61 citations · 285 across the 14 of their papers we have counts for
14 papers
Investigating the emission mechanism in the spatially-resolved jet of two z 3 radio-loud quasars
Jaya Maithil, Daniel A. Schwartz, Aneta Siemiginowska +9
This study focuses on high-redshift, z > 3, quasars where resolved X-ray jets remain underexplored in comparison to nearby sources. Building upon previous work, we identify and con…
Search for Extended GeV Sources in the Inner Galactic Plane
S. Abdollahi, F. Acero, A. Acharyya +108
The recent detection of extended -ray emission around middle-aged pulsars is interpreted as inverse-Compton scattering of ambient photons by electron-positron pairs escaping the…
Possible Gravitational Microlensing Events in the Optical Lightcurve of Active Galaxy S5 0716+714
D. Ł. Król, Ł. Stawarz, J. Krzesinski +1
A well-known active galaxy of the blazar type, S5 0716+714, is characterized by a particularly high variability duty cycle on short-time scales at optical frequencies. As such, the…
Fermi-LAT Gamma-ray Detection of the Recurrent Nova RS Ophiuchi during its 2021 Outburst
C. C. Cheung, T. J. Johnson, P. Jean +15
We report the Fermi-LAT gamma-ray detection of the 2021 outburst of the symbiotic recurrent nova RS Ophiuchi. In this system, unlike classical novae from cataclysmic binaries, the…
Glowbug, a Low-Cost, High-Sensitivity Gamma-Ray Burst Telescope
J. E. Grove, C. C. Cheung, M. Kerr +8
We describe Glowbug, a gamma-ray telescope for bursts and other transients in the 30 keV to 2 MeV band. It was recently selected for funding by the NASA Astrophysics Research and A…
VLA Observations of a Complete Sample of Radio Loud Quasars between redshifts 2.5 and 5.28: I. high-redshift sample summary and the radio images
Doug B. Gobeille, John F. C. Wardle, C. C. Cheung
We present high resolution (arcsecond or better) observations made with the Karl G. Jansky Very Large Array of 123 radio-loud quasars with redshifts in the range $2.5 \leq z \leq 5…
Fermi-LAT Detection of Gravitational Lens Delayed Gamma-ray Flares from Blazar B0218+357
C. C. Cheung, S. Larsson, J. D. Scargle +23
Using data from the Fermi Large Area Telescope (LAT), we report the first clear gamma-ray measurement of a delay between flares from the gravitationally lensed images of a blazar.…
Broadband Pulsations from PSR B1821-24: Implications for Emission Models and the Pulsar Population of M28
T. J. Johnson, L. Guillemot, M. Kerr +27
We report a 5.4σ detection of pulsed gamma rays from PSR B1821-24 in the globular cluster M28 using ~44 months of Fermi Large Area Telescope (LAT) data that have been reprocessed w…
The discovery of a population of gamma-ray novae
A. B. Hill, C. C. Cheung, P. Jean
Novae have long been expected to be sources of emission at several MeV from the decay of radioactive elements in the novae ejecta, however, they were not anticipated to be sources…
Fermi Discovers a New Population of Gamma-ray Novae
C. C. Cheung
Novae had not been widely considered as high-energy (>100 MeV) gamma-ray sources before the launch of the Fermi Large Area Telescope (LAT). In March 2010, the LAT made the first ga…
Chandra X-ray Observations of the Two Brightest Unidentified High Galactic Latitude Fermi-LAT gamma-ray Sources
C. C. Cheung, D. Donato, N. Gehrels +2
We present Chandra ACIS-I X-ray observations of 0FGL J1311.9-3419 and 0FGL J1653.4-0200, the two brightest high Galactic latitude (|b|>10 deg) gamma-ray sources from the 3 month Fe…
A Deep Chandra Observation of the X-shaped Radio Galaxy 4C +00.58: A Candidate for Merger-induced Reorientation?
Edmund J. Hodges-Kluck, Christopher S. Reynolds, M. Coleman Miller +1
Although rapid reorientation of a black hole spin axis (lasting less than a few Myr) has been suggested as a mechanism for the formation of wings in X-shaped radio galaxies (XRGs),…
The Chandra View of Nearby X-shaped Radio Galaxies
Edmund Hodges-Kluck, Christopher S. Reynolds, Chi C. Cheung +1
We present new and archival Chandra X-ray Observatory observations of X-shaped radio galaxies within z < 0.1 alongside a comparison sample of normal double-lobed FR I and II radio…
Polarimetry and the High-Energy Emission Mechanisms in Quasar Jets
M. Cara, E. S. Perlman, Y. Uchiyama +15
The emission mechanisms in extragalactic jets include synchrotron and various inverse-Compton processes. At low (radio through infrared) energies, it is widely agreed that synchrot…