Search Publications
Investigation of Energetic Particle Release Using Multi-point Imaging and In Situ Observations
Wang, Rui; Liu, Ying D.; Kwon, Ryun-Young +1 more
The solar eruption on 2012 January 27 resulted in a wide-spread solar energetic particle event observed by STEREO A and the near-Earth spacecraft (separated by 108°). The event was accompanied by an X-class flare, extreme-ultraviolet (EUV) wave and fast coronal mass ejection. We investigate the particle release by comparing the release times of pa…
The MAVERIC Survey: A Transitional Millisecond Pulsar Candidate in Terzan 5
Strader, Jay; Bahramian, Arash; Maccarone, Thomas J. +11 more
Transitional millisecond pulsars are accreting millisecond pulsars that switch between accreting X-ray binary and millisecond radio pulsar states. Only a handful of these objects have been identified so far. Terzan 5 CX1 is a variable hard-X-ray source in the globular cluster Terzan 5. In this paper, we identify a radio counterpart to CX1 in deep …
Violent Quenching: Molecular Gas Blown to 1000 km s-1 during a Major Merger
Moustakas, J.; Tremonti, C.; Yang, Yujin +7 more
We present Atacama Large Millimeter/submillimeter Array observations of a massive ({M}\star ≈ {10}11 {M}⊙ ) compact ({r}{{e},{UV}}≈ 100 pc) merger remnant at z = 0.66 that is driving a 1000 km s-1 outflow of cool gas, with no observational trace of an active galactic nucleus (AGN). We resolve …
Weakened Magnetization and Onset of Large-scale Turbulence in the Young Solar Wind—Comparisons of Remote Sensing Observations with Simulation
Parashar, Tulasi N.; Matthaeus, William H.; Goldstein, Melvyn L. +3 more
Recent analysis of Solar-Terrestrial Relations Observatory (STEREO) imaging observations have described the early stages of the development of turbulence in the young solar wind in solar minimum conditions. Here we extend this analysis to a global magnetohydrodynamic (MHD) simulation of the corona and solar wind based on inner boundary conditions,…
Identifying Observables That Can Differentiate Between Impulsive and Footpoint Heating: Time Lags and Intensity Ratios
Winebarger, Amy R.; Downs, Cooper; Mikić, Zoran +2 more
Observations of solar coronal loops have identified several common loop characteristics, including that loops appear to cool and have higher than expected densities. Two potential heating scenarios have been suggested to explain these observations. One scenario is that the loops are formed by many strands, each heated independently by a series of …
New Constraints on the Nature and Origin of the Leading Arm of the Magellanic Stream
Richter, Philipp; Lockman, Felix J.; Fox, Andrew J. +5 more
We present a new precision measurement of gas-phase abundances of S, O, N, Si, Fe, P, Al, Ca as well as molecular hydrogen (H2) in the Leading Arm (region II, LA II) of the Magellanic Stream (MS) toward the Seyfert galaxy NGC 3783. The results are based on high-quality archival ultraviolet/optical/radio data from various different instr…
Optical High-resolution Spectroscopy of 14 Young α-rich Stars
Ishigaki, Miho N.; Matsuno, Tadafumi; Yong, David +1 more
We report chemical abundances of 14 young α-rich stars including neutron-capture elements based on high-quality optical spectra from HIRES/Keck I and differential line-by-line analysis. From a comparison of the abundance patterns of young α-rich stars to those of nearby bright red giants with a similar metallicity range (-0.7 < [Fe/H] < -0.2…
Investigating Galactic Supernova Remnant Candidates Using LOFAR
Gelfand, Joseph D.; Vink, Jacco; Hessels, Jason W. T. +3 more
We investigate six supernova remnant (SNR) candidates—G51.21+0.11, G52.37-0.70, G53.07+0.49, G53.41+0.03, G53.84-0.75, and the possible shell around G54.1+0.3—in the Galactic plane using newly acquired Low-Frequency Array High-band Antenna observations, as well as archival Westerbork Synthesis Radio Telescope and Very Large Array Galactic Plane Su…
Observing and Modeling the Gamma-Ray Emission from Pulsar/Pulsar Wind Nebula Complex PSR J0205+6449/3C 58
Torres, Diego F.; Li, Jian; Kerr, Matthew +4 more
We present the results of the analysis of eight years of Fermi-LAT data of the pulsar/pulsar wind nebula complex PSR J0205+6449/3C 58. Using a contemporaneous ephemeris, we carried out a detailed analysis of PSR J0205+6449 both during its off-peak and on-peak phase intervals. 3C 58 is significantly detected during the off-peak phase interval. We s…
The X-Ray Luminosity Function of Ultraluminous X-Ray Sources in Collisional Ring Galaxies
Wolter, Anna; Mapelli, Michela; Fruscione, Antonella
Ring galaxies are fascinating laboratories: a catastrophic impact between two galaxies (one not much smaller than the other) has produced fireworks, especially in the larger one, when hit roughly perpendicularly to the plane. We analyze the point sources produced by the starburst episode following the impact in the rings of seven galaxies and dete…