Search Publications
X-Ray and GeV Gamma-Ray Variability of the Radio Galaxy NGC 1275
Fukazawa, Yasushi; Itoh, Ryosuke; Takahashi, Hiromitsu +6 more
We analyzed Suzaku/XIS data (2006-2015) and Fermi/LAT data (2008-2015) of the gamma-ray emitting radio galaxy NGC 1275. Correlated brightening of the nucleus in both the X-ray and GeV gamma-ray energy bands was found for the period 2013-2015. This is the first evidence of correlated variability between these two energy bands for NGC 1275. We also …
The KMOS Cluster Survey (KCS). II. The Effect of Environment on the Structural Properties of Massive Cluster Galaxies at Redshift 1.39 < z < 1.61
Bender, Ralf; Mendel, J. Trevor; Cappellari, Michele +12 more
We present results on the structural properties of massive passive galaxies in three clusters at 1.39 < z < 1.61 from the KMOS Cluster Survey. We measure light-weighted and mass-weighted sizes from optical and near-infrared Hubble Space Telescope imaging and spatially resolved stellar mass maps. The rest-frame R-band sizes of these galaxies …
Solar Coronal Jets Extending to High Altitudes Observed during the 2017 August 21 Total Eclipse
Hanaoka, Yoichiro; Nakazawa, Jun; Ohgoe, Osamu +11 more
Coronal jets, which extend from the solar surface to beyond 2 R ⊙, were observed in the polar coronal hole regions during the total solar eclipse on 2017 August 21. In a time-series of white-light images of the corona spanning 70 minutes taken with our multi-site observations of this eclipse, six jets were found as narrow structures upw…
Constraining Type Ia Supernova Progenitor Scenarios with Extremely Late-time Photometry of Supernova SN 2013aa
Kilpatrick, Charles D.; Foley, Ryan J.; Jacobson-Galán, Wynn V. +1 more
We present Hubble Space Telescope observations and photometric measurements of the Type Ia supernova (SN Ia) SN 2013aa 1500 days after explosion. At this epoch, the luminosity is primarily dictated by the amounts of radioactive {}57{{Co}} and {}55{{Fe}}, while at earlier epochs, the luminosity depends on the amount of radioac…
Constraints on the Location of γ-Ray Sample of Blazars with Radio Core-shift Measurements
Chen, Liang; Wu, Qingwen; Wu, Linhui +2 more
We model simultaneous or quasi-simultaneous multi-band spectral energy distributions (SEDs) for a sample of 25 blazars that have radio core-shift measurements, where a one-zone leptonic model and Markov chain Monte Carlo technique are adopted. In the SED fitting for 23 low-synchrotron-peaked (LSP) blazars, the seed photons from the broad-line (BLR…
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 …