is applied to generalized Chaplygin gas (GCG) model as the unification of dark matter and dark energy. On the basis of the recently observed data: the Union supernovae,…
Jianbo Lu, Lixin XuDec 11, 2008
Learn
Model of Reconnection of Weakly Stochastic Magnetic Field and its Implications
We discuss the model of magnetic field reconnection in the presence of turbulence introduced by us approximately ten years ago. The model does not require any plasma effects to be involved in order…
A. Lazarian, E. VishniacDec 11, 2008
Learn
← PreviousPage 17Next →