Publications (22)
A NICER View of Spectral and Profile Evolution for Three X-ray Emitting Millisecond Pulsars
Dominick M. Rowan, Zaynab Ghazi, Lauren Lugo +17
We present two years of Neutron star Interior Composition Explorer (NICER) X-ray observations of three energetic rotation-powered millisecond pulsars (MSPs): PSRs B1937+21, B1821-2…
Constraining pulsar gap models with the light-curve and flux properties of the gamma-ray pulsar population
Marco Pierbattista, Isabelle Grenier, Alice Harding +1
We compare population synthesis results for inner and outer magnetosphere emission models with the various characteristics measured in the first LAT pulsar catalogue for both the r…
X-ray Polarization from Black Holes: GEMS Scientific White Paper
Jeremy Schnittman, Lorella Angelini, Matthew Baring +27
We present here a summary of the scientific goals behind the Gravity and Extreme Magnetism SMEX (GEMS) X-ray polarimetry mission's black hole (BH) observing program. The primary ta…
Chandra Phase-Resolved X-ray Spectroscopy of the Crab Pulsar II
Martin C. Weisskopf, Allyn F. Tennant, Dmitry G. Yakovlev +5
We present a new study of the X-ray spectral properties of the Crab Pulsar. The superb angular resolution of the Chandra X-ray Observatory enables distinguishing the pulsar from th…
Fermi/GBM Observations of SGR J0501+4516 Bursts
Lin Lin, Chryssa Kouveliotou, Matthew G. Baring +27
We present our temporal and spectral analyses of 29 bursts from SGR J0501+4516, detected with the Gamma-ray Burst Monitor onboard the Fermi Gamma-ray Space Telescope during the 13…
Pulsar Slot Gaps and Unidentified EGRET Sources
Alice Harding, Alexander Muslimov
A new picture of pulsar high-energy emission is proposed that is different from both the traditional polar cap and outer gap models, but combines elements of each. The slot gap mod…
Constraining pulsar gap models with light-curve shapes of a simulated gamma-ray pulsar population
Marco Pierbattista, Isabelle Grenier, Alice Harding +1
The Fermi Gamma-Ray Space Telescope has discovered many gamma-ray pulsars, both as radio-loud objects and radio-quiet or radio-weak pulsars that have been identified through blind…
Learning About the Magnetar Swift J1834.9-0846 from its Wind Nebula
Jonathan Granot, Ramandeep Gill, George Younes +4
The first wind nebula around a magnetar was recently discovered in X-rays around Swift~J1834.90846. We study this magnetar's global energetics and the properties of its particle…
White Paper on GEMS Study of Polarized X-rays from Neutron Stars
Pranab Ghosh, Lorella Angelini, Matthew Baring +27
We examine the expected X-ray polarization properties of neutron-star X-ray sources of various types, e.g., accretion and rotation powered pulsars, magnetars, and low-mass X-ray bi…
Toward a Realistic Pulsar Magnetosphere
Constantinos Kalapotharakos, Demosthenes Kazanas, Alice Harding +1
We present the magnetic and electric field structures as well as the currents and charge densities of pulsar magnetospheres which do not obey the ideal condition, ${\bf E \cdot B =…
VTXO: the Virtual Telescope for X-ray Observations
John Krizmanic, Neerav Shah, Alice Harding +12
The Virtual Telescope for X-ray Observations (VTXO) will use lightweight Phase Frensel Lenses (PFLs) in a virtual X-ray telescope with 1 km focal length and with nearly 50 milli-ar…
White Paper for Blazar Observations with a GEMS-like X-ray Polarimetry Mission
Henric Krawczynski, Lorella Angelini, Matthew Baring +27
In this document, we describe the scientific potential of blazar observations with a X-ray polarimetry mission like GEMS (Gravity and Extreme Magnetism SMEX). We describe five blaz…
Pioneering High-Speed Pulsar Parameter Estimation Using Convolutional Neural Networks
Greg Olmschenk, Emily Broadbent, Constantinos Kalapotharakos +5
Accurate thermal emission models of neutron stars are essential for constraining the dense matter equation of state. However, incorporating realistic magnetic field structures is c…
All-sky Medium Energy Gamma-ray Observatory: Exploring the Extreme Multimessenger Universe
Julie McEnery, Juan Abel Barrio, Ivan Agudo +182
The All-sky Medium Energy Gamma-ray Observatory (AMEGO) is a probe class mission concept that will provide essential contributions to multimessenger astrophysics in the late 2020s…
Extreme Astrophysics with Neutron Stars
Dong Lai, Marten van Kerkwijk, Jon Arons +11
We highlight recent theoretical and observational progress in several areas of neutron star astrophysics, and discuss the prospect for advances in the next decade.
Evidence for a Compact Object in the Aftermath of the Extra-Galactic Transient AT2018cow
Dheeraj R. Pasham, Wynn C. G. Ho, William Alston +16
The brightest Fast Blue Optical Transients (FBOTs) are mysterious extragalactic explosions that may represent a new class of astrophysical phenomena. Their fast time to maximum bri…
Electron positron pair flow and current composition in the pulsar magnetosphere
Gabriele Brambilla, Constantinos Kalapotharakos, Andrey Timokhin +2
We performed ab-initio Particle-In-Cell (PIC) simulations of a pulsar magnetosphere with electron-positron plasma produced only in the regions close to the neutron star surface. We…
Detailed Timing, Spectral, and Polarimetric Analysis of Magnetar 1RXS J170849.0-400910
Rachael Stewart, George Younes, Alice Harding +5
We present a broadband timing, spectral, and polarimetric study of the magnetar 1RXS~J170849.0-400910 using XMM-Newton, NuSTAR, and IXPE. The pulse morphology evolves strongly acro…
The Physics of Accretion Onto Highly Magnetized Neutron Stars
Michael T. Wolff, Peter A. Becker, Joel Coley +16
Studying the physical processes occurring in the region just above the magnetic poles of strongly magnetized, accreting binary neutron stars is essential to our understanding of st…
The Identification of the X-ray Counterpart to PSR J2021+4026
Martin C. Weisskopf, Roger W. Romani, Massimiliano Razzano +16
We report the probable identification of the X-ray counterpart to the gamma-ray pulsar PSR J2021+4026 using imaging with the Chandra X-ray Observatory ACIS and timing analysis with…
The Third Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
David A. Smith, Philippe Bruel, Colin J. Clark +156
We present 294 pulsars found in GeV data from the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. Another 33 millisecond pulsars (MSPs) discovered in deep radio…
The Sleeping Monster: NuSTAR observations of SGR 1806-20, 11 years after the Giant Flare
George Younes, Matthew G. Baring, Chryssa Kouveliotou +5
We report the analysis of 5 NuSTAR observations of SGR 1806-20 spread over a year from April 2015 to April 2016, more than 11 years following its Giant Flare (GF) of 2004. The sour…