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23 papers · 2 filters
Activity from Magnetar Candidate 4U 0142+61: Bursts and Emission Lines
Fotis P. Gavriil, Rim. Dib, Victoria M. Kaspi
After 6 years of quiescence, Anomalous X-ray Pulsar (AXP) 4U 0142+61 entered an active phase in 2006 March that lasted several months. During the active phase, several bursts were…
Red Noise in Anomalous X-ray Pulsar Timing Residuals
Anne M. Archibald, Rim Dib, Margaret A. Livingstone +1
Anomalous X-ray Pulsars (AXPs), thought to be magnetars, exhibit poorly understood deviations from a simple spin-down called "timing noise". AXP timing noise has strong low-frequen…
Local Void vs Dark Energy: Confrontation with WMAP and Type Ia Supernovae
Stephon Alexander, Tirthabir Biswas, Alessio Notari +1
It is now a known fact that if we happen to be living in the middle of a large underdense region, then we will observe an "apparent acceleration", even when any form of dark energy…
Observational Constraints on Theories with a Blue Spectrum of Tensor Modes
Andrew Stewart, Robert Brandenberger
Motivated by the string gas cosmological model, which predicts a blue tilt of the primordial gravitational wave spectrum, we examine the constraints imposed by current and planned…
40 Years of Pulsars: The Birth and Evolution of Isolated Radio Pulsars
C. -A. Faucher-Giguere, V. M. Kaspi
We investigate the birth and evolution of isolated radio pulsars using a population synthesis method, modeling the birth properties of the pulsars, their time evolution, and their…
Deep Optical Imaging of Starbursting "Transition" Dwarf Galaxies
Kate E. Dellenbusch, John S. Gallagher, Patricia M. Knezek +1
A subgroup of dwarf galaxies have characteristics of a possible evolutionary transition between star-forming systems and dwarf ellipticals. These systems host significant starburst…