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Showing 2007Show all

399 papers · 1 filter

astro-ph2007★ 54 cited

GRB 070201: A possible Soft Gamma Ray Repeater in M31

E. O. Ofek, M. Muno, R. Quimby +13

The gamma-ray burst (GRB) 070201 was a bright short-duration hard-spectrum GRB detected by the Inter-Planetary Network (IPN). Its error quadrilateral, which has an area of 0.124 sq…

physics.atom-ph2007★ 2 cited

Site-resolved Bragg scattering

Birjoo Vaishnav, David S. Weiss

We numerically calculate the reliability with which one can optically determine the presence or absence of an individual scatterer in a randomly occupied 3D array of well-localized…

math-ph2007★ 20 cited

Long time behaviour for a class of low-regularity solutions of the Camassa-Holm equation

Luen-Chau Li

In this paper, we investigate the long time behaviour for a class of low-regularity solutions of the Camassa-Holm equation given by the superposition of infinitely many interacting…

hep-ph2007★ 3 cited

Toward an effective centrality trigger in pp collisions at LHC

H. J. Drescher, M. Strikman

We investigate the impact of very strong small x gluon fields in colliding nucleons at LHC energies on the interaction of valence quarks. We find that in the range of small impact…

astro-ph2007★ 43 cited

BAT X-ray Survey - I: Methodology and X-ray Identification

M. Ajello, J. Greiner, G. Kanbach +3

We applied the Maximum Likelihood method, as an image reconstruction algorithm, to the BAT X-ray Survey (BXS). This method was specifically designed to preserve the full statistica…

astro-ph2007★ 65 cited

Infrared and X-Ray Evidence for Circumstellar Grain Destruction by the Blast Wave of Supernova 1987A

E. Dwek, R. G. Arendt, P. Bouchet +10

Multiwavelength observations of supernova remnant (SNR) 1987A show that its morphology and luminosity are rapidly changing at X-ray, optical, infrared, and radio wavelengths as the…

cond-mat.stat-mech2007★ 17 cited

Symmetry, shape, and order

Antonio Trovato, Trinh X. Hoang, Jayanth R. Banavar +1

Packing problems have been of great interest in many diverse contexts for many centuries. The optimal packing of identical objects has been often invoked to understand the nature o…

gr-qc2007★ 112 cited

A gravitational-wave probe of effective quantum gravity

Stephon Alexander, Lee Samuel Finn, Nicolas Yunes

The Green-Schwarz anomaly-cancelling mechanism in string theories requires a Chern-Simons term in the Einstein-Hilbert action, which leads to an amplitude birefringence of spacetim…

cs.IT2007★ 220 cited

Rethinking Information Theory for Mobile Ad Hoc Networks

Jeff Andrews, Nihar Jindal, Martin Haenggi +8

The subject of this paper is the long-standing open problem of developing a general capacity theory for wireless networks, particularly a theory capable of describing the fundament…

q-bio.BM2007★ 34 cited

Structural motifs of biomolecules

Jayanth R. Banavar, Trinh X. Hoang, John H. Maddocks +4

Biomolecular structures are assemblies of emergent anisotropic building modules such as uniaxial helices or biaxial strands. We provide an approach to understanding a marginally co…

astro-ph2007

The PSU/TCfA Search for Planets around Evolved Stars. Stellar parameters and activity indicators of targets

Andrzej Niedzielski, Grzegorz Nowak, Pawel Zielinski

The main objective of the Penn State/Torun Centre for Astronomy Search for Planets around Evolved Stars is the detection of planetary systems around massive, evolved stars. We are…

astro-ph2007★ 8 cited

A HET search for planets around evolved stars

Andrzej Niedzielski, Alex Wolszczan

We present our ongoing survey of ~1000 GK-giants with the 9.2-m Hobby-Eberly Telescope in search for planets around evolved stars. The stars selected for this survey are brighter t…

astro-ph2007★ 18 cited

Do broad absorption line quasars live in different environments from ordinary quasars?

Yue Shen, Michael A. Strauss, Patrick B. Hall +3

We select a sample of traditionally defined broad absorption line quasars (BALQs) from the Fifth Data Release quasar catalog of the Sloan Digital Sky Survey. For a stat…

astro-ph2007★ 147 cited

Quasar Broad Absorption Line Variability on Multi-Year Time Scales

Robert R. Gibson, W. N. Brandt, Donald P. Schneider +1

We use quantitative metrics to characterize the variation of CIV 1549 A broad absorption lines (BALs) over 3--6 (rest-frame) years in a sample of 13 quasars at 1.7 <= z <= 2.8 and…

gr-qc2007★ 78 cited

Perturbations of Schwarzschild Black Holes in Chern-Simons Modified Gravity

Nicolas Yunes, Carlos F. Sopuerta

We study perturbations of a Schwarzschild black hole in Chern-Simons modified gravity. We begin by showing that Birkhoff's theorem holds for a wide family of Chern-Simons coupling…

math.ST2007★ 21 cited

On surrogate dimension reduction for measurement error regression: An invariance law

Bing Li, Xiangrong Yin

We consider a general nonlinear regression problem where the predictors contain measurement error. It has been recently discovered that several well-known dimension reduction metho…

astro-ph2007★ 12 cited

GRB 070724B: the first Gamma Ray Burst localized by SuperAGILE and its Swift X-ray Afterglow

E. Del Monte, M. Feroci, L. Pacciani +51

GRB 070724B is the first Gamma Ray Burst localized by SuperAGILE, the hard X-ray monitor aboard the AGILE satellite. The coordinates of the event were published hours aft…

cond-mat.other2007★ 129 cited

Two-phonon coupling to the antiferromagnetic phase transition in multiferroic BiFeO3

Mariola O. Ramirez, M. Krishnamurthi, S. Denev +11

A prominent band centered at around 1000-1300 cm-1 and associated with resonant enhancement of two-phonon Raman scattering is reported in multiferroic BiFeO3 thin films and single…

astro-ph2007★ 17 cited

Suzaku X-Ray Spectroscopy of a Peculiar Hot Star in the Galactic Center Region

Yoshiaki Hyodo, Masahiro Tsujimoto, Katsuji Koyama +5

We present the results of a Suzaku study of a bright point-like source in the 6.7 keV intensity map of the Galactic center region. We detected an intense FeXXV 6.7 keV line with an…

astro-ph2007★ 112 cited

A Massive Neutron Star in the Globular Cluster M5

Paulo C. C. Freire, Alex Wolszczan, Maureen van den Berg +1

We report the results of 19 years of Arecibo timing for two pulsars in the globular cluster NGC 5904 (M5), PSR B1516+02A (M5A) and PSR B1516+02B (M5B). This has resulted in the mea…

astro-ph2007★ 93 cited

Polarized NIR and X-ray Flares from SgrA*

A. Eckart, F. K. Baganoff, M. Zamaninasab +18

Stellar dynamics indicate the presence of a super massive 3-4x10^6 Msun solm black hole at the Galactic Center. It is associated with the variable radio, near-infrared, and X-ray c…

astro-ph2007★ 218 cited

An X-ray, IR, and Submillimeter Flare of Sagittarius A*

D. P. Marrone, F. K. Baganoff, M. R. Morris +14

Energetic flares are observed in the Galactic supermassive black hole Sagittarius A* from radio to X-ray wavelengths. On a few occasions, simultaneous flares have been detected in…

astro-ph2007★ 374 cited

Correlation of the highest-energy cosmic rays with the positions of nearby active galactic nuclei

The Pierre Auger Collaboration

Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of the cosmic rays with the highest energies, which are correlated with the…

gr-qc2007★ 63 cited

Search of S3 LIGO data for gravitational wave signals from spinning black hole and neutron star binary inspirals

The LIGO Scientific Collaboration, B. Abbott

We report on the methods and results of the first dedicated search for gravitational waves emitted during the inspiral of compact binaries with spinning component bodies. We analyz…